Malware Analysis Report

2025-03-14 22:09

Sample ID 250219-3z8tcstnw7
Target JaffaCakes118_0875ca39c874289d82bab473897ffb7c
SHA256 638f714836e4a7f98e54d185afd717ccf1d75293c5c0b23e3f3bd5a09d5b3fe1
Tags
vobfus discovery persistence upx worm
score
10/10

Table of Contents

Analysis Overview

MITRE ATT&CK

Enterprise Matrix V15

Analysis: static1

Detonation Overview

Signatures

Analysis: behavioral1

Detonation Overview

Command Line

Signatures

Processes

Network

Files

Analysis: behavioral2

Detonation Overview

Command Line

Signatures

Processes

Network

Files

Analysis Overview

score
10/10

SHA256

638f714836e4a7f98e54d185afd717ccf1d75293c5c0b23e3f3bd5a09d5b3fe1

Threat Level: Known bad

The file JaffaCakes118_0875ca39c874289d82bab473897ffb7c was found to be: Known bad.

Malicious Activity Summary

vobfus discovery persistence upx worm

Vobfus

Vobfus family

Adds policy Run key to start application

Adds Run key to start application

UPX packed file

Suspicious use of SetThreadContext

System Location Discovery: System Language Discovery

Unsigned PE

Script User-Agent

Suspicious behavior: RenamesItself

Suspicious use of SetWindowsHookEx

Suspicious use of WriteProcessMemory

MITRE ATT&CK

Analysis: static1

Detonation Overview

Reported

2025-02-19 23:58

Signatures

Unsigned PE

Description Indicator Process Target
N/A N/A N/A N/A

Analysis: behavioral1

Detonation Overview

Submitted

2025-02-19 23:58

Reported

2025-02-20 00:00

Platform

win7-20240903-en

Max time kernel

142s

Max time network

145s

Command Line

"C:\Users\Admin\AppData\Local\Temp\JaffaCakes118_0875ca39c874289d82bab473897ffb7c.exe"

Signatures

Vobfus

worm vobfus

Vobfus family

vobfus

Adds policy Run key to start application

persistence
Description Indicator Process Target
Set value (str) \REGISTRY\USER\S-1-5-21-2872745919-2748461613-2989606286-1000\Software\Microsoft\Windows\CurrentVersion\Policies\Explorer\run\9ZOK0LE4KJ3SJ = "C:\\Users\\Admin\\AppData\\Roaming\\5G5HSPCDW7G.exe" C:\Users\Admin\AppData\Local\Temp\JaffaCakes118_0875ca39c874289d82bab473897ffb7c.exe N/A
Key created \REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\Explorer\run C:\Users\Admin\AppData\Local\Temp\JaffaCakes118_0875ca39c874289d82bab473897ffb7c.exe N/A
Set value (str) \REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\Explorer\run\9ZOK0LE4KJ3SJ = "C:\\Users\\Admin\\AppData\\Roaming\\5G5HSPCDW7G.exe" C:\Users\Admin\AppData\Local\Temp\JaffaCakes118_0875ca39c874289d82bab473897ffb7c.exe N/A
Key created \REGISTRY\USER\S-1-5-21-2872745919-2748461613-2989606286-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\policies\Explorer\run C:\Users\Admin\AppData\Local\Temp\JaffaCakes118_0875ca39c874289d82bab473897ffb7c.exe N/A

Adds Run key to start application

persistence
Description Indicator Process Target
Set value (str) \REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Windows\CurrentVersion\Run\9ZOK0LE4KJ3SJ = "C:\\Users\\Admin\\AppData\\Roaming\\5G5HSPCDW7G.exe" C:\Users\Admin\AppData\Local\Temp\JaffaCakes118_0875ca39c874289d82bab473897ffb7c.exe N/A
Set value (str) \REGISTRY\USER\S-1-5-21-2872745919-2748461613-2989606286-1000\Software\Microsoft\Windows\CurrentVersion\Run\9ZOK0LE4KJ3SJ = "C:\\Users\\Admin\\AppData\\Roaming\\5G5HSPCDW7G.exe" C:\Users\Admin\AppData\Local\Temp\JaffaCakes118_0875ca39c874289d82bab473897ffb7c.exe N/A

UPX packed file

upx
Description Indicator Process Target
N/A N/A N/A N/A
N/A N/A N/A N/A
N/A N/A N/A N/A
N/A N/A N/A N/A
N/A N/A N/A N/A
N/A N/A N/A N/A
N/A N/A N/A N/A
N/A N/A N/A N/A
N/A N/A N/A N/A
N/A N/A N/A N/A

System Location Discovery: System Language Discovery

discovery
Description Indicator Process Target
Key opened \REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language C:\Users\Admin\AppData\Local\Temp\JaffaCakes118_0875ca39c874289d82bab473897ffb7c.exe N/A
Key opened \REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language C:\Users\Admin\AppData\Local\Temp\JaffaCakes118_0875ca39c874289d82bab473897ffb7c.exe N/A

Script User-Agent

Description Indicator Process Target
HTTP User-Agent header Mozilla/4.0 (compatible; Win32; WinHttp.WinHttpRequest.5) N/A N/A
HTTP User-Agent header Mozilla/4.0 (compatible; Win32; WinHttp.WinHttpRequest.5) N/A N/A

Suspicious behavior: RenamesItself

Description Indicator Process Target
N/A N/A C:\Users\Admin\AppData\Local\Temp\JaffaCakes118_0875ca39c874289d82bab473897ffb7c.exe N/A

Suspicious use of SetWindowsHookEx

Description Indicator Process Target
N/A N/A C:\Users\Admin\AppData\Local\Temp\JaffaCakes118_0875ca39c874289d82bab473897ffb7c.exe N/A

Suspicious use of WriteProcessMemory

Description Indicator Process Target
PID 2816 wrote to memory of 2672 N/A C:\Users\Admin\AppData\Local\Temp\JaffaCakes118_0875ca39c874289d82bab473897ffb7c.exe C:\Users\Admin\AppData\Local\Temp\JaffaCakes118_0875ca39c874289d82bab473897ffb7c.exe
PID 2816 wrote to memory of 2672 N/A C:\Users\Admin\AppData\Local\Temp\JaffaCakes118_0875ca39c874289d82bab473897ffb7c.exe C:\Users\Admin\AppData\Local\Temp\JaffaCakes118_0875ca39c874289d82bab473897ffb7c.exe
PID 2816 wrote to memory of 2672 N/A C:\Users\Admin\AppData\Local\Temp\JaffaCakes118_0875ca39c874289d82bab473897ffb7c.exe C:\Users\Admin\AppData\Local\Temp\JaffaCakes118_0875ca39c874289d82bab473897ffb7c.exe
PID 2816 wrote to memory of 2672 N/A C:\Users\Admin\AppData\Local\Temp\JaffaCakes118_0875ca39c874289d82bab473897ffb7c.exe C:\Users\Admin\AppData\Local\Temp\JaffaCakes118_0875ca39c874289d82bab473897ffb7c.exe
PID 2816 wrote to memory of 2672 N/A C:\Users\Admin\AppData\Local\Temp\JaffaCakes118_0875ca39c874289d82bab473897ffb7c.exe C:\Users\Admin\AppData\Local\Temp\JaffaCakes118_0875ca39c874289d82bab473897ffb7c.exe
PID 2816 wrote to memory of 2672 N/A C:\Users\Admin\AppData\Local\Temp\JaffaCakes118_0875ca39c874289d82bab473897ffb7c.exe C:\Users\Admin\AppData\Local\Temp\JaffaCakes118_0875ca39c874289d82bab473897ffb7c.exe
PID 2816 wrote to memory of 2672 N/A C:\Users\Admin\AppData\Local\Temp\JaffaCakes118_0875ca39c874289d82bab473897ffb7c.exe C:\Users\Admin\AppData\Local\Temp\JaffaCakes118_0875ca39c874289d82bab473897ffb7c.exe

Processes

C:\Users\Admin\AppData\Local\Temp\JaffaCakes118_0875ca39c874289d82bab473897ffb7c.exe

"C:\Users\Admin\AppData\Local\Temp\JaffaCakes118_0875ca39c874289d82bab473897ffb7c.exe"

C:\Users\Admin\AppData\Local\Temp\JaffaCakes118_0875ca39c874289d82bab473897ffb7c.exe

C:\Users\Admin\AppData\Local\Temp\JaffaCakes118_0875ca39c874289d82bab473897ffb7c.exe

Network

Country Destination Domain Proto
US 8.8.8.8:53 rsdumps.org udp
US 8.8.8.8:53 rsbot.biz udp
US 8.8.8.8:53 nexuspk.com udp
US 173.0.56.154:80 nexuspk.com tcp
US 173.0.56.154:80 nexuspk.com tcp
US 173.0.56.154:80 nexuspk.com tcp
US 173.0.56.154:80 nexuspk.com tcp
US 173.0.56.154:80 nexuspk.com tcp
US 173.0.56.154:80 nexuspk.com tcp
US 173.0.56.154:80 nexuspk.com tcp
US 173.0.56.154:80 nexuspk.com tcp
US 173.0.56.154:80 nexuspk.com tcp

Files

memory/2816-0-0x0000000000400000-0x0000000000431000-memory.dmp

memory/2672-1-0x0000000000400000-0x000000000054D000-memory.dmp

memory/2672-3-0x0000000000400000-0x000000000054D000-memory.dmp

memory/2672-7-0x0000000000400000-0x000000000054D000-memory.dmp

memory/2672-13-0x0000000000400000-0x000000000054D000-memory.dmp

memory/2672-11-0x0000000000400000-0x000000000054D000-memory.dmp

memory/2672-10-0x0000000000400000-0x000000000054D000-memory.dmp

memory/2672-5-0x0000000000400000-0x000000000054D000-memory.dmp

memory/2816-8-0x0000000000400000-0x0000000000431000-memory.dmp

memory/2672-18-0x0000000000400000-0x000000000054D000-memory.dmp

memory/2672-20-0x0000000000400000-0x000000000054D000-memory.dmp

C:\Users\Admin\AppData\Local\Temp\5g5hspcdw7g.exe.jpg

MD5 0875ca39c874289d82bab473897ffb7c
SHA1 26080d593c21fbc3275a389057e22fdd07024209
SHA256 638f714836e4a7f98e54d185afd717ccf1d75293c5c0b23e3f3bd5a09d5b3fe1
SHA512 d64d782102abc9061af8bccdf714433225614d7060c9dc055273273cad92298d67dffc7773673565b92571fbad0fcef855edd565115e53849a9204ef195a73c8

memory/2672-41-0x0000000000400000-0x000000000054D000-memory.dmp

memory/2672-42-0x0000000000400000-0x000000000054D000-memory.dmp

Analysis: behavioral2

Detonation Overview

Submitted

2025-02-19 23:58

Reported

2025-02-20 00:00

Platform

win10v2004-20250217-en

Max time kernel

143s

Max time network

147s

Command Line

"C:\Users\Admin\AppData\Local\Temp\JaffaCakes118_0875ca39c874289d82bab473897ffb7c.exe"

Signatures

Vobfus

worm vobfus

Vobfus family

vobfus

Adds policy Run key to start application

persistence
Description Indicator Process Target
Key created \REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\Explorer\run C:\Users\Admin\AppData\Local\Temp\JaffaCakes118_0875ca39c874289d82bab473897ffb7c.exe N/A
Set value (str) \REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\Explorer\run\9ZOK0LE4KJ3SJ = "C:\\Users\\Admin\\AppData\\Roaming\\5G5HSPCDW7G.exe" C:\Users\Admin\AppData\Local\Temp\JaffaCakes118_0875ca39c874289d82bab473897ffb7c.exe N/A
Key created \REGISTRY\USER\S-1-5-21-3181990009-820930284-137514597-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\policies\Explorer\run C:\Users\Admin\AppData\Local\Temp\JaffaCakes118_0875ca39c874289d82bab473897ffb7c.exe N/A
Set value (str) \REGISTRY\USER\S-1-5-21-3181990009-820930284-137514597-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\Explorer\run\9ZOK0LE4KJ3SJ = "C:\\Users\\Admin\\AppData\\Roaming\\5G5HSPCDW7G.exe" C:\Users\Admin\AppData\Local\Temp\JaffaCakes118_0875ca39c874289d82bab473897ffb7c.exe N/A

Adds Run key to start application

persistence
Description Indicator Process Target
Set value (str) \REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows\CurrentVersion\Run\9ZOK0LE4KJ3SJ = "C:\\Users\\Admin\\AppData\\Roaming\\5G5HSPCDW7G.exe" C:\Users\Admin\AppData\Local\Temp\JaffaCakes118_0875ca39c874289d82bab473897ffb7c.exe N/A
Set value (str) \REGISTRY\USER\S-1-5-21-3181990009-820930284-137514597-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\9ZOK0LE4KJ3SJ = "C:\\Users\\Admin\\AppData\\Roaming\\5G5HSPCDW7G.exe" C:\Users\Admin\AppData\Local\Temp\JaffaCakes118_0875ca39c874289d82bab473897ffb7c.exe N/A

UPX packed file

upx
Description Indicator Process Target
N/A N/A N/A N/A
N/A N/A N/A N/A
N/A N/A N/A N/A
N/A N/A N/A N/A
N/A N/A N/A N/A
N/A N/A N/A N/A
N/A N/A N/A N/A
N/A N/A N/A N/A

System Location Discovery: System Language Discovery

discovery
Description Indicator Process Target
Key opened \REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language C:\Users\Admin\AppData\Local\Temp\JaffaCakes118_0875ca39c874289d82bab473897ffb7c.exe N/A
Key opened \REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language C:\Users\Admin\AppData\Local\Temp\JaffaCakes118_0875ca39c874289d82bab473897ffb7c.exe N/A

Script User-Agent

Description Indicator Process Target
HTTP User-Agent header Mozilla/4.0 (compatible; Win32; WinHttp.WinHttpRequest.5) N/A N/A
HTTP User-Agent header Mozilla/4.0 (compatible; Win32; WinHttp.WinHttpRequest.5) N/A N/A
HTTP User-Agent header Mozilla/4.0 (compatible; Win32; WinHttp.WinHttpRequest.5) N/A N/A
HTTP User-Agent header Mozilla/4.0 (compatible; Win32; WinHttp.WinHttpRequest.5) N/A N/A

Suspicious behavior: RenamesItself

Description Indicator Process Target
N/A N/A C:\Users\Admin\AppData\Local\Temp\JaffaCakes118_0875ca39c874289d82bab473897ffb7c.exe N/A

Suspicious use of SetWindowsHookEx

Description Indicator Process Target
N/A N/A C:\Users\Admin\AppData\Local\Temp\JaffaCakes118_0875ca39c874289d82bab473897ffb7c.exe N/A

Suspicious use of WriteProcessMemory

Description Indicator Process Target
PID 232 wrote to memory of 2920 N/A C:\Users\Admin\AppData\Local\Temp\JaffaCakes118_0875ca39c874289d82bab473897ffb7c.exe C:\Users\Admin\AppData\Local\Temp\JaffaCakes118_0875ca39c874289d82bab473897ffb7c.exe
PID 232 wrote to memory of 2920 N/A C:\Users\Admin\AppData\Local\Temp\JaffaCakes118_0875ca39c874289d82bab473897ffb7c.exe C:\Users\Admin\AppData\Local\Temp\JaffaCakes118_0875ca39c874289d82bab473897ffb7c.exe
PID 232 wrote to memory of 2920 N/A C:\Users\Admin\AppData\Local\Temp\JaffaCakes118_0875ca39c874289d82bab473897ffb7c.exe C:\Users\Admin\AppData\Local\Temp\JaffaCakes118_0875ca39c874289d82bab473897ffb7c.exe
PID 232 wrote to memory of 2920 N/A C:\Users\Admin\AppData\Local\Temp\JaffaCakes118_0875ca39c874289d82bab473897ffb7c.exe C:\Users\Admin\AppData\Local\Temp\JaffaCakes118_0875ca39c874289d82bab473897ffb7c.exe
PID 232 wrote to memory of 2920 N/A C:\Users\Admin\AppData\Local\Temp\JaffaCakes118_0875ca39c874289d82bab473897ffb7c.exe C:\Users\Admin\AppData\Local\Temp\JaffaCakes118_0875ca39c874289d82bab473897ffb7c.exe
PID 232 wrote to memory of 2920 N/A C:\Users\Admin\AppData\Local\Temp\JaffaCakes118_0875ca39c874289d82bab473897ffb7c.exe C:\Users\Admin\AppData\Local\Temp\JaffaCakes118_0875ca39c874289d82bab473897ffb7c.exe
PID 232 wrote to memory of 2920 N/A C:\Users\Admin\AppData\Local\Temp\JaffaCakes118_0875ca39c874289d82bab473897ffb7c.exe C:\Users\Admin\AppData\Local\Temp\JaffaCakes118_0875ca39c874289d82bab473897ffb7c.exe

Processes

C:\Users\Admin\AppData\Local\Temp\JaffaCakes118_0875ca39c874289d82bab473897ffb7c.exe

"C:\Users\Admin\AppData\Local\Temp\JaffaCakes118_0875ca39c874289d82bab473897ffb7c.exe"

C:\Users\Admin\AppData\Local\Temp\JaffaCakes118_0875ca39c874289d82bab473897ffb7c.exe

C:\Users\Admin\AppData\Local\Temp\JaffaCakes118_0875ca39c874289d82bab473897ffb7c.exe

Network

Country Destination Domain Proto
US 8.8.8.8:53 g.bing.com udp
US 150.171.27.10:443 g.bing.com tcp
US 8.8.8.8:53 tse1.mm.bing.net udp
US 150.171.27.10:443 tse1.mm.bing.net tcp
US 8.8.8.8:53 rsdumps.org udp
US 8.8.8.8:53 rsbot.biz udp
US 8.8.8.8:53 nexuspk.com udp
US 173.0.56.154:80 nexuspk.com tcp
US 173.0.56.154:80 nexuspk.com tcp
US 8.8.8.8:53 rsdumps.org udp
US 8.8.8.8:53 rsbot.biz udp
US 173.0.56.154:80 nexuspk.com tcp
US 8.8.8.8:53 rsdumps.org udp
US 8.8.8.8:53 rsbot.biz udp
US 173.0.56.154:80 nexuspk.com tcp
US 8.8.8.8:53 rsdumps.org udp
US 8.8.8.8:53 rsbot.biz udp
US 173.0.56.154:80 nexuspk.com tcp
US 8.8.8.8:53 rsdumps.org udp
US 8.8.8.8:53 rsbot.biz udp
US 173.0.56.154:80 nexuspk.com tcp
US 8.8.8.8:53 rsdumps.org udp
US 8.8.8.8:53 rsbot.biz udp
US 173.0.56.154:80 nexuspk.com tcp
US 8.8.8.8:53 rsdumps.org udp
US 8.8.8.8:53 rsbot.biz udp
US 173.0.56.154:80 nexuspk.com tcp
US 8.8.8.8:53 rsdumps.org udp
US 8.8.8.8:53 rsbot.biz udp
US 173.0.56.154:80 nexuspk.com tcp
US 8.8.8.8:53 rsdumps.org udp
US 8.8.8.8:53 rsbot.biz udp
US 173.0.56.154:80 nexuspk.com tcp
US 8.8.8.8:53 rsdumps.org udp
US 8.8.8.8:53 rsbot.biz udp
US 173.0.56.154:80 nexuspk.com tcp
US 8.8.8.8:53 rsdumps.org udp
US 8.8.8.8:53 rsbot.biz udp
US 173.0.56.154:80 nexuspk.com tcp

Files

memory/232-0-0x0000000000400000-0x0000000000431000-memory.dmp

memory/2920-4-0x0000000000400000-0x000000000054D000-memory.dmp

memory/232-5-0x0000000000400000-0x0000000000431000-memory.dmp

memory/2920-3-0x0000000000400000-0x000000000054D000-memory.dmp

memory/2920-6-0x0000000000400000-0x000000000054D000-memory.dmp

memory/2920-7-0x0000000000400000-0x000000000054D000-memory.dmp

memory/2920-12-0x0000000000400000-0x000000000054D000-memory.dmp

memory/2920-13-0x0000000000400000-0x000000000054D000-memory.dmp

C:\Users\Admin\AppData\Local\Temp\5g5hspcdw7g.exe.jpg

MD5 0875ca39c874289d82bab473897ffb7c
SHA1 26080d593c21fbc3275a389057e22fdd07024209
SHA256 638f714836e4a7f98e54d185afd717ccf1d75293c5c0b23e3f3bd5a09d5b3fe1
SHA512 d64d782102abc9061af8bccdf714433225614d7060c9dc055273273cad92298d67dffc7773673565b92571fbad0fcef855edd565115e53849a9204ef195a73c8

memory/2920-34-0x0000000000400000-0x000000000054D000-memory.dmp

memory/2920-53-0x0000000000400000-0x000000000054D000-memory.dmp