vobfus | cf759a77457cf5a91d88d30039b5897b3ebac75a988cbe3b20d0b1f6817d9a20

General

Target

bc1473aeb953272cba0f03a8562bc80c_JaffaCakes118.exe
Size

188KB
MD5

bc1473aeb953272cba0f03a8562bc80c
SHA1

66e52561258d8d0e9f272a145f08eb493a93e2b8
SHA256

cf759a77457cf5a91d88d30039b5897b3ebac75a988cbe3b20d0b1f6817d9a20
SHA512

d36241044d72408db792b3cfb0cb1ea17f36ae838950f969071531eb7192f53300377b6283e9481c0608e4f479619506f8a721b5bd83eea3080a7241944ada7e
SSDEEP

3072:wEQPoi0BCAt56cnnVHy2aamOTVeOop9Ug0BkdgRM7tkgAH8U8HfQAsr:wEti0Q06iVHVaamOT3opxmkTAH8Xs

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	bc1473aeb953272cba0f03a8562bc80c_JaffaCakes118.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\Explorer\run\NKRY12LW45IMP = "C:\\Users\\Admin\\AppData\\Roaming\\J18VS5J5.exe"	bc1473aeb953272cba0f03a8562bc80c_JaffaCakes118.exe
Key created	\REGISTRY\USER\S-1-5-21-1194130065-3471212556-1656947724-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\policies\Explorer\run	bc1473aeb953272cba0f03a8562bc80c_JaffaCakes118.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-1194130065-3471212556-1656947724-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\Explorer\run\NKRY12LW45IMP = "C:\\Users\\Admin\\AppData\\Roaming\\J18VS5J5.exe"	bc1473aeb953272cba0f03a8562bc80c_JaffaCakes118.exe

UPX packed file 6 IoCs

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

upx

resource	yara_rule
behavioral2/memory/224-0-0x0000000000400000-0x0000000000437000-memory.dmp	upx
behavioral2/memory/224-2-0x0000000000400000-0x0000000000437000-memory.dmp	upx
behavioral2/memory/224-4-0x0000000000400000-0x0000000000437000-memory.dmp	upx
behavioral2/memory/224-9-0x0000000000400000-0x0000000000437000-memory.dmp	upx
behavioral2/memory/224-11-0x0000000000400000-0x0000000000437000-memory.dmp	upx
behavioral2/memory/224-31-0x0000000000400000-0x0000000000437000-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"	bc1473aeb953272cba0f03a8562bc80c_JaffaCakes118.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-1194130065-3471212556-1656947724-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\NKRY12LW45IMP = "C:\\Users\\Admin\\AppData\\Roaming\\J18VS5J5.exe"	bc1473aeb953272cba0f03a8562bc80c_JaffaCakes118.exe

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 536 set thread context of 224	536	bc1473aeb953272cba0f03a8562bc80c_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	bc1473aeb953272cba0f03a8562bc80c_JaffaCakes118.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	bc1473aeb953272cba0f03a8562bc80c_JaffaCakes118.exe

Script User-Agent 4 IoCs

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

description	flow	ioc
HTTP User-Agent header	40	Mozilla/4.0 (compatible; Win32; WinHttp.WinHttpRequest.5)
HTTP User-Agent header	57	Mozilla/4.0 (compatible; Win32; WinHttp.WinHttpRequest.5)
HTTP User-Agent header	58	Mozilla/4.0 (compatible; Win32; WinHttp.WinHttpRequest.5)
HTTP User-Agent header	39	Mozilla/4.0 (compatible; Win32; WinHttp.WinHttpRequest.5)

Suspicious behavior: GetForegroundWindowSpam 1 IoCs

pid	Process
224	bc1473aeb953272cba0f03a8562bc80c_JaffaCakes118.exe

Suspicious behavior: RenamesItself 1 IoCs

pid	Process
224	bc1473aeb953272cba0f03a8562bc80c_JaffaCakes118.exe

Suspicious use of SetWindowsHookEx 2 IoCs

pid	Process
224	bc1473aeb953272cba0f03a8562bc80c_JaffaCakes118.exe
224	bc1473aeb953272cba0f03a8562bc80c_JaffaCakes118.exe

Suspicious use of WriteProcessMemory 8 IoCs

description	pid	Process	procid_target
PID 536 wrote to memory of 224	536	bc1473aeb953272cba0f03a8562bc80c_JaffaCakes118.exe	87
PID 536 wrote to memory of 224	536	bc1473aeb953272cba0f03a8562bc80c_JaffaCakes118.exe	87
PID 536 wrote to memory of 224	536	bc1473aeb953272cba0f03a8562bc80c_JaffaCakes118.exe	87
PID 536 wrote to memory of 224	536	bc1473aeb953272cba0f03a8562bc80c_JaffaCakes118.exe	87
PID 536 wrote to memory of 224	536	bc1473aeb953272cba0f03a8562bc80c_JaffaCakes118.exe	87
PID 536 wrote to memory of 224	536	bc1473aeb953272cba0f03a8562bc80c_JaffaCakes118.exe	87
PID 536 wrote to memory of 224	536	bc1473aeb953272cba0f03a8562bc80c_JaffaCakes118.exe	87
PID 536 wrote to memory of 224	536	bc1473aeb953272cba0f03a8562bc80c_JaffaCakes118.exe	87

C:\Users\Admin\AppData\Local\Temp\bc1473aeb953272cba0f03a8562bc80c_JaffaCakes118.exe
"C:\Users\Admin\AppData\Local\Temp\bc1473aeb953272cba0f03a8562bc80c_JaffaCakes118.exe"
1⤵
- Suspicious use of SetThreadContext
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:536
- C:\Users\Admin\AppData\Local\Temp\bc1473aeb953272cba0f03a8562bc80c_JaffaCakes118.exe
  "C:\Users\Admin\AppData\Local\Temp\bc1473aeb953272cba0f03a8562bc80c_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:224

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
188KB

MD5
bc1473aeb953272cba0f03a8562bc80c

SHA1
66e52561258d8d0e9f272a145f08eb493a93e2b8

SHA256
cf759a77457cf5a91d88d30039b5897b3ebac75a988cbe3b20d0b1f6817d9a20

SHA512
d36241044d72408db792b3cfb0cb1ea17f36ae838950f969071531eb7192f53300377b6283e9481c0608e4f479619506f8a721b5bd83eea3080a7241944ada7e

Download Submit
memory/224-0-0x0000000000400000-0x0000000000437000-memory.dmp

Filesize
220KB

Download
memory/224-2-0x0000000000400000-0x0000000000437000-memory.dmp

Filesize
220KB

Download
memory/224-4-0x0000000000400000-0x0000000000437000-memory.dmp

Filesize
220KB

Download
memory/224-9-0x0000000000400000-0x0000000000437000-memory.dmp

Filesize
220KB

Download
memory/224-11-0x0000000000400000-0x0000000000437000-memory.dmp

Filesize
220KB

Download
memory/224-31-0x0000000000400000-0x0000000000437000-memory.dmp

Filesize
220KB

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads