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Analysis Report KOPEKER.exe

Overview

General Information

Sample Name:	KOPEKER.exe
Analysis ID:	392084
MD5:	cd885321b35b73421cd63e3150d677f7
SHA1:	2f09e0eb93927d82076f34549b0d4d3b7b393aab
SHA256:	495edfb60c0a9af0c57251ce28ca0bcf4c911324f59074f99c2797e36c3f3ef4
Infos:
Most interesting Screenshot:

Detection

GuLoader

Score:	100
Range:	0 - 100
Whitelisted:	false
Confidence:	100%

Signatures

Found malware configuration

Icon mismatch, binary includes an icon from a different legit application in order to fool users

Multi AV Scanner detection for submitted file

Yara detected GuLoader

C2 URLs / IPs found in malware configuration

Contains functionality to detect hardware virtualization (CPUID execution measurement)

Detected RDTSC dummy instruction sequence (likely for instruction hammering)

Found potential dummy code loops (likely to delay analysis)

Machine Learning detection for sample

Tries to detect sandboxes and other dynamic analysis tools (process name or module or function)

Tries to detect virtualization through RDTSC time measurements

Yara detected VB6 Downloader Generic

Abnormal high CPU Usage

Contains functionality for execution timing, often used to detect debuggers

Contains functionality to read the PEB

Detected potential crypto function

Found a high number of Window / User specific system calls (may be a loop to detect user behavior)

PE file contains an invalid checksum

PE file contains strange resources

Program does not show much activity (idle)

Sample file is different than original file name gathered from version info

Uses 32bit PE files

Uses code obfuscation techniques (call, push, ret)

Classification

Startup

System is w10x64

KOPEKER.exe (PID: 5760 cmdline: 'C:\Users\user\Desktop\KOPEKER.exe' MD5: CD885321B35B73421CD63E3150D677F7)

cleanup

Malware Configuration

Threatname: GuLoader

{"Payload URL": "https://drive.google.com/uc?export=download&id=13mbmc5DER0_wKkBDGQL230MFPs1cTVbi", "Injection Process": ["RegAsm.exe", "RegSvcs.exe", "MSBuild.exe"]}

Yara Overview

Memory Dumps

Source	Rule	Description	Author
00000000.00000002.985827741.0000000000620000.00000040.00000001.sdmp	JoeSecurity_GuLoader	Yara detected GuLoader	Joe Security
Process Memory Space: KOPEKER.exe PID: 5760	JoeSecurity_VB6DownloaderGeneric	Yara detected VB6 Downloader Generic	Joe Security
Process Memory Space: KOPEKER.exe PID: 5760	JoeSecurity_GuLoader	Yara detected GuLoader	Joe Security

Sigma Overview

No Sigma rule has matched

Signature Overview

Click to jump to signature section

Show All Signature Results

AV Detection:

Found malware configuration

Show sources

Source: 00000000.00000002.985827741.0000000000620000.00000040.00000001.sdmp

Malware Configuration Extractor: GuLoader {"Payload URL": "https://drive.google.com/uc?export=download&id=13mbmc5DER0_wKkBDGQL230MFPs1cTVbi", "Injection Process": ["RegAsm.exe", "RegSvcs.exe", "MSBuild.exe"]}

Multi AV Scanner detection for submitted file

Show sources

Source: KOPEKER.exe	Virustotal: Detection: 62%	Perma Link
Source: KOPEKER.exe	Metadefender: Detection: 32%	Perma Link
Source: KOPEKER.exe	ReversingLabs: Detection: 82%

Machine Learning detection for sample

Show sources

Source: KOPEKER.exe

Joe Sandbox ML: detected

Source: KOPEKER.exe

Static PE information: LOCAL_SYMS_STRIPPED, 32BIT_MACHINE, EXECUTABLE_IMAGE, LINE_NUMS_STRIPPED, RELOCS_STRIPPED

Networking:

C2 URLs / IPs found in malware configuration

Show sources

Source: Malware configuration extractor

URLs: https://drive.google.com/uc?export=download&id=13mbmc5DER0_wKkBDGQL230MFPs1cTVbi

Source: C:\Users\user\Desktop\KOPEKER.exe

Process Stats: CPU usage > 98%

Source: C:\Users\user\Desktop\KOPEKER.exe	Code function: 0_2_004096F2
Source: C:\Users\user\Desktop\KOPEKER.exe	Code function: 0_2_00409839
Source: C:\Users\user\Desktop\KOPEKER.exe	Code function: 0_2_004098C2
Source: C:\Users\user\Desktop\KOPEKER.exe	Code function: 0_2_0040A0E6
Source: C:\Users\user\Desktop\KOPEKER.exe	Code function: 0_2_0040A09B
Source: C:\Users\user\Desktop\KOPEKER.exe	Code function: 0_2_0040994E
Source: C:\Users\user\Desktop\KOPEKER.exe	Code function: 0_2_0040A17E
Source: C:\Users\user\Desktop\KOPEKER.exe	Code function: 0_2_004099E3
Source: C:\Users\user\Desktop\KOPEKER.exe	Code function: 0_2_00409A78
Source: C:\Users\user\Desktop\KOPEKER.exe	Code function: 0_2_0040A29C
Source: C:\Users\user\Desktop\KOPEKER.exe	Code function: 0_2_00409B1B
Source: C:\Users\user\Desktop\KOPEKER.exe	Code function: 0_2_0040A335
Source: C:\Users\user\Desktop\KOPEKER.exe	Code function: 0_2_0040E33C
Source: C:\Users\user\Desktop\KOPEKER.exe	Code function: 0_2_0040A3C6
Source: C:\Users\user\Desktop\KOPEKER.exe	Code function: 0_2_00409BAA
Source: C:\Users\user\Desktop\KOPEKER.exe	Code function: 0_2_0040A45A
Source: C:\Users\user\Desktop\KOPEKER.exe	Code function: 0_2_00409C39
Source: C:\Users\user\Desktop\KOPEKER.exe	Code function: 0_2_0040A4E5
Source: C:\Users\user\Desktop\KOPEKER.exe	Code function: 0_2_00409D71
Source: C:\Users\user\Desktop\KOPEKER.exe	Code function: 0_2_00409E98
Source: C:\Users\user\Desktop\KOPEKER.exe	Code function: 0_2_0040A749
Source: C:\Users\user\Desktop\KOPEKER.exe	Code function: 0_2_00409F28
Source: C:\Users\user\Desktop\KOPEKER.exe	Code function: 0_2_004097AA
Source: C:\Users\user\Desktop\KOPEKER.exe	Code function: 0_2_00409FB6

Source: KOPEKER.exe	Static PE information: Resource name: RT_ICON type: GLS_BINARY_LSB_FIRST
Source: KOPEKER.exe	Static PE information: Resource name: RT_ICON type: GLS_BINARY_LSB_FIRST

Source: KOPEKER.exe, 00000000.00000002.986561193.0000000002200000.00000002.00000001.sdmp	Binary or memory string: OriginalFilenameuser32j% vs KOPEKER.exe
Source: KOPEKER.exe, 00000000.00000002.1003029734.00000000050D0000.00000002.00000001.sdmp	Binary or memory string: OriginalFilenameSHELL32.DLL.MUIj% vs KOPEKER.exe

Source: KOPEKER.exe

Static PE information: LOCAL_SYMS_STRIPPED, 32BIT_MACHINE, EXECUTABLE_IMAGE, LINE_NUMS_STRIPPED, RELOCS_STRIPPED

Source: classification engine

Classification label: mal100.troj.evad.winEXE@1/0@0/0

Source: C:\Users\user\Desktop\KOPEKER.exe

File created: C:\Users\user\AppData\Local\Temp\~DF0ADD49C825BCA8F7.TMP

Jump to behavior

Source: KOPEKER.exe

Static PE information: Section: .text IMAGE_SCN_MEM_EXECUTE, IMAGE_SCN_CNT_CODE, IMAGE_SCN_MEM_READ

Source: C:\Users\user\Desktop\KOPEKER.exe

Section loaded: C:\Windows\SysWOW64\msvbvm60.dll

Source: C:\Users\user\Desktop\KOPEKER.exe

Key opened: HKEY_CURRENT_USER\Software\Policies\Microsoft\Windows\Safer\CodeIdentifiers

Source: KOPEKER.exe	Virustotal: Detection: 62%
Source: KOPEKER.exe	Metadefender: Detection: 32%
Source: KOPEKER.exe	ReversingLabs: Detection: 82%

Data Obfuscation:

Yara detected GuLoader

Show sources

Source: Yara match	File source: 00000000.00000002.985827741.0000000000620000.00000040.00000001.sdmp, type: MEMORY
Source: Yara match	File source: Process Memory Space: KOPEKER.exe PID: 5760, type: MEMORY

Yara detected VB6 Downloader Generic

Show sources

Source: Yara match

File source: Process Memory Space: KOPEKER.exe PID: 5760, type: MEMORY

Source: KOPEKER.exe

Static PE information: real checksum: 0x27f9e should be: 0x1d52b

Source: C:\Users\user\Desktop\KOPEKER.exe	Code function: 0_2_00408053 push 8EA106DEh; ret
Source: C:\Users\user\Desktop\KOPEKER.exe	Code function: 0_2_00405019 push FFFFFFF4h; retf
Source: C:\Users\user\Desktop\KOPEKER.exe	Code function: 0_2_0040C903 pushad ; ret
Source: C:\Users\user\Desktop\KOPEKER.exe	Code function: 0_2_0040C24B push 7600FFCEh; iretd
Source: C:\Users\user\Desktop\KOPEKER.exe	Code function: 0_2_0040445A push 0D010762h; retf
Source: C:\Users\user\Desktop\KOPEKER.exe	Code function: 0_2_00402F28 push 713A1CACh; retf
Source: C:\Users\user\Desktop\KOPEKER.exe	Code function: 0_2_00403789 push BB150FDEh; retf

Hooking and other Techniques for Hiding and Protection:

Icon mismatch, binary includes an icon from a different legit application in order to fool users

Show sources

Source: initial sample

Icon embedded in binary file: icon matches a legit application icon: download (71).png

Source: C:\Users\user\Desktop\KOPEKER.exe	Process information set: NOOPENFILEERRORBOX
Source: C:\Users\user\Desktop\KOPEKER.exe	Process information set: NOOPENFILEERRORBOX
Source: C:\Users\user\Desktop\KOPEKER.exe	Process information set: NOOPENFILEERRORBOX
Source: C:\Users\user\Desktop\KOPEKER.exe	Process information set: NOOPENFILEERRORBOX
Source: C:\Users\user\Desktop\KOPEKER.exe	Process information set: NOOPENFILEERRORBOX
Source: C:\Users\user\Desktop\KOPEKER.exe	Process information set: NOOPENFILEERRORBOX
Source: C:\Users\user\Desktop\KOPEKER.exe	Process information set: NOOPENFILEERRORBOX
Source: C:\Users\user\Desktop\KOPEKER.exe	Process information set: NOOPENFILEERRORBOX
Source: C:\Users\user\Desktop\KOPEKER.exe	Process information set: NOOPENFILEERRORBOX
Source: C:\Users\user\Desktop\KOPEKER.exe	Process information set: NOOPENFILEERRORBOX
Source: C:\Users\user\Desktop\KOPEKER.exe	Process information set: NOOPENFILEERRORBOX
Source: C:\Users\user\Desktop\KOPEKER.exe	Process information set: NOOPENFILEERRORBOX
Source: C:\Users\user\Desktop\KOPEKER.exe	Process information set: NOOPENFILEERRORBOX
Source: C:\Users\user\Desktop\KOPEKER.exe	Process information set: NOOPENFILEERRORBOX
Source: C:\Users\user\Desktop\KOPEKER.exe	Process information set: NOOPENFILEERRORBOX
Source: C:\Users\user\Desktop\KOPEKER.exe	Process information set: NOOPENFILEERRORBOX
Source: C:\Users\user\Desktop\KOPEKER.exe	Process information set: NOOPENFILEERRORBOX
Source: C:\Users\user\Desktop\KOPEKER.exe	Process information set: NOOPENFILEERRORBOX
Source: C:\Users\user\Desktop\KOPEKER.exe	Process information set: NOOPENFILEERRORBOX
Source: C:\Users\user\Desktop\KOPEKER.exe	Process information set: NOOPENFILEERRORBOX
Source: C:\Users\user\Desktop\KOPEKER.exe	Process information set: NOOPENFILEERRORBOX
Source: C:\Users\user\Desktop\KOPEKER.exe	Process information set: NOOPENFILEERRORBOX

Malware Analysis System Evasion:

Contains functionality to detect hardware virtualization (CPUID execution measurement)

Show sources

Source: C:\Users\user\Desktop\KOPEKER.exe	Code function: 0_2_00621226
Source: C:\Users\user\Desktop\KOPEKER.exe	Code function: 0_2_00627309
Source: C:\Users\user\Desktop\KOPEKER.exe	Code function: 0_2_0062266B
Source: C:\Users\user\Desktop\KOPEKER.exe	Code function: 0_2_006226AB
Source: C:\Users\user\Desktop\KOPEKER.exe	Code function: 0_2_00622733
Source: C:\Users\user\Desktop\KOPEKER.exe	Code function: 0_2_006227EB
Source: C:\Users\user\Desktop\KOPEKER.exe	Code function: 0_2_006227BE
Source: C:\Users\user\Desktop\KOPEKER.exe	Code function: 0_2_00622787
Source: C:\Users\user\Desktop\KOPEKER.exe	Code function: 0_2_00626843
Source: C:\Users\user\Desktop\KOPEKER.exe	Code function: 0_2_0062282E
Source: C:\Users\user\Desktop\KOPEKER.exe	Code function: 0_2_00626806
Source: C:\Users\user\Desktop\KOPEKER.exe	Code function: 0_2_00626804
Source: C:\Users\user\Desktop\KOPEKER.exe	Code function: 0_2_006248E3
Source: C:\Users\user\Desktop\KOPEKER.exe	Code function: 0_2_006248C3
Source: C:\Users\user\Desktop\KOPEKER.exe	Code function: 0_2_006268CF
Source: C:\Users\user\Desktop\KOPEKER.exe	Code function: 0_2_006248A7
Source: C:\Users\user\Desktop\KOPEKER.exe	Code function: 0_2_006228B7
Source: C:\Users\user\Desktop\KOPEKER.exe	Code function: 0_2_0062488B
Source: C:\Users\user\Desktop\KOPEKER.exe	Code function: 0_2_00626892
Source: C:\Users\user\Desktop\KOPEKER.exe	Code function: 0_2_00626966
Source: C:\Users\user\Desktop\KOPEKER.exe	Code function: 0_2_00626907
Source: C:\Users\user\Desktop\KOPEKER.exe	Code function: 0_2_0062290E
Source: C:\Users\user\Desktop\KOPEKER.exe	Code function: 0_2_0062690E
Source: C:\Users\user\Desktop\KOPEKER.exe	Code function: 0_2_006249E7
Source: C:\Users\user\Desktop\KOPEKER.exe	Code function: 0_2_006249C7
Source: C:\Users\user\Desktop\KOPEKER.exe	Code function: 0_2_00624992
Source: C:\Users\user\Desktop\KOPEKER.exe	Code function: 0_2_0062699F
Source: C:\Users\user\Desktop\KOPEKER.exe	Code function: 0_2_00624A2B
Source: C:\Users\user\Desktop\KOPEKER.exe	Code function: 0_2_00624A0B
Source: C:\Users\user\Desktop\KOPEKER.exe	Code function: 0_2_00621C82
Source: C:\Users\user\Desktop\KOPEKER.exe	Code function: 0_2_00625D75
Source: C:\Users\user\Desktop\KOPEKER.exe	Code function: 0_2_00625DAE
Source: C:\Users\user\Desktop\KOPEKER.exe	Code function: 0_2_00625D8B

Detected RDTSC dummy instruction sequence (likely for instruction hammering)

Show sources

Source: C:\Users\user\Desktop\KOPEKER.exe

RDTSC instruction interceptor: First address: 000000000062607D second address: 000000000062607D instructions:

Tries to detect sandboxes and other dynamic analysis tools (process name or module or function)

Show sources

Source: KOPEKER.exe

Binary or memory string: C:\PROGRAM FILES\QEMU-GA\QEMU-GA.EXE

Tries to detect virtualization through RDTSC time measurements

Show sources

Source: C:\Users\user\Desktop\KOPEKER.exe	RDTSC instruction interceptor: First address: 000000000040991D second address: 000000000040991D instructions: 0x00000000 rdtsc 0x00000002 cmp ebx, 00000085h 0x00000008 cmp ebx, 00000000h 0x0000000b cmp ebx, 0000009Ch 0x00000011 cmp eax, 10h 0x00000014 cmp ebx, 27h 0x00000017 cmp ebx, 24h 0x0000001a cmp ebx, 00000092h 0x00000020 fsubr st(5), st(0) 0x00000022 fldz 0x00000024 packuswb mm6, mm5 0x00000027 fldz 0x00000029 fxch st(0), st(1) 0x0000002b faddp st(1), st(0) 0x0000002d fpatan 0x0000002f jmp 00007F44BC95AAFEh 0x00000031 cmp ebx, 63h 0x00000034 cmp ebx, 000000C6h 0x0000003a cmp eax, 000000A7h 0x0000003f cmp edi, 02EAFF40h 0x00000045 movd mm1, ebx 0x00000048 movd mm1, ebx 0x0000004b movd mm1, ebx 0x0000004e movd mm1, ebx 0x00000051 fst st(4) 0x00000053 pslld mm5, 15h 0x00000057 fabs 0x00000059 psrlw mm4, A7h 0x0000005d fnclex 0x0000005f punpckhwd xmm4, xmm1 0x00000063 psubusb mm5, mm1 0x00000066 jmp 00007F44BC95AAF9h 0x00000068 jne 00007F44BC95A8F8h 0x0000006e inc edi 0x0000006f cmp ebx, 000000C2h 0x00000075 cmp eax, 00000099h 0x0000007a cmp ebx, 5Dh 0x0000007d cmp eax, 00000096h 0x00000082 cmp eax, 68h 0x00000085 cmp eax, 40h 0x00000088 psraw xmm7, xmm3 0x0000008c paddb xmm4, xmm5 0x00000090 ffree st(3) 0x00000092 psraw mm4, mm6 0x00000095 fninit 0x00000097 punpcklbw mm6, mm1 0x0000009a psubw xmm0, xmm1 0x0000009e jmp 00007F44BC95AAFDh 0x000000a0 rdtsc
Source: C:\Users\user\Desktop\KOPEKER.exe	RDTSC instruction interceptor: First address: 0000000000626071 second address: 000000000062607D instructions: 0x00000000 rdtsc 0x00000002 lfence 0x00000005 shl edx, 20h 0x00000008 or edx, eax 0x0000000a popad 0x0000000b pushad 0x0000000c rdtsc
Source: C:\Users\user\Desktop\KOPEKER.exe	RDTSC instruction interceptor: First address: 000000000062607D second address: 000000000062607D instructions:
Source: C:\Users\user\Desktop\KOPEKER.exe	RDTSC instruction interceptor: First address: 00000000006258C4 second address: 00000000006259C6 instructions: 0x00000000 rdtsc 0x00000002 lfence 0x00000005 shl edx, 20h 0x00000008 or edx, eax 0x0000000a popad 0x0000000b mov eax, dword ptr [ebp+04h] 0x0000000e jmp 00007F44BC95CB9Ah 0x00000010 cmp cl, dl 0x00000012 add eax, ebx 0x00000014 mov ecx, dword ptr [eax+18h] 0x00000017 jmp 00007F44BC95CB9Ah 0x00000019 cmp eax, 92C74976h 0x0000001e mov dword ptr [ebp+08h], ecx 0x00000021 mov ecx, dword ptr [eax+1Ch] 0x00000024 jmp 00007F44BC95CB9Ah 0x00000026 pushad 0x00000027 mov di, 847Ch 0x0000002b cmp di, 847Ch 0x00000030 jne 00007F44BC95C80Ch 0x00000036 popad 0x00000037 mov dword ptr [ebp+14h], ecx 0x0000003a mov ecx, dword ptr [eax+24h] 0x0000003d mov dword ptr [ebp+10h], ecx 0x00000040 jmp 00007F44BC95CB9Ah 0x00000042 cmp ecx, ecx 0x00000044 mov esi, dword ptr [eax+20h] 0x00000047 jmp 00007F44BC95CB9Ah 0x00000049 cmp ah, ch 0x0000004b add esi, dword ptr [ebp+04h] 0x0000004e xor ecx, ecx 0x00000050 jmp 00007F44BC95CB9Ah 0x00000052 cmp eax, edx 0x00000054 jmp 00007F44BC95CB9Ah 0x00000056 pushad 0x00000057 lfence 0x0000005a rdtsc
Source: C:\Users\user\Desktop\KOPEKER.exe	RDTSC instruction interceptor: First address: 00000000006257CD second address: 00000000006258C4 instructions: 0x00000000 rdtsc 0x00000002 lfence 0x00000005 shl edx, 20h 0x00000008 or edx, eax 0x0000000a popad 0x0000000b call 00007F44BC95AB2Bh 0x00000010 jmp 00007F44BC95AABAh 0x00000012 cmp ah, ch 0x00000014 mov dword ptr [ebp+04h], eax 0x00000017 jmp 00007F44BC95AABAh 0x00000019 cmp eax, edx 0x0000001b mov ebx, dword ptr [eax+3Ch] 0x0000001e add eax, ebx 0x00000020 mov ebx, dword ptr [eax+78h] 0x00000023 jmp 00007F44BC95AABAh 0x00000025 pushad 0x00000026 lfence 0x00000029 rdtsc

Source: C:\Users\user\Desktop\KOPEKER.exe

Code function: 0_2_004096F2 rdtsc

Source: C:\Users\user\Desktop\KOPEKER.exe	Window / User API: threadDelayed 1256
Source: C:\Users\user\Desktop\KOPEKER.exe	Window / User API: threadDelayed 8744

Source: all processes

Thread injection, dropped files, key value created, disk infection and DNS query: no activity detected

Source: KOPEKER.exe

Binary or memory string: C:\Program Files\Qemu-ga\qemu-ga.exe

Anti Debugging:

Found potential dummy code loops (likely to delay analysis)

Show sources

Source: C:\Users\user\Desktop\KOPEKER.exe

Process Stats: CPU usage > 90% for more than 60s

Source: C:\Users\user\Desktop\KOPEKER.exe

Code function: 0_2_004096F2 rdtsc

Source: C:\Users\user\Desktop\KOPEKER.exe	Code function: 0_2_006231CC mov eax, dword ptr fs:[00000030h]
Source: C:\Users\user\Desktop\KOPEKER.exe	Code function: 0_2_006222F6 mov eax, dword ptr fs:[00000030h]
Source: C:\Users\user\Desktop\KOPEKER.exe	Code function: 0_2_006222C7 mov eax, dword ptr fs:[00000030h]
Source: C:\Users\user\Desktop\KOPEKER.exe	Code function: 0_2_00622286 mov eax, dword ptr fs:[00000030h]
Source: C:\Users\user\Desktop\KOPEKER.exe	Code function: 0_2_00622295 mov eax, dword ptr fs:[00000030h]
Source: C:\Users\user\Desktop\KOPEKER.exe	Code function: 0_2_00625480 mov eax, dword ptr fs:[00000030h]
Source: C:\Users\user\Desktop\KOPEKER.exe	Code function: 0_2_00626843 mov eax, dword ptr fs:[00000030h]
Source: C:\Users\user\Desktop\KOPEKER.exe	Code function: 0_2_00626806 mov eax, dword ptr fs:[00000030h]
Source: C:\Users\user\Desktop\KOPEKER.exe	Code function: 0_2_00626804 mov eax, dword ptr fs:[00000030h]
Source: C:\Users\user\Desktop\KOPEKER.exe	Code function: 0_2_00621C82 mov eax, dword ptr fs:[00000030h]
Source: C:\Users\user\Desktop\KOPEKER.exe	Code function: 0_2_00625F2A mov eax, dword ptr fs:[00000030h]

Source: all processes

Thread injection, dropped files, key value created, disk infection and DNS query: no activity detected

Source: KOPEKER.exe, 00000000.00000002.986154636.0000000000D70000.00000002.00000001.sdmp	Binary or memory string: Shell_TrayWnd
Source: KOPEKER.exe, 00000000.00000002.986154636.0000000000D70000.00000002.00000001.sdmp	Binary or memory string: Progman
Source: KOPEKER.exe, 00000000.00000002.986154636.0000000000D70000.00000002.00000001.sdmp	Binary or memory string: &Program Manager
Source: KOPEKER.exe, 00000000.00000002.986154636.0000000000D70000.00000002.00000001.sdmp	Binary or memory string: Progmanlock

Mitre Att&ck Matrix

Initial Access	Execution	Persistence	Privilege Escalation	Defense Evasion	Credential Access	Discovery	Lateral Movement	Collection	Exfiltration	Command and Control	Network Effects	Remote Service Effects	Impact
Valid Accounts	Windows Management Instrumentation	Path Interception	Process Injection1	Masquerading1	OS Credential Dumping	Security Software Discovery511	Remote Services	Archive Collected Data1	Exfiltration Over Other Network Medium	Encrypted Channel1	Eavesdrop on Insecure Network Communication	Remotely Track Device Without Authorization	Modify System Partition
Default Accounts	Scheduled Task/Job	Boot or Logon Initialization Scripts	Boot or Logon Initialization Scripts	Virtualization/Sandbox Evasion11	LSASS Memory	Virtualization/Sandbox Evasion11	Remote Desktop Protocol	Data from Removable Media	Exfiltration Over Bluetooth	Application Layer Protocol1	Exploit SS7 to Redirect Phone Calls/SMS	Remotely Wipe Data Without Authorization	Device Lockout
Domain Accounts	At (Linux)	Logon Script (Windows)	Logon Script (Windows)	Process Injection1	Security Account Manager	Process Discovery1	SMB/Windows Admin Shares	Data from Network Shared Drive	Automated Exfiltration	Steganography	Exploit SS7 to Track Device Location	Obtain Device Cloud Backups	Delete Device Data
Local Accounts	At (Windows)	Logon Script (Mac)	Logon Script (Mac)	Obfuscated Files or Information1	NTDS	Application Window Discovery1	Distributed Component Object Model	Input Capture	Scheduled Transfer	Protocol Impersonation	SIM Card Swap		Carrier Billing Fraud
Cloud Accounts	Cron	Network Logon Script	Network Logon Script	Software Packing	LSA Secrets	System Information Discovery31	SSH	Keylogging	Data Transfer Size Limits	Fallback Channels	Manipulate Device Communication		Manipulate App Store Rankings or Ratings

Behavior Graph

Hide Legend

Legend:

Process
Signature
Created File
DNS/IP Info
Is Dropped
Is Windows Process
Number of created Registry Values
Number of created Files
Visual Basic
Delphi
Java
.Net C# or VB.NET
C, C++ or other language
Is malicious
Internet

Screenshots

Thumbnails

This section contains all screenshots as thumbnails, including those not shown in the slideshow.

Antivirus, Machine Learning and Genetic Malware Detection

Initial Sample

Source	Detection	Scanner	Label	Link
KOPEKER.exe	62%	Virustotal		Browse
KOPEKER.exe	38%	Metadefender		Browse
KOPEKER.exe	83%	ReversingLabs	Win32.Trojan.VBObfuse
KOPEKER.exe	100%	Joe Sandbox ML

Dropped Files

No Antivirus matches

Unpacked PE Files

No Antivirus matches

Domains

No Antivirus matches

URLs

No Antivirus matches

Domains and IPs

Contacted Domains

No contacted domains info

Contacted IPs

No contacted IP infos

General Information

Joe Sandbox Version:	31.0.0 Emerald
Analysis ID:	392084
Start date:	19.04.2021
Start time:	08:41:50
Joe Sandbox Product:	CloudBasic
Overall analysis duration:	0h 8m 40s
Hypervisor based Inspection enabled:	false
Report type:	light
Sample file name:	KOPEKER.exe
Cookbook file name:	default.jbs
Analysis system description:	Windows 10 64 bit v1803 with Office Professional Plus 2016, Chrome 85, IE 11, Adobe Reader DC 19, Java 8 Update 211
Number of analysed new started processes analysed:	11
Number of new started drivers analysed:	0
Number of existing processes analysed:	0
Number of existing drivers analysed:	0
Number of injected processes analysed:	0
Technologies:	HCA enabled EGA enabled HDC enabled AMSI enabled
Analysis Mode:	default
Analysis stop reason:	Timeout
Detection:	MAL
Classification:	mal100.troj.evad.winEXE@1/0@0/0
EGA Information:	Successful, ratio: 100%
HDC Information:	Successful, ratio: 9.4% (good quality ratio 3.7%) Quality average: 18.5% Quality standard deviation: 24%
HCA Information:	Failed
Cookbook Comments:	Adjust boot time Enable AMSI Found application associated with file extension: .exe
Warnings:	Show All Exclude process from analysis (whitelisted): MpCmdRun.exe, audiodg.exe, WMIADAP.exe, MusNotifyIcon.exe, conhost.exe, svchost.exe

Simulations

Behavior and APIs

No simulations

Joe Sandbox View / Context

IPs

No context

Domains

No context

ASN

No context

JA3 Fingerprints

No context

Dropped Files

No context

Created / dropped Files

No created / dropped files found

Static File Info

General
File type:	PE32 executable (GUI) Intel 80386, for MS Windows
Entropy (8bit):	5.7626204591873975
TrID:	Win32 Executable (generic) a (10002005/4) 99.15% Win32 Executable Microsoft Visual Basic 6 (82127/2) 0.81% Generic Win/DOS Executable (2004/3) 0.02% DOS Executable Generic (2002/1) 0.02% Autodesk FLIC Image File (extensions: flc, fli, cel) (7/3) 0.00%
File name:	KOPEKER.exe
File size:	118784
MD5:	cd885321b35b73421cd63e3150d677f7
SHA1:	2f09e0eb93927d82076f34549b0d4d3b7b393aab
SHA256:	495edfb60c0a9af0c57251ce28ca0bcf4c911324f59074f99c2797e36c3f3ef4
SHA512:	cf8124f2fb91027365cb2ed941b121698a40e5992935bc0b3b6bdd15ad92a417ad62bf247b643132d886145dfcc6c3a48b3ee52aaa6fd8577e4b37457cd83c81
SSDEEP:	1536:q28031a0rd/d7dGBWBWevDWoiLUaYuWMm2IPKtopQYXQHoH5encrFQLn9MamuSHi:qiFa0BGBWYeaoNHKtG+JMi
File Content Preview:	MZ......................@...............................................!..L.!This program cannot be run in DOS mode....$........#...B...B...B..L^...B...`...B...d...B..Rich.B..........PE..L......J.................p...`......h.............@................

File Icon


Icon Hash:	c0c6f2e0e4fefe3f

Static PE Info

General
Entrypoint:	0x401968
Entrypoint Section:	.text
Digitally signed:	false
Imagebase:	0x400000
Subsystem:	windows gui
Image File Characteristics:	LOCAL_SYMS_STRIPPED, 32BIT_MACHINE, EXECUTABLE_IMAGE, LINE_NUMS_STRIPPED, RELOCS_STRIPPED
DLL Characteristics:
Time Stamp:	0x4A88EC80 [Mon Aug 17 05:37:04 2009 UTC]
TLS Callbacks:
CLR (.Net) Version:
OS Version Major:	4
OS Version Minor:	0
File Version Major:	4
File Version Minor:	0
Subsystem Version Major:	4
Subsystem Version Minor:	0
Import Hash:	7677b40f5f8927412a58af017314f1ed

Entrypoint Preview

Instruction
push 0040F4D8h
call 00007F44BCECE623h
add byte ptr [eax], al
add byte ptr [eax], al
add byte ptr [eax], al
xor byte ptr [eax], al
add byte ptr [eax], al
inc eax
add byte ptr [eax], al
add byte ptr [eax], al
add byte ptr [eax], al
add byte ptr [ebx-604C4D3Dh], dl
cmp eax, 0B8E48E7h
imul edi, dword ptr [esi+3Dh], 00FB3ECEh
add byte ptr [eax], al
add byte ptr [eax], al
add byte ptr [ecx], al
add byte ptr [eax], al
add byte ptr [ecx+00h], al
push es
push eax
xchg eax, ebx
add ah, byte ptr [ecx+edi*2+72h]
imul esi, dword ptr [edx+65h], 64h
jnc 00007F44BCECE697h
outsb
add byte ptr [edx], ch
int1
add al, byte ptr [eax]
add byte ptr [eax], al
add bh, bh
int3
xor dword ptr [eax], eax
or al, 1Ah
wait
xor al, 5Ch
push edi
mov bp, seg?
inc eax
nop
xchg byte ptr [ebp-3Dh], bl
dec edi
loope 00007F44BCECE5DFh
jl 00007F44BCECE61Fh
xchg eax, edx
and eax, dword ptr [edx]
xor esp, eax
dec esi
lodsd
push edx
and ebx, dword ptr [edx]

Data Directories

Name	Virtual Address	Virtual Size	Is in Section
IMAGE_DIRECTORY_ENTRY_EXPORT	0x0	0x0
IMAGE_DIRECTORY_ENTRY_IMPORT	0x17764	0x28	.text
IMAGE_DIRECTORY_ENTRY_RESOURCE	0x1a000	0x3822	.rsrc
IMAGE_DIRECTORY_ENTRY_EXCEPTION	0x0	0x0
IMAGE_DIRECTORY_ENTRY_SECURITY	0x0	0x0
IMAGE_DIRECTORY_ENTRY_BASERELOC	0x0	0x0
IMAGE_DIRECTORY_ENTRY_DEBUG	0x0	0x0
IMAGE_DIRECTORY_ENTRY_COPYRIGHT	0x0	0x0
IMAGE_DIRECTORY_ENTRY_GLOBALPTR	0x0	0x0
IMAGE_DIRECTORY_ENTRY_TLS	0x0	0x0
IMAGE_DIRECTORY_ENTRY_LOAD_CONFIG	0x0	0x0
IMAGE_DIRECTORY_ENTRY_BOUND_IMPORT	0x228	0x20
IMAGE_DIRECTORY_ENTRY_IAT	0x1000	0x1a8	.text
IMAGE_DIRECTORY_ENTRY_DELAY_IMPORT	0x0	0x0
IMAGE_DIRECTORY_ENTRY_COM_DESCRIPTOR	0x0	0x0
IMAGE_DIRECTORY_ENTRY_RESERVED	0x0	0x0

Sections

Name	Virtual Address	Virtual Size	Raw Size	Xored PE	ZLIB Complexity	File Type	Entropy	Characteristics
.text	0x1000	0x16d48	0x17000	False	0.439017917799	data	6.15247427314	IMAGE_SCN_MEM_EXECUTE, IMAGE_SCN_CNT_CODE, IMAGE_SCN_MEM_READ
.data	0x18000	0x1260	0x1000	False	0.00634765625	data	0.0	IMAGE_SCN_CNT_INITIALIZED_DATA, IMAGE_SCN_MEM_WRITE, IMAGE_SCN_MEM_READ
.rsrc	0x1a000	0x3822	0x4000	False	0.4619140625	data	5.13551103483	IMAGE_SCN_CNT_INITIALIZED_DATA, IMAGE_SCN_MEM_READ

Resources

Name	RVA	Size	Type	Language	Country
RT_ICON	0x1cf7a	0x8a8	data
RT_ICON	0x1c8b2	0x6c8	data
RT_ICON	0x1c34a	0x568	GLS_BINARY_LSB_FIRST
RT_ICON	0x1b2a2	0x10a8	data
RT_ICON	0x1a91a	0x988	data
RT_ICON	0x1a4b2	0x468	GLS_BINARY_LSB_FIRST
RT_GROUP_ICON	0x1a458	0x5a	data
RT_VERSION	0x1a1e0	0x278	data	English	United States

Imports

DLL

Import

MSVBVM60.DLL

_CIcos, _adj_fptan, __vbaVarMove, __vbaFreeVar, __vbaLenBstr, __vbaStrVarMove, __vbaFreeVarList, __vbaEnd, _adj_fdiv_m64, __vbaFreeObjList, _adj_fprem1, __vbaSetSystemError, __vbaHresultCheckObj, __vbaLenBstrB, _adj_fdiv_m32, __vbaAryDestruct, __vbaOnError, __vbaObjSet, _adj_fdiv_m16i, __vbaObjSetAddref, _adj_fdivr_m16i, __vbaFpR8, __vbaVarTstLt, _CIsin, __vbaChkstk, EVENT_SINK_AddRef, __vbaStrCmp, __vbaObjVar, DllFunctionCall, _adj_fpatan, EVENT_SINK_Release, _CIsqrt, EVENT_SINK_QueryInterface, __vbaExceptHandler, _adj_fprem, _adj_fdivr_m64, __vbaFPException, __vbaStrVarVal, _CIlog, __vbaNew2, __vbaInStr, _adj_fdiv_m32i, _adj_fdivr_m32i, __vbaStrCopy, __vbaI4Str, __vbaFreeStrList, _adj_fdivr_m32, _adj_fdiv_r, __vbaVarTstNe, __vbaLateMemCall, __vbaVarAdd, __vbaStrToAnsi, __vbaVarDup, __vbaFpI4, __vbaLateMemCallLd, _CIatan, __vbaStrMove, _allmul, __vbaLateIdSt, _CItan, __vbaFPInt, _CIexp, __vbaFreeStr, __vbaFreeObj

Version Infos

Description	Data
Translation	0x0409 0x04b0
InternalName	KOPEKER
FileVersion	1.00
CompanyName	Cluster-C
Comments	Cluster-C
ProductName	Cluster-C
ProductVersion	1.00
FileDescription	Cluster-C
OriginalFilename	KOPEKER.exe

Possible Origin

Language of compilation system	Country where language is spoken	Map
English	United States

Network Behavior

No network behavior found

Code Manipulations

Statistics

System Behavior

Analysis Process: KOPEKER.exe PID: 5760 Parent PID: 5856

General

Start time:	08:42:44
Start date:	19/04/2021
Path:	C:\Users\user\Desktop\KOPEKER.exe
Wow64 process (32bit):	true
Commandline:	'C:\Users\user\Desktop\KOPEKER.exe'
Imagebase:	0x400000
File size:	118784 bytes
MD5 hash:	CD885321B35B73421CD63E3150D677F7
Has elevated privileges:	true
Has administrator privileges:	true
Programmed in:	Visual Basic
Yara matches:	Rule: JoeSecurity_GuLoader, Description: Yara detected GuLoader, Source: 00000000.00000002.985827741.0000000000620000.00000040.00000001.sdmp, Author: Joe Security
Reputation:	low

Disassembly

Code Analysis

Reset < >

Description:	Adversaries may inject code into processes in order to evade process-based defenses as well as possibly elevate privileges. Process injection is a method of executing arbitrary code in the address space of a separate live process. Running code in the context of another process may allow access to the process's memory, system/network resources, and possibly elevated privileges. Execution via process injection may also evade detection from security products since the execution is masked under a legitimate process.
Tactics:	Defense Evasion, Privilege Escalation
Data Sources:	API monitoring, DLL monitoring, File monitoring, Named Pipes, Process monitoring
Platforms:	Linux, macOS, Windows
Url:	Open detailed description by Mitre

Description:	Adversaries may attempt to manipulate features of their artifacts to make them appear legitimate or benign to users and/or security tools. Masquerading occurs when the name or location of an object, legitimate or malicious, is manipulated or abused for the sake of evading defenses and observation. This may include manipulating file metadata, tricking users into misidentifying the file type, and giving legitimate task or service names.
Tactics:	Defense Evasion
Data Sources:	Binary file metadata, File monitoring, Process command-line parameters, Process monitoring
Platforms:	Linux, macOS, Windows
Url:	Open detailed description by Mitre

Description:	Adversaries may employ various means to detect and avoid virtualization and analysis environments. This may include changing behaviors based on the results of checks for the presence of artifacts indicative of a virtual machine environment (VME) or sandbox. If the adversary detects a VME, they may alter their malware to disengage from the victim or conceal the core functions of the implant. They may also search for VME artifacts before dropping secondary or additional payloads. Adversaries may use the information learned from [Virtualization/Sandbox Evasion](https://attack.mitre.org/techniques/T1497) during automated discovery to shape follow-on behaviors.
Tactics:	Defense Evasion, Discovery
Data Sources:	Process command-line parameters, Process monitoring
Platforms:	Linux, macOS, Windows
Url:	Open detailed description by Mitre

Description:	Adversaries may attempt to make an executable or file difficult to discover or analyze by encrypting, encoding, or otherwise obfuscating its contents on the system or in transit. This is common behavior that can be used across different platforms and the network to evade defenses.
Tactics:	Defense Evasion
Data Sources:	Binary file metadata, Email gateway, Environment variable, File monitoring, Malware reverse engineering, Network intrusion detection system, Network protocol analysis, Process command-line parameters, Process monitoring, Process use of network, SSL/TLS inspection, Windows event logs
Platforms:	Linux, macOS, Windows
Url:	Open detailed description by Mitre

Description:	Adversaries may attempt to get a listing of security software, configurations, defensive tools, and sensors that are installed on a system or in a cloud environment. This may include things such as firewall rules and anti-virus. Adversaries may use the information from Security Software Discovery during automated discovery to shape follow-on behaviors, including whether or not the adversary fully infects the target and/or attempts specific actions.
Tactics:	Discovery
Data Sources:	AWS CloudTrail logs, Azure activity logs, File monitoring, Process command-line parameters, Process monitoring, Stackdriver logs
Platforms:	AWS, Azure, Azure AD, GCP, Linux, macOS, Office 365, SaaS, Windows
Url:	Open detailed description by Mitre

Description:	Adversaries may attempt to get information about running processes on a system. Information obtained could be used to gain an understanding of common software/applications running on systems within the network. Adversaries may use the information from Process Discovery during automated discovery to shape follow-on behaviors, including whether or not the adversary fully infects the target and/or attempts specific actions.
Tactics:	Discovery
Data Sources:	API monitoring, Process command-line parameters, Process monitoring
Platforms:	Linux, macOS, Windows
Url:	Open detailed description by Mitre

Description:	An adversary may attempt to get detailed information about the operating system and hardware, including version, patches, hotfixes, service packs, and architecture. Adversaries may use the information from System Information Discovery during automated discovery to shape follow-on behaviors, including whether or not the adversary fully infects the target and/or attempts specific actions.
Tactics:	Discovery
Data Sources:	AWS CloudTrail logs, Azure activity logs, Process command-line parameters, Process monitoring, Stackdriver logs
Platforms:	AWS, Azure, GCP, Linux, macOS, Windows
Url:	Open detailed description by Mitre

Description:	An adversary may compress and/or encrypt data that is collected prior to exfiltration. Compressing the data can help to obfuscate the collected data and minimize the amount of data sent over the network. Encryption can be used to hide information that is being exfiltrated from detection or make exfiltration less conspicuous upon inspection by a defender.
Tactics:	Collection
Data Sources:	Binary file metadata, File monitoring, Process command-line parameters, Process monitoring
Platforms:	Linux, macOS, Windows
Url:	Open detailed description by Mitre

Description:	Adversaries may employ a known encryption algorithm to conceal command and control traffic rather than relying on any inherent protections provided by a communication protocol. Despite the use of a secure algorithm, these implementations may be vulnerable to reverse engineering if secret keys are encoded and/or generated within malware samples/configuration files.
Tactics:	Command and Control
Data Sources:	Malware reverse engineering, Netflow/Enclave netflow, Packet capture, Process monitoring, Process use of network, SSL/TLS inspection
Platforms:	Linux, macOS, Windows
Url:	Open detailed description by Mitre

Description:	Adversaries may communicate using application layer protocols to avoid detection/network filtering by blending in with existing traffic. Commands to the remote system, and often the results of those commands, will be embedded within the protocol traffic between the client and server.
Tactics:	Command and Control
Data Sources:	DNS records, Netflow/Enclave netflow, Network protocol analysis, Packet capture, Process monitoring, Process use of network
Platforms:	Linux, macOS, Windows
Url:	Open detailed description by Mitre

Behavior Section

Behavior Chronological

Disassembly

Uncategorized

Graph

Loading ...

Warning!

Analysis Report KOPEKER.exe

Overview

General Information

Detection

Signatures

Classification

Startup

Malware Configuration

Threatname: GuLoader

Yara Overview

Memory Dumps

Sigma Overview

Signature Overview

AV Detection:

Compliance:

Networking:

System Summary:

Data Obfuscation:

Hooking and other Techniques for Hiding and Protection:

Malware Analysis System Evasion:

Anti Debugging:

HIPS / PFW / Operating System Protection Evasion:

Mitre Att&ck Matrix

Behavior Graph

Screenshots

Thumbnails

Antivirus, Machine Learning and Genetic Malware Detection

Initial Sample

Dropped Files

Unpacked PE Files

Domains

URLs

Domains and IPs

Contacted Domains

Contacted IPs

General Information

Simulations

Behavior and APIs

Joe Sandbox View / Context

IPs

Domains

ASN

JA3 Fingerprints

Dropped Files

Created / dropped Files

Static File Info

General

File Icon

Static PE Info

General

Entrypoint Preview

Data Directories

Sections

Resources

Imports

Version Infos

Possible Origin

Network Behavior

Code Manipulations

Statistics

System Behavior

Analysis Process: KOPEKER.exe PID: 5760 Parent PID: 5856

General

Disassembly

Code Analysis