vobfus | 9e49226fd69efdbc05a3e9fdc705acfb87e2020cef3a039086778290babc19e6

General

Target

JaffaCakes118_41196c8ab31e3db84dd90bb5a36fa1b0.exe
Size

177KB
MD5

41196c8ab31e3db84dd90bb5a36fa1b0
SHA1

01c8c093407d906247419986e4dc6aafce425cec
SHA256

9e49226fd69efdbc05a3e9fdc705acfb87e2020cef3a039086778290babc19e6
SHA512

dc360f150af0bf79e544231b96a56959aaccefdfd1fac177fcccf182ec771846aca6c67ba7e4482ff259525e297679b10903893238e3dc5d6230a973d4b0a7d7
SSDEEP

3072:AFdsCwslUnTXSQDQyDiD7FtCUyu06enr2PHTn7v4ZuafBYlW2dKblVout14:uJwslUnjRDWtCUyGMrwH7OfyfcblVoSy

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_41196c8ab31e3db84dd90bb5a36fa1b0.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\Explorer\run\WindowsDefender = "C:\\Users\\Admin\\AppData\\Roaming\\windefender.exe"	JaffaCakes118_41196c8ab31e3db84dd90bb5a36fa1b0.exe
Key created	\REGISTRY\USER\S-1-5-21-925314154-1797147466-1467878628-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\policies\Explorer\run	JaffaCakes118_41196c8ab31e3db84dd90bb5a36fa1b0.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-925314154-1797147466-1467878628-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\Explorer\run\WindowsDefender = "C:\\Users\\Admin\\AppData\\Roaming\\windefender.exe"	JaffaCakes118_41196c8ab31e3db84dd90bb5a36fa1b0.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\WindowsDefender = "C:\\Users\\Admin\\AppData\\Roaming\\windefender.exe"	JaffaCakes118_41196c8ab31e3db84dd90bb5a36fa1b0.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-925314154-1797147466-1467878628-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\WindowsDefender = "C:\\Users\\Admin\\AppData\\Roaming\\windefender.exe"	JaffaCakes118_41196c8ab31e3db84dd90bb5a36fa1b0.exe

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 5088 set thread context of 3788	5088	JaffaCakes118_41196c8ab31e3db84dd90bb5a36fa1b0.exe	87

UPX packed file 7 IoCs

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

upx

resource	yara_rule
behavioral2/memory/5088-0-0x0000000000400000-0x000000000054D000-memory.dmp	upx
behavioral2/memory/3788-3-0x0000000000400000-0x0000000000431000-memory.dmp	upx
behavioral2/memory/3788-5-0x0000000000400000-0x0000000000431000-memory.dmp	upx
behavioral2/memory/3788-7-0x0000000000400000-0x0000000000431000-memory.dmp	upx
behavioral2/memory/5088-11-0x0000000000400000-0x000000000054D000-memory.dmp	upx
behavioral2/memory/3788-14-0x0000000000400000-0x0000000000431000-memory.dmp	upx
behavioral2/files/0x000d000000023bca-18.dat	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_41196c8ab31e3db84dd90bb5a36fa1b0.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	JaffaCakes118_41196c8ab31e3db84dd90bb5a36fa1b0.exe

Script User-Agent 4 IoCs

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

description	flow	ioc
HTTP User-Agent header	34	Mozilla/4.0 (compatible; Win32; WinHttp.WinHttpRequest.5)
HTTP User-Agent header	72	Mozilla/4.0 (compatible; Win32; WinHttp.WinHttpRequest.5)
HTTP User-Agent header	73	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
3788	JaffaCakes118_41196c8ab31e3db84dd90bb5a36fa1b0.exe

Suspicious use of SetWindowsHookEx 2 IoCs

pid	Process
5088	JaffaCakes118_41196c8ab31e3db84dd90bb5a36fa1b0.exe
3788	JaffaCakes118_41196c8ab31e3db84dd90bb5a36fa1b0.exe

Suspicious use of WriteProcessMemory 8 IoCs

description	pid	Process	procid_target
PID 5088 wrote to memory of 3788	5088	JaffaCakes118_41196c8ab31e3db84dd90bb5a36fa1b0.exe	87
PID 5088 wrote to memory of 3788	5088	JaffaCakes118_41196c8ab31e3db84dd90bb5a36fa1b0.exe	87
PID 5088 wrote to memory of 3788	5088	JaffaCakes118_41196c8ab31e3db84dd90bb5a36fa1b0.exe	87
PID 5088 wrote to memory of 3788	5088	JaffaCakes118_41196c8ab31e3db84dd90bb5a36fa1b0.exe	87
PID 5088 wrote to memory of 3788	5088	JaffaCakes118_41196c8ab31e3db84dd90bb5a36fa1b0.exe	87
PID 5088 wrote to memory of 3788	5088	JaffaCakes118_41196c8ab31e3db84dd90bb5a36fa1b0.exe	87
PID 5088 wrote to memory of 3788	5088	JaffaCakes118_41196c8ab31e3db84dd90bb5a36fa1b0.exe	87
PID 5088 wrote to memory of 3788	5088	JaffaCakes118_41196c8ab31e3db84dd90bb5a36fa1b0.exe	87

C:\Users\Admin\AppData\Local\Temp\JaffaCakes118_41196c8ab31e3db84dd90bb5a36fa1b0.exe
"C:\Users\Admin\AppData\Local\Temp\JaffaCakes118_41196c8ab31e3db84dd90bb5a36fa1b0.exe"
1⤵
- Suspicious use of SetThreadContext
- System Location Discovery: System Language Discovery
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:5088
- C:\Users\Admin\AppData\Local\Temp\JaffaCakes118_41196c8ab31e3db84dd90bb5a36fa1b0.exe
  "C:\Users\Admin\AppData\Local\Temp\JaffaCakes118_41196c8ab31e3db84dd90bb5a36fa1b0.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:3788

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\windefender.exe.jpg

Filesize
177KB

MD5
41196c8ab31e3db84dd90bb5a36fa1b0

SHA1
01c8c093407d906247419986e4dc6aafce425cec

SHA256
9e49226fd69efdbc05a3e9fdc705acfb87e2020cef3a039086778290babc19e6

SHA512
dc360f150af0bf79e544231b96a56959aaccefdfd1fac177fcccf182ec771846aca6c67ba7e4482ff259525e297679b10903893238e3dc5d6230a973d4b0a7d7

Download Submit
memory/3788-3-0x0000000000400000-0x0000000000431000-memory.dmp

Filesize
196KB

Download
memory/3788-5-0x0000000000400000-0x0000000000431000-memory.dmp

Filesize
196KB

Download
memory/3788-7-0x0000000000400000-0x0000000000431000-memory.dmp

Filesize
196KB

Download
memory/3788-14-0x0000000000400000-0x0000000000431000-memory.dmp

Filesize
196KB

Download
memory/5088-0-0x0000000000400000-0x000000000054D000-memory.dmp

Filesize
1.3MB

Download
memory/5088-11-0x0000000000400000-0x000000000054D000-memory.dmp

Filesize
1.3MB

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads