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Windows Analysis Report REVGKXx6Ns.exe

Overview

General Information

Sample Name:	REVGKXx6Ns.exe
Analysis ID:	527899
MD5:	7c91db57c98a1f0e38ba65ed651b4779
SHA1:	28cb0d40a73c1a421a9720808d49da010f9ff4ef
SHA256:	12992fe3f998693d92625c53bf5aa6723e87c8c3fb7057dbba4b334742cab376
Infos:
Most interesting Screenshot:

Detection

GuLoader

Score:	76
Range:	0 - 100
Whitelisted:	false
Confidence:	100%

Signatures

Found malware configuration

Multi AV Scanner detection for submitted file

Yara detected GuLoader

C2 URLs / IPs found in malware configuration

Found potential dummy code loops (likely to delay analysis)

Machine Learning detection for sample

Uses 32bit PE files

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

PE file contains strange resources

Contains functionality to read the PEB

Uses code obfuscation techniques (call, push, ret)

Detected potential crypto function

Program does not show much activity (idle)

Contains functionality for execution timing, often used to detect debuggers

Abnormal high CPU Usage

Classification

Process Tree

System is w10x64

REVGKXx6Ns.exe (PID: 7160 cmdline: "C:\Users\user\Desktop\REVGKXx6Ns.exe" MD5: 7C91DB57C98A1F0E38BA65ED651B4779)

cleanup

Malware Configuration

Threatname: GuLoader

{"Payload URL": "https://drive.google.com/uc?export=downlo_"}

Yara Overview

Memory Dumps

Source	Rule	Description	Author	Strings
00000000.00000002.1188260352.0000000002180000.00000040.00000001.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:

Found malware configuration

Show sources

Source: 00000000.00000002.1188260352.0000000002180000.00000040.00000001.sdmp

Malware Configuration Extractor: GuLoader {"Payload URL": "https://drive.google.com/uc?export=downlo_"}

Multi AV Scanner detection for submitted file

Show sources

Source: REVGKXx6Ns.exe	Virustotal: Detection: 62%	Perma Link
Source: REVGKXx6Ns.exe	Metadefender: Detection: 34%	Perma Link
Source: REVGKXx6Ns.exe	ReversingLabs: Detection: 71%

Machine Learning detection for sample

Show sources

Source: REVGKXx6Ns.exe

Joe Sandbox ML: detected

Source: REVGKXx6Ns.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=downlo_

Source: REVGKXx6Ns.exe	String found in binary or memory: http://topqualityfreeware.com
Source: REVGKXx6Ns.exe	String found in binary or memory: http://www.topqualityfreeware.com/

Source: REVGKXx6Ns.exe

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

Source: REVGKXx6Ns.exe, 00000000.00000002.1187905826.0000000000426000.00000002.00020000.sdmp	Binary or memory string: OriginalFilenameObumbration1.exe vs REVGKXx6Ns.exe
Source: REVGKXx6Ns.exe	Binary or memory string: OriginalFilenameObumbration1.exe vs REVGKXx6Ns.exe

Source: REVGKXx6Ns.exe	Static PE information: Resource name: RT_ICON type: GLS_BINARY_LSB_FIRST
Source: REVGKXx6Ns.exe	Static PE information: Resource name: RT_ICON type: GLS_BINARY_LSB_FIRST

Source: C:\Users\user\Desktop\REVGKXx6Ns.exe	Code function: 0_2_004090A6
Source: C:\Users\user\Desktop\REVGKXx6Ns.exe	Code function: 0_2_02196B59
Source: C:\Users\user\Desktop\REVGKXx6Ns.exe	Code function: 0_2_0218E22D
Source: C:\Users\user\Desktop\REVGKXx6Ns.exe	Code function: 0_2_02189E78
Source: C:\Users\user\Desktop\REVGKXx6Ns.exe	Code function: 0_2_021892A8
Source: C:\Users\user\Desktop\REVGKXx6Ns.exe	Code function: 0_2_02189AAB
Source: C:\Users\user\Desktop\REVGKXx6Ns.exe	Code function: 0_2_0218AED8
Source: C:\Users\user\Desktop\REVGKXx6Ns.exe	Code function: 0_2_0218AADB
Source: C:\Users\user\Desktop\REVGKXx6Ns.exe	Code function: 0_2_02194AF5
Source: C:\Users\user\Desktop\REVGKXx6Ns.exe	Code function: 0_2_02189314
Source: C:\Users\user\Desktop\REVGKXx6Ns.exe	Code function: 0_2_02180B33
Source: C:\Users\user\Desktop\REVGKXx6Ns.exe	Code function: 0_2_0218A320
Source: C:\Users\user\Desktop\REVGKXx6Ns.exe	Code function: 0_2_0218A75D
Source: C:\Users\user\Desktop\REVGKXx6Ns.exe	Code function: 0_2_0218A364
Source: C:\Users\user\Desktop\REVGKXx6Ns.exe	Code function: 0_2_02189FAC
Source: C:\Users\user\Desktop\REVGKXx6Ns.exe	Code function: 0_2_02189BD3
Source: C:\Users\user\Desktop\REVGKXx6Ns.exe	Code function: 0_2_02189836
Source: C:\Users\user\Desktop\REVGKXx6Ns.exe	Code function: 0_2_0218AC2E
Source: C:\Users\user\Desktop\REVGKXx6Ns.exe	Code function: 0_2_02189858
Source: C:\Users\user\Desktop\REVGKXx6Ns.exe	Code function: 0_2_0218B044
Source: C:\Users\user\Desktop\REVGKXx6Ns.exe	Code function: 0_2_0218A878
Source: C:\Users\user\Desktop\REVGKXx6Ns.exe	Code function: 0_2_0218D4B3
Source: C:\Users\user\Desktop\REVGKXx6Ns.exe	Code function: 0_2_0218A4CC
Source: C:\Users\user\Desktop\REVGKXx6Ns.exe	Code function: 0_2_0218A0EF
Source: C:\Users\user\Desktop\REVGKXx6Ns.exe	Code function: 0_2_02192D07
Source: C:\Users\user\Desktop\REVGKXx6Ns.exe	Code function: 0_2_02189950
Source: C:\Users\user\Desktop\REVGKXx6Ns.exe	Code function: 0_2_02189D50
Source: C:\Users\user\Desktop\REVGKXx6Ns.exe	Code function: 0_2_0218AD6F
Source: C:\Users\user\Desktop\REVGKXx6Ns.exe	Code function: 0_2_0218B186
Source: C:\Users\user\Desktop\REVGKXx6Ns.exe	Code function: 0_2_0218A9B7

Source: C:\Users\user\Desktop\REVGKXx6Ns.exe

Process Stats: CPU usage > 98%

Source: REVGKXx6Ns.exe	Virustotal: Detection: 62%
Source: REVGKXx6Ns.exe	Metadefender: Detection: 34%
Source: REVGKXx6Ns.exe	ReversingLabs: Detection: 71%

Source: REVGKXx6Ns.exe

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

Source: C:\Users\user\Desktop\REVGKXx6Ns.exe

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

Source: C:\Users\user\Desktop\REVGKXx6Ns.exe

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

Source: C:\Users\user\Desktop\REVGKXx6Ns.exe

File created: C:\Users\user\AppData\Local\Temp\~DF6497174BCC55AD21.TMP

Jump to behavior

Source: classification engine

Classification label: mal76.troj.evad.winEXE@1/1@0/0

Data Obfuscation:

Yara detected GuLoader

Show sources

Source: Yara match

File source: 00000000.00000002.1188260352.0000000002180000.00000040.00000001.sdmp, type: MEMORY

Source: C:\Users\user\Desktop\REVGKXx6Ns.exe	Code function: 0_2_00404401 pushfd ; retf
Source: C:\Users\user\Desktop\REVGKXx6Ns.exe	Code function: 0_2_00403826 push es; ret
Source: C:\Users\user\Desktop\REVGKXx6Ns.exe	Code function: 0_2_004044E5 pushfd ; retf
Source: C:\Users\user\Desktop\REVGKXx6Ns.exe	Code function: 0_2_00404584 pushfd ; retf
Source: C:\Users\user\Desktop\REVGKXx6Ns.exe	Code function: 0_2_00404599 pushfd ; retf
Source: C:\Users\user\Desktop\REVGKXx6Ns.exe	Code function: 0_2_004051BE push dword ptr [esi]; iretd
Source: C:\Users\user\Desktop\REVGKXx6Ns.exe	Code function: 0_2_0040665D pushfd ; retf
Source: C:\Users\user\Desktop\REVGKXx6Ns.exe	Code function: 0_2_00404279 pushfd ; retf
Source: C:\Users\user\Desktop\REVGKXx6Ns.exe	Code function: 0_2_004062C1 pushfd ; retf
Source: C:\Users\user\Desktop\REVGKXx6Ns.exe	Code function: 0_2_004072E1 pushfd ; retf
Source: C:\Users\user\Desktop\REVGKXx6Ns.exe	Code function: 0_2_004096FC push eax; iretd
Source: C:\Users\user\Desktop\REVGKXx6Ns.exe	Code function: 0_2_00404349 pushfd ; retf
Source: C:\Users\user\Desktop\REVGKXx6Ns.exe	Code function: 0_2_00404335 pushfd ; retf
Source: C:\Users\user\Desktop\REVGKXx6Ns.exe	Code function: 0_2_0040633D pushfd ; retf
Source: C:\Users\user\Desktop\REVGKXx6Ns.exe	Code function: 0_2_004067DE pushfd ; retf
Source: C:\Users\user\Desktop\REVGKXx6Ns.exe	Code function: 0_2_0040A784 push 18165C0Eh; iretd
Source: C:\Users\user\Desktop\REVGKXx6Ns.exe	Code function: 0_2_0218423B push 81528D88h; ret
Source: C:\Users\user\Desktop\REVGKXx6Ns.exe	Code function: 0_2_02182644 push ss; retf
Source: C:\Users\user\Desktop\REVGKXx6Ns.exe	Code function: 0_2_02186E73 push E8000002h; retf
Source: C:\Users\user\Desktop\REVGKXx6Ns.exe	Code function: 0_2_02185ECB push edi; ret
Source: C:\Users\user\Desktop\REVGKXx6Ns.exe	Code function: 0_2_02180EF4 push eax; retf
Source: C:\Users\user\Desktop\REVGKXx6Ns.exe	Code function: 0_2_02185C22 push edi; ret
Source: C:\Users\user\Desktop\REVGKXx6Ns.exe	Code function: 0_2_02181447 push ds; ret
Source: C:\Users\user\Desktop\REVGKXx6Ns.exe	Code function: 0_2_021848A7 pushfd ; ret
Source: C:\Users\user\Desktop\REVGKXx6Ns.exe	Code function: 0_2_0218191A push ebx; retf
Source: C:\Users\user\Desktop\REVGKXx6Ns.exe	Code function: 0_2_0218491D pushfd ; ret
Source: C:\Users\user\Desktop\REVGKXx6Ns.exe	Code function: 0_2_02184924 pushfd ; ret
Source: C:\Users\user\Desktop\REVGKXx6Ns.exe	Code function: 0_2_02185DDC push edi; ret
Source: C:\Users\user\Desktop\REVGKXx6Ns.exe	Code function: 0_2_02185DC1 push edi; ret

Source: C:\Users\user\Desktop\REVGKXx6Ns.exe

Process information set: NOOPENFILEERRORBOX

Source: all processes

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

Source: C:\Users\user\Desktop\REVGKXx6Ns.exe

Code function: 0_2_0218CAA8 rdtsc

Anti Debugging:

Found potential dummy code loops (likely to delay analysis)

Show sources

Source: C:\Users\user\Desktop\REVGKXx6Ns.exe

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

Source: C:\Users\user\Desktop\REVGKXx6Ns.exe	Code function: 0_2_0218C664 mov eax, dword ptr fs:[00000030h]
Source: C:\Users\user\Desktop\REVGKXx6Ns.exe	Code function: 0_2_021932C9 mov eax, dword ptr fs:[00000030h]
Source: C:\Users\user\Desktop\REVGKXx6Ns.exe	Code function: 0_2_02188730 mov eax, dword ptr fs:[00000030h]
Source: C:\Users\user\Desktop\REVGKXx6Ns.exe	Code function: 0_2_0219286B 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: C:\Users\user\Desktop\REVGKXx6Ns.exe

Code function: 0_2_0218CAA8 rdtsc

Source: C:\Users\user\Desktop\REVGKXx6Ns.exe

Code function: 0_2_02196B59 RtlAddVectoredExceptionHandler,

Source: REVGKXx6Ns.exe, 00000000.00000002.1188147366.0000000000CD0000.00000002.00020000.sdmp	Binary or memory string: Program Manager
Source: REVGKXx6Ns.exe, 00000000.00000002.1188147366.0000000000CD0000.00000002.00020000.sdmp	Binary or memory string: Shell_TrayWnd
Source: REVGKXx6Ns.exe, 00000000.00000002.1188147366.0000000000CD0000.00000002.00020000.sdmp	Binary or memory string: Progman
Source: REVGKXx6Ns.exe, 00000000.00000002.1188147366.0000000000CD0000.00000002.00020000.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	Virtualization/Sandbox Evasion11	OS Credential Dumping	Security Software Discovery11	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 Discovery1	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
REVGKXx6Ns.exe	63%	Virustotal		Browse
REVGKXx6Ns.exe	34%	Metadefender		Browse
REVGKXx6Ns.exe	71%	ReversingLabs	Win32.Trojan.GuLoader
REVGKXx6Ns.exe	100%	Joe Sandbox ML

Dropped Files

No Antivirus matches

Unpacked PE Files

No Antivirus matches

Domains

No Antivirus matches

URLs

Source	Detection	Scanner	Label	Link
http://topqualityfreeware.com	0%	Virustotal		Browse
http://topqualityfreeware.com	0%	Avira URL Cloud	safe
http://www.topqualityfreeware.com/	0%	Virustotal		Browse
http://www.topqualityfreeware.com/	0%	Avira URL Cloud	safe

Domains and IPs

Contacted Domains

No contacted domains info

URLs from Memory and Binaries

Name	Source	Malicious	Antivirus Detection	Reputation
http://topqualityfreeware.com	REVGKXx6Ns.exe	false	0%, Virustotal, Browse Avira URL Cloud: safe	unknown
http://www.topqualityfreeware.com/	REVGKXx6Ns.exe	false	0%, Virustotal, Browse Avira URL Cloud: safe	unknown

Contacted IPs

No contacted IP infos

General Information

Joe Sandbox Version:	34.0.0 Boulder Opal
Analysis ID:	527899
Start date:	24.11.2021
Start time:	15:05:14
Joe Sandbox Product:	CloudBasic
Overall analysis duration:	0h 7m 29s
Hypervisor based Inspection enabled:	false
Report type:	light
Sample file name:	REVGKXx6Ns.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:	15
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:	mal76.troj.evad.winEXE@1/1@0/0
EGA Information:	Successful, ratio: 100%
HDC Information:	Successful, ratio: 54.1% (good quality ratio 41%) Quality average: 47.9% Quality standard deviation: 35%
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): BackgroundTransferHost.exe, backgroundTaskHost.exe, svchost.exe, wuapihost.exe Excluded IPs from analysis (whitelisted): 92.122.145.220 Excluded domains from analysis (whitelisted): ris.api.iris.microsoft.com, e12564.dspb.akamaiedge.net, store-images.s-microsoft.com, store-images.s-microsoft.com-c.edgekey.net, displaycatalog.mp.microsoft.com, img-prod-cms-rt-microsoft-com.akamaized.net, arc.msn.com

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

C:\Users\user\AppData\Local\Temp\~DF6497174BCC55AD21.TMP Download File
Process:	C:\Users\user\Desktop\REVGKXx6Ns.exe
File Type:	Unknown
Category:	dropped
Size (bytes):	32768
Entropy (8bit):	4.01191323271951
Encrypted:	false
SSDEEP:	384:wcZ0tADSVlx6JQhynrV7Vr9wrCIM/ZUYVPzBAPN:wcZeADSV/6qhynrV7VxwrrMvqPN
MD5:	6C4C01A4316CD9338DE51EC175EBF11D
SHA1:	8C5D5B07E0ED6AAC72705F516E25BEAEA891EFA0
SHA-256:	95876F7C1242672418DB201C02D70276EE9CC4345394DEAD3500619A39DA28F0
SHA-512:	9F60729E865B0414DB4792F76465EDCE1595D22E884D01C07389A312474D1CE916E4CF73275D5AA0CB411D8EBB0617EF661CD10467AD838FD1B0B388C44823D5
Malicious:	false
Reputation:	low
Preview:	......................>...............................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................

Static File Info

General
File type:	PE32 executable (GUI) Intel 80386, for MS Windows
Entropy (8bit):	4.926810109816392
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:	REVGKXx6Ns.exe
File size:	192512
MD5:	7c91db57c98a1f0e38ba65ed651b4779
SHA1:	28cb0d40a73c1a421a9720808d49da010f9ff4ef
SHA256:	12992fe3f998693d92625c53bf5aa6723e87c8c3fb7057dbba4b334742cab376
SHA512:	2ca3ac7de708b85262bd7e9d42b0cd78cd0af4f92c1da9c7be9d2e473bcc238a5935030eff688049d8c75fd3c3fd8fd80a5703eca4ab112e3a0997e74d6ac58a
SSDEEP:	3072:tdejCYyLGrRDAfor5hlNZI71PAMrc0yvhXeJ:tdeiGrRDAfA5XXMrcbeJ
File Content Preview:	MZ......................@...............................................!..L.!This program cannot be run in DOS mode....$........i.......................*..............Rich....................PE..L.....&T.................0..........L........@....@........

File Icon


Icon Hash:	0ceefedec6f67c0c

Static PE Info

General
Entrypoint:	0x40134c
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:	0x54260EAF [Sat Sep 27 01:11:11 2014 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:	f27a613fda76c14f4eab7dc0085d799e

Entrypoint Preview

Instruction
push 00407F64h
call 00007F3CD8F8BE63h
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 [edi+6Eh], ch
jl 00007F3CD8F8BE9Fh
iretd
je 00007F3CD8F8BE50h
inc edi
mov ebp, 13705FC0h
ror byte ptr [eax+00000034h], 00000000h
add byte ptr [eax], al
add dword ptr [eax], eax
add byte ptr [eax], al
sub byte ptr [ebp-2B77FF20h], bh
jne 00007F3CD8F8BED6h
jo 00007F3CD8F8BED7h
outsb
jnc 00007F3CD8F8BEDEh
outsb
add cl, bl
add byte ptr [esi], al
mov byte ptr [eax], al
add byte ptr [eax], al
add bh, bh
int3
xor dword ptr [eax], eax
add eax, 79A2685Bh
out B9h, eax
mov eax, dword ptr [A56F894Ah]
sbb dword ptr [esi+33505045h], ebp
in eax, ABh
movsd
pushfd
push ds
inc edi
inc eax
scasd
push edi
jc 00007F3CD8F8BE0Bh
je 00007F3CD8F8BE8Ah
push ebx
jnle 00007F3CD8F8BEACh
dec edi
lodsd
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
je 00007F3CD8F8BEDBh
add byte ptr [eax], al
call far 0009h : 00000068h
push ebp
outsb
jo 00007F3CD8F8BEE7h
jnc 00007F3CD8F8BEDAh
xor eax, dword ptr fs:[eax]
or eax, 51000901h
jne 00007F3CD8F8BED7h
jc 00007F3CD8F8BEDCh

Data Directories

Name	Virtual Address	Virtual Size	Is in Section
IMAGE_DIRECTORY_ENTRY_EXPORT	0x0	0x0
IMAGE_DIRECTORY_ENTRY_IMPORT	0x23554	0x28	.text
IMAGE_DIRECTORY_ENTRY_RESOURCE	0x26000	0x90d5	.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	0x230	0x20
IMAGE_DIRECTORY_ENTRY_IAT	0x1000	0x100	.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	0x229ac	0x23000	False	0.354959542411	data	5.0849300681	IMAGE_SCN_MEM_EXECUTE, IMAGE_SCN_CNT_CODE, IMAGE_SCN_MEM_READ
.data	0x24000	0x13f0	0x1000	False	0.00634765625	data	0.0	IMAGE_SCN_CNT_INITIALIZED_DATA, IMAGE_SCN_MEM_WRITE, IMAGE_SCN_MEM_READ
.rsrc	0x26000	0x90d5	0xa000	False	0.346411132813	data	4.35437576998	IMAGE_SCN_CNT_INITIALIZED_DATA, IMAGE_SCN_MEM_READ

Resources

Name	RVA	Size	Type	Language	Country
CUSTOM	0x2e817	0x8be	MS Windows icon resource - 1 icon, 32x32, 8 bits/pixel	English	United States
INSTALL	0x2d39d	0x8be	MS Windows icon resource - 1 icon, 32x32	English	United States
INSTALL	0x2ce9a	0x503	ISO-8859 text, with CRLF line terminators	English	United States
SETUP	0x2e519	0x2fe	MS Windows icon resource - 1 icon, 32x32, 16 colors	English	United States
SETUP	0x2dc5b	0x8be	MS Windows icon resource - 1 icon, 32x32	English	United States
RT_ICON	0x2bff2	0xea8	data
RT_ICON	0x2b74a	0x8a8	data
RT_ICON	0x2b082	0x6c8	data
RT_ICON	0x2ab1a	0x568	GLS_BINARY_LSB_FIRST
RT_ICON	0x28572	0x25a8	dBase III DBT, version number 0, next free block index 40
RT_ICON	0x274ca	0x10a8	dBase III DBT, version number 0, next free block index 40
RT_ICON	0x26b42	0x988	dBase III DBT, version number 0, next free block index 40
RT_ICON	0x266da	0x468	GLS_BINARY_LSB_FIRST
RT_GROUP_ICON	0x26664	0x76	data
RT_VERSION	0x263a0	0x2c4	data	Turkmen	Turkmenistan

Imports

DLL

Import

MSVBVM60.DLL

_CIcos, _adj_fptan, __vbaVarMove, __vbaFreeVar, __vbaAryMove, __vbaStrVarMove, __vbaFreeVarList, __vbaVarIdiv, _adj_fdiv_m64, __vbaFreeObjList, _adj_fprem1, __vbaHresultCheckObj, _adj_fdiv_m32, __vbaAryDestruct, __vbaObjSet, __vbaOnError, _adj_fdiv_m16i, __vbaObjSetAddref, _adj_fdivr_m16i, __vbaFPFix, __vbaFpR8, _CIsin, __vbaChkstk, EVENT_SINK_AddRef, __vbaStrCmp, _adj_fpatan, EVENT_SINK_Release, _CIsqrt, EVENT_SINK_QueryInterface, __vbaExceptHandler, _adj_fprem, _adj_fdivr_m64, __vbaFPException, _CIlog, __vbaNew2, __vbaVar2Vec, __vbaR8Str, _adj_fdiv_m32i, _adj_fdivr_m32i, _adj_fdivr_m32, _adj_fdiv_r, __vbaI4Var, __vbaVarDup, __vbaFpI4, _CIatan, __vbaStrMove, _allmul, _CItan, _CIexp, __vbaFreeStr, __vbaFreeObj

Version Infos

Description	Data
Translation	0x0442 0x04b0
LegalCopyright	Identiv
InternalName	Obumbration1
FileVersion	1.00
CompanyName	Identiv
LegalTrademarks	Identiv
ProductName	Identiv
ProductVersion	1.00
FileDescription	Identiv
OriginalFilename	Obumbration1.exe

Possible Origin

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

Network Behavior

No network behavior found

Code Manipulations

Statistics

System Behavior

Analysis Process: REVGKXx6Ns.exe PID: 7160 Parent PID: 6460

General

Start time:	15:06:10
Start date:	24/11/2021
Path:	C:\Users\user\Desktop\REVGKXx6Ns.exe
Wow64 process (32bit):	true
Commandline:	"C:\Users\user\Desktop\REVGKXx6Ns.exe"
Imagebase:	0x400000
File size:	192512 bytes
MD5 hash:	7C91DB57C98A1F0E38BA65ED651B4779
Has elevated privileges:	true
Has administrator privileges:	true
Programmed in:	Visual Basic
Yara matches:	Rule: JoeSecurity_GuLoader_2, Description: Yara detected GuLoader, Source: 00000000.00000002.1188260352.0000000002180000.00000040.00000001.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 REVGKXx6Ns.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:

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

URLs from Memory and Binaries

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: REVGKXx6Ns.exe PID: 7160 Parent PID: 6460

General

Disassembly

Code Analysis