vobfus | 638f714836e4a7f98e54d185afd717ccf1d75293c5c0b23e3f3bd5a09d5b3fe1

General

Target

JaffaCakes118_0875ca39c874289d82bab473897ffb7c.exe
Size

143KB
MD5

0875ca39c874289d82bab473897ffb7c
SHA1

26080d593c21fbc3275a389057e22fdd07024209
SHA256

638f714836e4a7f98e54d185afd717ccf1d75293c5c0b23e3f3bd5a09d5b3fe1
SHA512

d64d782102abc9061af8bccdf714433225614d7060c9dc055273273cad92298d67dffc7773673565b92571fbad0fcef855edd565115e53849a9204ef195a73c8
SSDEEP

3072:SZpDghasdeTqqhsssjdddd2E9rWHSq/TyMGW830zN:0M5deTqqSdzqGdW83EN

Score

10^/10

vobfus discovery persistence upx worm

Malware Config

Signatures

Vobfus
A widespread worm which spreads via network drives and removable media.
worm vobfus
Vobfus family
vobfus

Adds policy Run key to start application 2 TTPs 4 IoCs

persistence

Registry Run Keys / Startup Folder

T1547.001

Modify Registry

T1112

description	ioc	Process
Key created	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\Explorer\run	JaffaCakes118_0875ca39c874289d82bab473897ffb7c.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\Explorer\run\9ZOK0LE4KJ3SJ = "C:\\Users\\Admin\\AppData\\Roaming\\5G5HSPCDW7G.exe"	JaffaCakes118_0875ca39c874289d82bab473897ffb7c.exe
Key created	\REGISTRY\USER\S-1-5-21-3181990009-820930284-137514597-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\policies\Explorer\run	JaffaCakes118_0875ca39c874289d82bab473897ffb7c.exe
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"	JaffaCakes118_0875ca39c874289d82bab473897ffb7c.exe

Adds Run key to start application 2 TTPs 2 IoCs

persistence

Registry Run Keys / Startup Folder

T1547.001

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows\CurrentVersion\Run\9ZOK0LE4KJ3SJ = "C:\\Users\\Admin\\AppData\\Roaming\\5G5HSPCDW7G.exe"	JaffaCakes118_0875ca39c874289d82bab473897ffb7c.exe
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"	JaffaCakes118_0875ca39c874289d82bab473897ffb7c.exe

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 232 set thread context of 2920	232	JaffaCakes118_0875ca39c874289d82bab473897ffb7c.exe	89

UPX packed file 8 IoCs

Detects executables packed with UPX/modified UPX open source packer.

upx

resource	yara_rule
behavioral2/memory/2920-4-0x0000000000400000-0x000000000054D000-memory.dmp	upx
behavioral2/memory/2920-3-0x0000000000400000-0x000000000054D000-memory.dmp	upx
behavioral2/memory/2920-6-0x0000000000400000-0x000000000054D000-memory.dmp	upx
behavioral2/memory/2920-7-0x0000000000400000-0x000000000054D000-memory.dmp	upx
behavioral2/memory/2920-12-0x0000000000400000-0x000000000054D000-memory.dmp	upx
behavioral2/memory/2920-13-0x0000000000400000-0x000000000054D000-memory.dmp	upx
behavioral2/memory/2920-34-0x0000000000400000-0x000000000054D000-memory.dmp	upx
behavioral2/memory/2920-53-0x0000000000400000-0x000000000054D000-memory.dmp	upx

System Location Discovery: System Language Discovery 1 TTPs 2 IoCs

Attempt gather information about the system language of a victim in order to infer the geographical location of that host.

discovery

System Language Discovery

T1614.001

description	ioc	Process
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	JaffaCakes118_0875ca39c874289d82bab473897ffb7c.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	JaffaCakes118_0875ca39c874289d82bab473897ffb7c.exe

Script User-Agent 4 IoCs

Uses user-agent string associated with script host/environment.

description	flow	ioc
HTTP User-Agent header	29	Mozilla/4.0 (compatible; Win32; WinHttp.WinHttpRequest.5)
HTTP User-Agent header	21	Mozilla/4.0 (compatible; Win32; WinHttp.WinHttpRequest.5)
HTTP User-Agent header	22	Mozilla/4.0 (compatible; Win32; WinHttp.WinHttpRequest.5)
HTTP User-Agent header	26	Mozilla/4.0 (compatible; Win32; WinHttp.WinHttpRequest.5)

Suspicious behavior: RenamesItself 1 IoCs

pid	Process
2920	JaffaCakes118_0875ca39c874289d82bab473897ffb7c.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
2920	JaffaCakes118_0875ca39c874289d82bab473897ffb7c.exe

Suspicious use of WriteProcessMemory 7 IoCs

description	pid	Process	procid_target
PID 232 wrote to memory of 2920	232	JaffaCakes118_0875ca39c874289d82bab473897ffb7c.exe	89
PID 232 wrote to memory of 2920	232	JaffaCakes118_0875ca39c874289d82bab473897ffb7c.exe	89
PID 232 wrote to memory of 2920	232	JaffaCakes118_0875ca39c874289d82bab473897ffb7c.exe	89
PID 232 wrote to memory of 2920	232	JaffaCakes118_0875ca39c874289d82bab473897ffb7c.exe	89
PID 232 wrote to memory of 2920	232	JaffaCakes118_0875ca39c874289d82bab473897ffb7c.exe	89
PID 232 wrote to memory of 2920	232	JaffaCakes118_0875ca39c874289d82bab473897ffb7c.exe	89
PID 232 wrote to memory of 2920	232	JaffaCakes118_0875ca39c874289d82bab473897ffb7c.exe	89

C:\Users\Admin\AppData\Local\Temp\JaffaCakes118_0875ca39c874289d82bab473897ffb7c.exe
"C:\Users\Admin\AppData\Local\Temp\JaffaCakes118_0875ca39c874289d82bab473897ffb7c.exe"
1⤵
- Suspicious use of SetThreadContext
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:232
- C:\Users\Admin\AppData\Local\Temp\JaffaCakes118_0875ca39c874289d82bab473897ffb7c.exe
  C:\Users\Admin\AppData\Local\Temp\JaffaCakes118_0875ca39c874289d82bab473897ffb7c.exe
  2⤵
  - Adds policy Run key to start application
  - Adds Run key to start application
  - System Location Discovery: System Language Discovery
  - Suspicious behavior: RenamesItself
  - Suspicious use of SetWindowsHookEx
  PID:2920

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Boot or Logon Autostart Execution

2

T1547

Registry Run Keys / Startup Folder

2

T1547.001

Privilege Escalation

Boot or Logon Autostart Execution

2

T1547

Registry Run Keys / Startup Folder

2

T1547.001

Defense Evasion

Modify Registry

2

T1112

Credential Access

Discovery

System Location Discovery

1

T1614

System Language Discovery

1

T1614.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

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

Filesize
143KB

MD5
0875ca39c874289d82bab473897ffb7c

SHA1
26080d593c21fbc3275a389057e22fdd07024209

SHA256
638f714836e4a7f98e54d185afd717ccf1d75293c5c0b23e3f3bd5a09d5b3fe1

SHA512
d64d782102abc9061af8bccdf714433225614d7060c9dc055273273cad92298d67dffc7773673565b92571fbad0fcef855edd565115e53849a9204ef195a73c8

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

Filesize
196KB

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

Filesize
196KB

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

Filesize
1.3MB

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

Filesize
1.3MB

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

Filesize
1.3MB

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

Filesize
1.3MB

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

Filesize
1.3MB

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

Filesize
1.3MB

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

Filesize
1.3MB

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

Filesize
1.3MB

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads