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Windows Analysis Report PO#578946.exe

Overview

General Information

Sample Name:	PO#578946.exe
Analysis ID:	457760
MD5:	691bde1d30c382256ff1072b8f305841
SHA1:	1ce839f49da7750ab19f0e709747a36dce1933fc
SHA256:	9d1bfddea6c5c0a596af58ed64e6c38d2a274e507ca8d92d8fc801e3d8878cca
Tags:	exeGuLoader
Infos:
Most interesting Screenshot:

Detection

GuLoader

Score:	96
Range:	0 - 100
Whitelisted:	false
Confidence:	100%

Signatures

Antivirus / Scanner detection for submitted sample

Found malware configuration

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)

Initial sample is a PE file and has a suspicious name

Tries to detect virtualization through RDTSC time measurements

Abnormal high CPU Usage

Contains functionality for execution timing, often used to detect debuggers

Contains functionality to call native functions

Contains functionality to query CPU information (cpuid)

Contains functionality to read the PEB

Detected potential crypto function

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

Process Tree

System is w10x64

PO#578946.exe (PID: 4828 cmdline: 'C:\Users\user\Desktop\PO#578946.exe' MD5: 691BDE1D30C382256FF1072B8F305841)

cleanup

Malware Configuration

Threatname: GuLoader

{"Payload URL": "https://drive.google.com/uc?export=download&id=1_XiRU-Ribfen&"}

Yara Overview

Memory Dumps

Source	Rule	Description	Author	Strings
00000000.00000002.868117942.0000000002420000.00000040.00000001.sdmp	JoeSecurity_GuLoader_2	Yara detected GuLoader	Joe Security

Sigma Overview

No Sigma rule has matched

Jbx Signature Overview

Click to jump to signature section

Show All Signature Results

AV Detection:

Antivirus / Scanner detection for submitted sample

Show sources

Source: PO#578946.exe

Avira: detected

Found malware configuration

Show sources

Source: 00000000.00000002.868117942.0000000002420000.00000040.00000001.sdmp

Malware Configuration Extractor: GuLoader {"Payload URL": "https://drive.google.com/uc?export=download&id=1_XiRU-Ribfen&"}

Multi AV Scanner detection for submitted file

Show sources

Source: PO#578946.exe	Virustotal: Detection: 56%			Perma Link
Source: PO#578946.exe	ReversingLabs: Detection: 34%

Source: PO#578946.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=1_XiRU-Ribfen&

System Summary:

Initial sample is a PE file and has a suspicious name

Show sources

Source: initial sample

Static PE information: Filename: PO#578946.exe

Source: C:\Users\user\Desktop\PO#578946.exe

Process Stats: CPU usage > 98%

Source: C:\Users\user\Desktop\PO#578946.exe

Code function: 0_2_024268DE NtAllocateVirtualMemory,

Source: C:\Users\user\Desktop\PO#578946.exe	Code function: 0_2_024268DE
Source: C:\Users\user\Desktop\PO#578946.exe	Code function: 0_2_02424A49
Source: C:\Users\user\Desktop\PO#578946.exe	Code function: 0_2_0242A250
Source: C:\Users\user\Desktop\PO#578946.exe	Code function: 0_2_02424625
Source: C:\Users\user\Desktop\PO#578946.exe	Code function: 0_2_02424633
Source: C:\Users\user\Desktop\PO#578946.exe	Code function: 0_2_02426236
Source: C:\Users\user\Desktop\PO#578946.exe	Code function: 0_2_02425234
Source: C:\Users\user\Desktop\PO#578946.exe	Code function: 0_2_02423E3A
Source: C:\Users\user\Desktop\PO#578946.exe	Code function: 0_2_024232CA
Source: C:\Users\user\Desktop\PO#578946.exe	Code function: 0_2_02422ED7
Source: C:\Users\user\Desktop\PO#578946.exe	Code function: 0_2_02424AF4
Source: C:\Users\user\Desktop\PO#578946.exe	Code function: 0_2_02429E9A
Source: C:\Users\user\Desktop\PO#578946.exe	Code function: 0_2_02424EB4
Source: C:\Users\user\Desktop\PO#578946.exe	Code function: 0_2_02428764
Source: C:\Users\user\Desktop\PO#578946.exe	Code function: 0_2_02429F6E
Source: C:\Users\user\Desktop\PO#578946.exe	Code function: 0_2_02422F7C
Source: C:\Users\user\Desktop\PO#578946.exe	Code function: 0_2_02424F17
Source: C:\Users\user\Desktop\PO#578946.exe	Code function: 0_2_02424723
Source: C:\Users\user\Desktop\PO#578946.exe	Code function: 0_2_02424F28
Source: C:\Users\user\Desktop\PO#578946.exe	Code function: 0_2_024217CC
Source: C:\Users\user\Desktop\PO#578946.exe	Code function: 0_2_02424FE4
Source: C:\Users\user\Desktop\PO#578946.exe	Code function: 0_2_024233FF
Source: C:\Users\user\Desktop\PO#578946.exe	Code function: 0_2_02422B82
Source: C:\Users\user\Desktop\PO#578946.exe	Code function: 0_2_02421785
Source: C:\Users\user\Desktop\PO#578946.exe	Code function: 0_2_0242538A
Source: C:\Users\user\Desktop\PO#578946.exe	Code function: 0_2_02424B8B
Source: C:\Users\user\Desktop\PO#578946.exe	Code function: 0_2_02424790
Source: C:\Users\user\Desktop\PO#578946.exe	Code function: 0_2_02422BB8
Source: C:\Users\user\Desktop\PO#578946.exe	Code function: 0_2_02422C53
Source: C:\Users\user\Desktop\PO#578946.exe	Code function: 0_2_0242A060
Source: C:\Users\user\Desktop\PO#578946.exe	Code function: 0_2_02428400
Source: C:\Users\user\Desktop\PO#578946.exe	Code function: 0_2_024248CE
Source: C:\Users\user\Desktop\PO#578946.exe	Code function: 0_2_02424C8D
Source: C:\Users\user\Desktop\PO#578946.exe	Code function: 0_2_0242A499
Source: C:\Users\user\Desktop\PO#578946.exe	Code function: 0_2_02422CB1
Source: C:\Users\user\Desktop\PO#578946.exe	Code function: 0_2_0242414E
Source: C:\Users\user\Desktop\PO#578946.exe	Code function: 0_2_02424D60
Source: C:\Users\user\Desktop\PO#578946.exe	Code function: 0_2_0242316F
Source: C:\Users\user\Desktop\PO#578946.exe	Code function: 0_2_02429D6D
Source: C:\Users\user\Desktop\PO#578946.exe	Code function: 0_2_02425118
Source: C:\Users\user\Desktop\PO#578946.exe	Code function: 0_2_02423534
Source: C:\Users\user\Desktop\PO#578946.exe	Code function: 0_2_02423DC1
Source: C:\Users\user\Desktop\PO#578946.exe	Code function: 0_2_0242A1E2
Source: C:\Users\user\Desktop\PO#578946.exe	Code function: 0_2_02422DE0
Source: C:\Users\user\Desktop\PO#578946.exe	Code function: 0_2_024245FC
Source: C:\Users\user\Desktop\PO#578946.exe	Code function: 0_2_0242318A
Source: C:\Users\user\Desktop\PO#578946.exe	Code function: 0_2_02424190
Source: C:\Users\user\Desktop\PO#578946.exe	Code function: 0_2_02429DA0

Source: PO#578946.exe, 00000000.00000000.335853401.0000000000418000.00000002.00020000.sdmp	Binary or memory string: OriginalFilenameUnderno3.exe vs PO#578946.exe
Source: PO#578946.exe, 00000000.00000002.868019534.00000000022D0000.00000002.00000001.sdmp	Binary or memory string: OriginalFilenameuser32j% vs PO#578946.exe
Source: PO#578946.exe	Binary or memory string: OriginalFilenameUnderno3.exe vs PO#578946.exe

Source: PO#578946.exe

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

Source: classification engine

Classification label: mal96.troj.evad.winEXE@1/0@0/0

Source: C:\Users\user\Desktop\PO#578946.exe

File created: C:\Users\user\AppData\Local\Temp\~DF5AAF62D8F409C8D0.TMP

Jump to behavior

Source: PO#578946.exe

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

Source: C:\Users\user\Desktop\PO#578946.exe

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

Source: C:\Users\user\Desktop\PO#578946.exe

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

Source: PO#578946.exe	Virustotal: Detection: 56%
Source: PO#578946.exe	ReversingLabs: Detection: 34%

Data Obfuscation:

Yara detected GuLoader

Show sources

Source: Yara match

File source: 00000000.00000002.868117942.0000000002420000.00000040.00000001.sdmp, type: MEMORY

Source: C:\Users\user\Desktop\PO#578946.exe	Code function: 0_2_00408EF8 pushad ; ret
Source: C:\Users\user\Desktop\PO#578946.exe	Code function: 0_2_0040953E push eax; iretd
Source: C:\Users\user\Desktop\PO#578946.exe	Code function: 0_2_02426E62 pushad ; retf
Source: C:\Users\user\Desktop\PO#578946.exe	Code function: 0_2_02420AF1 push esp; retf
Source: C:\Users\user\Desktop\PO#578946.exe	Code function: 0_2_02420B18 push esp; retf
Source: C:\Users\user\Desktop\PO#578946.exe	Code function: 0_2_02426F1E pushad ; retf
Source: C:\Users\user\Desktop\PO#578946.exe	Code function: 0_2_02427BF7 push esp; ret
Source: C:\Users\user\Desktop\PO#578946.exe	Code function: 0_2_0242784E pushad ; retf
Source: C:\Users\user\Desktop\PO#578946.exe	Code function: 0_2_02427866 pushad ; retf
Source: C:\Users\user\Desktop\PO#578946.exe	Code function: 0_2_02426DC4 pushad ; retf

Source: C:\Users\user\Desktop\PO#578946.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\PO#578946.exe

Code function: 0_2_0242316F

Detected RDTSC dummy instruction sequence (likely for instruction hammering)

Show sources

Source: C:\Users\user\Desktop\PO#578946.exe

RDTSC instruction interceptor: First address: 000000000242034B second address: 000000000242034B instructions:

Tries to detect virtualization through RDTSC time measurements

Show sources

Source: C:\Users\user\Desktop\PO#578946.exe	RDTSC instruction interceptor: First address: 000000000242034B second address: 000000000242034B instructions:
Source: C:\Users\user\Desktop\PO#578946.exe	RDTSC instruction interceptor: First address: 0000000002426191 second address: 0000000002426191 instructions: 0x00000000 rdtsc 0x00000002 mov eax, CFC9D9CCh 0x00000007 xor eax, E7B8D616h 0x0000000c xor eax, B003C39Fh 0x00000011 xor eax, 9872CC44h 0x00000016 cpuid 0x00000018 popad 0x00000019 call 00007FEE848CB84Ah 0x0000001e lfence 0x00000021 mov edx, 324626BAh 0x00000026 xor edx, 8E47B5F1h 0x0000002c xor edx, CD58843Fh 0x00000032 xor edx, 0EA71760h 0x00000038 mov edx, dword ptr [edx] 0x0000003a lfence 0x0000003d ret 0x0000003e sub edx, esi 0x00000040 ret 0x00000041 pop ecx 0x00000042 cmp cx, dx 0x00000045 add edi, edx 0x00000047 dec ecx 0x00000048 mov dword ptr [ebp+000001B1h], ecx 0x0000004e mov ecx, 1C5A7D24h 0x00000053 xor ecx, 8E853080h 0x00000059 cmp cx, cx 0x0000005c xor ecx, 6F6EDF25h 0x00000062 test ax, dx 0x00000065 sub ecx, FDB19281h 0x0000006b cmp dword ptr [ebp+000001B1h], ecx 0x00000071 mov ecx, dword ptr [ebp+000001B1h] 0x00000077 jne 00007FEE848CB7F4h 0x00000079 cmp edx, eax 0x0000007b mov dword ptr [ebp+00000221h], eax 0x00000081 mov eax, ecx 0x00000083 push eax 0x00000084 mov eax, dword ptr [ebp+00000221h] 0x0000008a call 00007FEE848CB910h 0x0000008f call 00007FEE848CB86Bh 0x00000094 lfence 0x00000097 mov edx, 324626BAh 0x0000009c xor edx, 8E47B5F1h 0x000000a2 xor edx, CD58843Fh 0x000000a8 xor edx, 0EA71760h 0x000000ae mov edx, dword ptr [edx] 0x000000b0 lfence 0x000000b3 ret 0x000000b4 mov esi, edx 0x000000b6 pushad 0x000000b7 rdtsc

Source: C:\Users\user\Desktop\PO#578946.exe

Code function: 0_2_02424A49 rdtsc

Source: all processes

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

Anti Debugging:

Found potential dummy code loops (likely to delay analysis)

Show sources

Source: C:\Users\user\Desktop\PO#578946.exe

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

Source: C:\Users\user\Desktop\PO#578946.exe

Code function: 0_2_02424A49 rdtsc

Source: C:\Users\user\Desktop\PO#578946.exe	Code function: 0_2_02425FBD mov eax, dword ptr fs:[00000030h]
Source: C:\Users\user\Desktop\PO#578946.exe	Code function: 0_2_02428C43 mov eax, dword ptr fs:[00000030h]
Source: C:\Users\user\Desktop\PO#578946.exe	Code function: 0_2_0242914F mov eax, dword ptr fs:[00000030h]
Source: C:\Users\user\Desktop\PO#578946.exe	Code function: 0_2_0242316F mov eax, dword ptr fs:[00000030h]
Source: C:\Users\user\Desktop\PO#578946.exe	Code function: 0_2_02429D6D mov eax, dword ptr fs:[00000030h]
Source: C:\Users\user\Desktop\PO#578946.exe	Code function: 0_2_02423DC1 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: PO#578946.exe, 00000000.00000002.867875316.0000000000DA0000.00000002.00000001.sdmp	Binary or memory string: Shell_TrayWnd
Source: PO#578946.exe, 00000000.00000002.867875316.0000000000DA0000.00000002.00000001.sdmp	Binary or memory string: Progman
Source: PO#578946.exe, 00000000.00000002.867875316.0000000000DA0000.00000002.00000001.sdmp	Binary or memory string: &Program Manager
Source: PO#578946.exe, 00000000.00000002.867875316.0000000000DA0000.00000002.00000001.sdmp	Binary or memory string: Progmanlock

Source: C:\Users\user\Desktop\PO#578946.exe

Code function: 0_2_02425B4B cpuid

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	Virtualization/Sandbox Evasion11	OS Credential Dumping	Security Software Discovery41	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	Process Injection1	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)	Obfuscated Files or Information1	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)	Binary Padding	NTDS	System Information Discovery311	Distributed Component Object Model	Input Capture	Scheduled Transfer	Protocol Impersonation	SIM Card Swap		Carrier Billing Fraud

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
PO#578946.exe	57%	Virustotal		Browse
PO#578946.exe	35%	ReversingLabs	Win32.Trojan.Fragtor
PO#578946.exe	100%	Avira	HEUR/AGEN.1130122

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:	33.0.0 White Diamond
Analysis ID:	457760
Start date:	02.08.2021
Start time:	09:26:03
Joe Sandbox Product:	CloudBasic
Overall analysis duration:	0h 7m 42s
Hypervisor based Inspection enabled:	false
Report type:	light
Sample file name:	PO#578946.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:	18
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:	mal96.troj.evad.winEXE@1/0@0/0
EGA Information:	Failed
HDC Information:	Successful, ratio: 1.1% (good quality ratio 0.2%) Quality average: 17.4% Quality standard deviation: 34.8%
HCA Information:	Failed
Cookbook Comments:	Adjust boot time Enable AMSI Found application associated with file extension: .exe Override analysis time to 240s for sample files taking high CPU consumption
Warnings:	Show All Exclude process from analysis (whitelisted): MpCmdRun.exe, audiodg.exe, BackgroundTransferHost.exe, WMIADAP.exe, backgroundTaskHost.exe, conhost.exe, svchost.exe, wuapihost.exe Not all processes where analyzed, report is missing behavior information

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):	6.304822927566701
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:	PO#578946.exe
File size:	98304
MD5:	691bde1d30c382256ff1072b8f305841
SHA1:	1ce839f49da7750ab19f0e709747a36dce1933fc
SHA256:	9d1bfddea6c5c0a596af58ed64e6c38d2a274e507ca8d92d8fc801e3d8878cca
SHA512:	b8eba412543f38959d50279654d72be9f208e45d7fca1023aa07baf75c328d7bf7aba2cbd8a1a9761f6ae1942fcea0f6e593ea1ec2c74d7f941ac734a046ee3c
SSDEEP:	1536:9xnKKKKKKKKKKKKKKKKKKKKKKKKKKKKCKKKKKKKKKKKKKKKKKKKKKKKKKKKKKDKs:oauQiP2d+a
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...[..Z.................P...0...............`....@................

File Icon


Icon Hash:	c4e8c8cccce0e8e8

Static PE Info

General
Entrypoint:	0x4012bc
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:	0x5A01D35B [Tue Nov 7 15:38:03 2017 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:	6859d1daf1cf351f8ea3b0beb22606a9

Entrypoint Preview

Instruction
push 00401CB0h
call 00007FEE84943933h
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 [eax-72h], ch
sub eax, BF76FBCFh
inc eax
mov al, byte ptr [82068D03h]
jmp 00007FEE849439AAh
add eax, dword ptr [eax]
add byte ptr [eax], al
add byte ptr [eax], al
add byte ptr [ecx], al
add byte ptr [eax], al
add byte ptr [eax], al
add al, ah
or dword ptr [ebx+eax], 44h
outsd
outsb
popad
je 00007FEE849439B1h
jc 00007FEE849439A7h
outsb
je 00007FEE849439A3h
outsb
bound esi, dword ptr [ecx]
add byte ptr [eax], al
add byte ptr [eax], al
add byte ptr [eax], al
dec esp
xor dword ptr [eax], eax
add byte ptr [esi+37h], ah
jle 00007FEE849438D9h
push ds
rcl cl, cl
inc esp
mov eax, 4447D896h
mov cl, 7Eh
jmp 00007FEE84943970h
push 0000007Ch
not byte ptr [eax+64h]
or al, 48h
lea eax, dword ptr [ecx+11h]
xor ah, byte ptr [ecx+4Ch]
cmc
cmp cl, byte ptr [bx-53h]
xor ebx, dword ptr [ecx-48EE309Ah]
or al, 00h
stosb
add byte ptr [eax-2Dh], ah
xchg eax, ebx
add byte ptr [eax], al
add byte ptr [eax], al
add byte ptr [eax], al
add byte ptr [eax], al
add byte ptr [eax], al
add byte ptr [eax], al
add byte ptr [eax], al
add byte ptr [eax], al
add byte ptr [eax], al
add byte ptr [eax], al
add byte ptr [eax], al
add byte ptr [eax], al
add byte ptr [eax], al
add byte ptr [eax], al
add byte ptr [eax], al
add byte ptr [eax], al
add byte ptr [eax], al
add byte ptr [eax], al
adc ecx, dword ptr [ecx]
add byte ptr [eax], al
push cs
or dword ptr [eax], eax
add byte ptr [eax], al
add eax, 62794800h
insb
aaa
add byte ptr [4D000901h], cl
jns 00007FEE849439B1h
jo 00007FEE849439A3h
je 00007FEE849439AAh
jns 00007FEE84943977h

Data Directories

Name	Virtual Address	Virtual Size	Is in Section
IMAGE_DIRECTORY_ENTRY_EXPORT	0x0	0x0
IMAGE_DIRECTORY_ENTRY_IMPORT	0x157d4	0x28	.text
IMAGE_DIRECTORY_ENTRY_RESOURCE	0x18000	0xc08	.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	0xe0	.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	0x14bfc	0x15000	False	0.442638578869	data	6.71966680684	IMAGE_SCN_MEM_EXECUTE, IMAGE_SCN_CNT_CODE, IMAGE_SCN_MEM_READ
.data	0x16000	0x11b0	0x1000	False	0.00634765625	data	0.0	IMAGE_SCN_CNT_INITIALIZED_DATA, IMAGE_SCN_MEM_WRITE, IMAGE_SCN_MEM_READ
.rsrc	0x18000	0xc08	0x1000	False	0.311279296875	data	3.24284778332	IMAGE_SCN_CNT_INITIALIZED_DATA, IMAGE_SCN_MEM_READ

Resources

Name	RVA	Size	Type	Language	Country
RT_ICON	0x18360	0x8a8	data
RT_GROUP_ICON	0x1834c	0x14	data
RT_VERSION	0x180f0	0x25c	data	Chinese	Taiwan

Imports

DLL

Import

MSVBVM60.DLL

_CIcos, _adj_fptan, __vbaFreeVar, __vbaFreeVarList, _adj_fdiv_m64, __vbaFreeObjList, _adj_fprem1, __vbaSetSystemError, __vbaHresultCheckObj, _adj_fdiv_m32, __vbaVarForInit, __vbaObjSet, _adj_fdiv_m16i, _adj_fdivr_m16i, __vbaFpR8, _CIsin, __vbaChkstk, EVENT_SINK_AddRef, __vbaStrCmp, DllFunctionCall, _adj_fpatan, EVENT_SINK_Release, _CIsqrt, EVENT_SINK_QueryInterface, __vbaExceptHandler, _adj_fprem, _adj_fdivr_m64, __vbaFPException, _CIlog, __vbaFileOpen, __vbaNew2, _adj_fdiv_m32i, _adj_fdivr_m32i, __vbaStrCopy, __vbaFreeStrList, _adj_fdivr_m32, _adj_fdiv_r, __vbaStrToAnsi, __vbaFpI4, _CIatan, __vbaUI1Str, __vbaCastObj, __vbaStrMove, _allmul, _CItan, __vbaVarForNext, _CIexp, __vbaFreeObj, __vbaFreeStr

Version Infos

Description	Data
Translation	0x0404 0x04b0
InternalName	Underno3
FileVersion	1.00
CompanyName	Collapse Magical
Comments	Collapse Magical
ProductName	dece
ProductVersion	1.00
OriginalFilename	Underno3.exe

Possible Origin

Language of compilation system	Country where language is spoken	Map
Chinese	Taiwan

Network Behavior

No network behavior found

Code Manipulations

Statistics

System Behavior

Analysis Process: PO#578946.exe PID: 4828 Parent PID: 5976

General

Start time:	09:26:56
Start date:	02/08/2021
Path:	C:\Users\user\Desktop\PO#578946.exe
Wow64 process (32bit):	true
Commandline:	'C:\Users\user\Desktop\PO#578946.exe'
Imagebase:	0x400000
File size:	98304 bytes
MD5 hash:	691BDE1D30C382256FF1072B8F305841
Has elevated privileges:	true
Has administrator privileges:	true
Programmed in:	Visual Basic
Yara matches:	Rule: JoeSecurity_GuLoader_2, Description: Yara detected GuLoader, Source: 00000000.00000002.868117942.0000000002420000.00000040.00000001.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 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

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Warning!

Windows Analysis Report PO#578946.exe

Overview

General Information

Detection

Signatures

Classification

Process Tree

Malware Configuration

Threatname: GuLoader

Yara Overview

Memory Dumps

Sigma Overview

Jbx 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:

Language, Device and Operating System Detection:

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: PO#578946.exe PID: 4828 Parent PID: 5976

General

Disassembly

Code Analysis