vobfus | efde3e426cab9404af4c3856040c33596ceb47a8a91cabc52f4c8fa3571b839c

General

Target

a7db85b87d77ef7b8a08d1498cc0184e_JaffaCakes118.exe
Size

184KB
MD5

a7db85b87d77ef7b8a08d1498cc0184e
SHA1

c8890496a6506dd1aa9d80e1f01a2526707bcb4d
SHA256

efde3e426cab9404af4c3856040c33596ceb47a8a91cabc52f4c8fa3571b839c
SHA512

923863a2886441c2aa2dda0726fe63b3dc81c0dde775057e30f47ad0fed795a7f55f3629e689e519ff5d54646fade4d48ca624d78dadf48c67bc3e45221cfd33
SSDEEP

3072:NXCkF+Zp9uDlt6fchd16dD8PCZZ72kikVxPaIFd:hSWIn7VxPaI

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

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	a7db85b87d77ef7b8a08d1498cc0184e_JaffaCakes118.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\Explorer\run\NKRY12LW45IMP = "C:\\Users\\Admin\\AppData\\Roaming\\J18VS5J5.exe"	a7db85b87d77ef7b8a08d1498cc0184e_JaffaCakes118.exe
Key created	\REGISTRY\USER\S-1-5-21-786284298-625481688-3210388970-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\policies\Explorer\run	a7db85b87d77ef7b8a08d1498cc0184e_JaffaCakes118.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-786284298-625481688-3210388970-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\Explorer\run\NKRY12LW45IMP = "C:\\Users\\Admin\\AppData\\Roaming\\J18VS5J5.exe"	a7db85b87d77ef7b8a08d1498cc0184e_JaffaCakes118.exe

UPX packed file 6 IoCs

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

upx

resource	yara_rule
behavioral2/memory/1156-0-0x0000000000400000-0x0000000000437000-memory.dmp	upx
behavioral2/memory/1156-2-0x0000000000400000-0x0000000000437000-memory.dmp	upx
behavioral2/memory/1156-4-0x0000000000400000-0x0000000000437000-memory.dmp	upx
behavioral2/memory/1156-9-0x0000000000400000-0x0000000000437000-memory.dmp	upx
behavioral2/memory/1156-10-0x0000000000400000-0x0000000000437000-memory.dmp	upx
behavioral2/memory/1156-18-0x0000000000400000-0x0000000000437000-memory.dmp	upx

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\NKRY12LW45IMP = "C:\\Users\\Admin\\AppData\\Roaming\\J18VS5J5.exe"	a7db85b87d77ef7b8a08d1498cc0184e_JaffaCakes118.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-786284298-625481688-3210388970-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\NKRY12LW45IMP = "C:\\Users\\Admin\\AppData\\Roaming\\J18VS5J5.exe"	a7db85b87d77ef7b8a08d1498cc0184e_JaffaCakes118.exe

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 220 set thread context of 1156	220	a7db85b87d77ef7b8a08d1498cc0184e_JaffaCakes118.exe	87

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	a7db85b87d77ef7b8a08d1498cc0184e_JaffaCakes118.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	a7db85b87d77ef7b8a08d1498cc0184e_JaffaCakes118.exe

Script User-Agent 4 IoCs

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

description	flow	ioc
HTTP User-Agent header	33	Mozilla/4.0 (compatible; Win32; WinHttp.WinHttpRequest.5)
HTTP User-Agent header	34	Mozilla/4.0 (compatible; Win32; WinHttp.WinHttpRequest.5)
HTTP User-Agent header	51	Mozilla/4.0 (compatible; Win32; WinHttp.WinHttpRequest.5)
HTTP User-Agent header	52	Mozilla/4.0 (compatible; Win32; WinHttp.WinHttpRequest.5)

Suspicious behavior: GetForegroundWindowSpam 1 IoCs

pid	Process
1156	a7db85b87d77ef7b8a08d1498cc0184e_JaffaCakes118.exe

Suspicious behavior: RenamesItself 1 IoCs

pid	Process
1156	a7db85b87d77ef7b8a08d1498cc0184e_JaffaCakes118.exe

Suspicious use of SetWindowsHookEx 2 IoCs

pid	Process
1156	a7db85b87d77ef7b8a08d1498cc0184e_JaffaCakes118.exe
1156	a7db85b87d77ef7b8a08d1498cc0184e_JaffaCakes118.exe

Suspicious use of WriteProcessMemory 8 IoCs

description	pid	Process	procid_target
PID 220 wrote to memory of 1156	220	a7db85b87d77ef7b8a08d1498cc0184e_JaffaCakes118.exe	87
PID 220 wrote to memory of 1156	220	a7db85b87d77ef7b8a08d1498cc0184e_JaffaCakes118.exe	87
PID 220 wrote to memory of 1156	220	a7db85b87d77ef7b8a08d1498cc0184e_JaffaCakes118.exe	87
PID 220 wrote to memory of 1156	220	a7db85b87d77ef7b8a08d1498cc0184e_JaffaCakes118.exe	87
PID 220 wrote to memory of 1156	220	a7db85b87d77ef7b8a08d1498cc0184e_JaffaCakes118.exe	87
PID 220 wrote to memory of 1156	220	a7db85b87d77ef7b8a08d1498cc0184e_JaffaCakes118.exe	87
PID 220 wrote to memory of 1156	220	a7db85b87d77ef7b8a08d1498cc0184e_JaffaCakes118.exe	87
PID 220 wrote to memory of 1156	220	a7db85b87d77ef7b8a08d1498cc0184e_JaffaCakes118.exe	87

C:\Users\Admin\AppData\Local\Temp\a7db85b87d77ef7b8a08d1498cc0184e_JaffaCakes118.exe
"C:\Users\Admin\AppData\Local\Temp\a7db85b87d77ef7b8a08d1498cc0184e_JaffaCakes118.exe"
1⤵
- Suspicious use of SetThreadContext
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:220
- C:\Users\Admin\AppData\Local\Temp\a7db85b87d77ef7b8a08d1498cc0184e_JaffaCakes118.exe
  "C:\Users\Admin\AppData\Local\Temp\a7db85b87d77ef7b8a08d1498cc0184e_JaffaCakes118.exe"
  2⤵
  - Adds policy Run key to start application
  - Adds Run key to start application
  - System Location Discovery: System Language Discovery
  - Suspicious behavior: GetForegroundWindowSpam
  - Suspicious behavior: RenamesItself
  - Suspicious use of SetWindowsHookEx
  PID:1156

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\j18vs5j5.exe.jpg

Filesize
184KB

MD5
a7db85b87d77ef7b8a08d1498cc0184e

SHA1
c8890496a6506dd1aa9d80e1f01a2526707bcb4d

SHA256
efde3e426cab9404af4c3856040c33596ceb47a8a91cabc52f4c8fa3571b839c

SHA512
923863a2886441c2aa2dda0726fe63b3dc81c0dde775057e30f47ad0fed795a7f55f3629e689e519ff5d54646fade4d48ca624d78dadf48c67bc3e45221cfd33

Download Submit
memory/1156-0-0x0000000000400000-0x0000000000437000-memory.dmp

Filesize
220KB

Download
memory/1156-2-0x0000000000400000-0x0000000000437000-memory.dmp

Filesize
220KB

Download
memory/1156-4-0x0000000000400000-0x0000000000437000-memory.dmp

Filesize
220KB

Download
memory/1156-9-0x0000000000400000-0x0000000000437000-memory.dmp

Filesize
220KB

Download
memory/1156-10-0x0000000000400000-0x0000000000437000-memory.dmp

Filesize
220KB

Download
memory/1156-18-0x0000000000400000-0x0000000000437000-memory.dmp

Filesize
220KB

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads