vobfus | 6b1bdfe57d11f4df137765a6ffea0c4a1b6591002309382873bba1f5fdbd3eef

General

Target

b912c77c6b5165936068911c9b75f7fe_JaffaCakes118.exe
Size

188KB
MD5

b912c77c6b5165936068911c9b75f7fe
SHA1

dc6aa78dfa68773cd342d41b8fbeb7fa4af38d96
SHA256

6b1bdfe57d11f4df137765a6ffea0c4a1b6591002309382873bba1f5fdbd3eef
SHA512

e1f71e81d8b75ddc1e1d9a4737918662229bf58ad767a9c634ce28e71bd881deded6dc07e085413401fbc413ba70b474ee36094ae7c6b368bed4b4f4ce6702d5
SSDEEP

3072:+wP30Vx16GfDtSvznFT8nCvp5c6fdkBBb5fqN8x/xiNBL7kYDCRPov71dU7bkE:gVx16GfDtIt8nCRRfdk397x/wNBItRPj

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	b912c77c6b5165936068911c9b75f7fe_JaffaCakes118.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\Explorer\run\Windows Update = "C:\\Users\\Admin\\AppData\\Roaming\\dwm.exe"	b912c77c6b5165936068911c9b75f7fe_JaffaCakes118.exe
Key created	\REGISTRY\USER\S-1-5-21-656926755-4116854191-210765258-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\policies\Explorer\run	b912c77c6b5165936068911c9b75f7fe_JaffaCakes118.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-656926755-4116854191-210765258-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\Explorer\run\Windows Update = "C:\\Users\\Admin\\AppData\\Roaming\\dwm.exe"	b912c77c6b5165936068911c9b75f7fe_JaffaCakes118.exe

UPX packed file 5 IoCs

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

upx

resource	yara_rule
behavioral2/memory/1072-2-0x0000000000400000-0x000000000042C000-memory.dmp	upx
behavioral2/memory/1072-4-0x0000000000400000-0x000000000042C000-memory.dmp	upx
behavioral2/memory/1072-6-0x0000000000400000-0x000000000042C000-memory.dmp	upx
behavioral2/memory/1072-13-0x0000000000400000-0x000000000042C000-memory.dmp	upx
behavioral2/memory/1072-147-0x0000000000400000-0x000000000042C000-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\Windows Update = "C:\\Users\\Admin\\AppData\\Roaming\\dwm.exe"	b912c77c6b5165936068911c9b75f7fe_JaffaCakes118.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-656926755-4116854191-210765258-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\Windows Update = "C:\\Users\\Admin\\AppData\\Roaming\\dwm.exe"	b912c77c6b5165936068911c9b75f7fe_JaffaCakes118.exe

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 2344 set thread context of 1072	2344	b912c77c6b5165936068911c9b75f7fe_JaffaCakes118.exe	84

System Location Discovery: System Language Discovery 1 TTPs 3 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	b912c77c6b5165936068911c9b75f7fe_JaffaCakes118.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	b912c77c6b5165936068911c9b75f7fe_JaffaCakes118.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	regsvr32.exe

Script User-Agent 2 IoCs

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

description	flow	ioc
HTTP User-Agent header	50	Mozilla/4.0 (compatible; Win32; WinHttp.WinHttpRequest.5)
HTTP User-Agent header	24	Mozilla/4.0 (compatible; Win32; WinHttp.WinHttpRequest.5)

Suspicious behavior: RenamesItself 1 IoCs

pid	Process
1072	b912c77c6b5165936068911c9b75f7fe_JaffaCakes118.exe

Suspicious use of SetWindowsHookEx 2 IoCs

pid	Process
2344	b912c77c6b5165936068911c9b75f7fe_JaffaCakes118.exe
1072	b912c77c6b5165936068911c9b75f7fe_JaffaCakes118.exe

Suspicious use of WriteProcessMemory 12 IoCs

description	pid	Process	procid_target
PID 2344 wrote to memory of 1072	2344	b912c77c6b5165936068911c9b75f7fe_JaffaCakes118.exe	84
PID 2344 wrote to memory of 1072	2344	b912c77c6b5165936068911c9b75f7fe_JaffaCakes118.exe	84
PID 2344 wrote to memory of 1072	2344	b912c77c6b5165936068911c9b75f7fe_JaffaCakes118.exe	84
PID 2344 wrote to memory of 1072	2344	b912c77c6b5165936068911c9b75f7fe_JaffaCakes118.exe	84
PID 2344 wrote to memory of 1072	2344	b912c77c6b5165936068911c9b75f7fe_JaffaCakes118.exe	84
PID 2344 wrote to memory of 1072	2344	b912c77c6b5165936068911c9b75f7fe_JaffaCakes118.exe	84
PID 2344 wrote to memory of 1072	2344	b912c77c6b5165936068911c9b75f7fe_JaffaCakes118.exe	84
PID 2344 wrote to memory of 1072	2344	b912c77c6b5165936068911c9b75f7fe_JaffaCakes118.exe	84
PID 2344 wrote to memory of 1072	2344	b912c77c6b5165936068911c9b75f7fe_JaffaCakes118.exe	84
PID 1072 wrote to memory of 632	1072	b912c77c6b5165936068911c9b75f7fe_JaffaCakes118.exe	100
PID 1072 wrote to memory of 632	1072	b912c77c6b5165936068911c9b75f7fe_JaffaCakes118.exe	100
PID 1072 wrote to memory of 632	1072	b912c77c6b5165936068911c9b75f7fe_JaffaCakes118.exe	100

C:\Users\Admin\AppData\Local\Temp\b912c77c6b5165936068911c9b75f7fe_JaffaCakes118.exe
"C:\Users\Admin\AppData\Local\Temp\b912c77c6b5165936068911c9b75f7fe_JaffaCakes118.exe"
1⤵
- Suspicious use of SetThreadContext
- System Location Discovery: System Language Discovery
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:2344
- C:\Users\Admin\AppData\Local\Temp\b912c77c6b5165936068911c9b75f7fe_JaffaCakes118.exe
  C:\Users\Admin\AppData\Local\Temp\b912c77c6b5165936068911c9b75f7fe_JaffaCakes118.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
  - Suspicious use of WriteProcessMemory
  PID:1072
- - C:\Windows\SysWOW64\regsvr32.exe
    regsvr32.exe "C:\Users\Admin\AppData\Local\Temp\MSWINSCK.OCX" /s
    3⤵
    - System Location Discovery: System Language Discovery
    PID:632

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\MSWINSCK.OCX

Filesize
15KB

MD5
9831d56f861601f50b8e97eae97c4f3b

SHA1
a08a888b7b0ab157740c450c10ae87e32dec8ba7

SHA256
d08c94f834d5b1c9ec3c2f6572d1a412cbe377ea60ea68d61e2bb4ad6437ad52

SHA512
4055147ac2633434bcb0ed1a14f7a446c9da633de6fd2e25257cd09a73a82aa2ab554ab3a2c5b5a65e04067810884789215aca4cc6dd57344a8ebb3529263fbb

Download Submit
C:\Users\Admin\AppData\Local\Temp\dwm.exe.jpg

Filesize
188KB

MD5
b912c77c6b5165936068911c9b75f7fe

SHA1
dc6aa78dfa68773cd342d41b8fbeb7fa4af38d96

SHA256
6b1bdfe57d11f4df137765a6ffea0c4a1b6591002309382873bba1f5fdbd3eef

SHA512
e1f71e81d8b75ddc1e1d9a4737918662229bf58ad767a9c634ce28e71bd881deded6dc07e085413401fbc413ba70b474ee36094ae7c6b368bed4b4f4ce6702d5

Download Submit
memory/1072-2-0x0000000000400000-0x000000000042C000-memory.dmp

Filesize
176KB

Download
memory/1072-4-0x0000000000400000-0x000000000042C000-memory.dmp

Filesize
176KB

Download
memory/1072-6-0x0000000000400000-0x000000000042C000-memory.dmp

Filesize
176KB

Download
memory/1072-13-0x0000000000400000-0x000000000042C000-memory.dmp

Filesize
176KB

Download
memory/1072-147-0x0000000000400000-0x000000000042C000-memory.dmp

Filesize
176KB

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads