vobfus | a6ef6f6c2903431580bdd87e3aa3ee4fdd1f33b3a533a72ff735185e3d32ad9c

General

Target

87d9ef97da1e685c852a13caa06d07fb_JaffaCakes118.exe
Size

95KB
MD5

87d9ef97da1e685c852a13caa06d07fb
SHA1

96721e8bc666588b9f2b1adc01f13d566157a989
SHA256

a6ef6f6c2903431580bdd87e3aa3ee4fdd1f33b3a533a72ff735185e3d32ad9c
SHA512

ab10ed5236fa6ded2d1d595c8fbca9a552aa05bb289ecd0d87149a7f852bff438d5fe8a6007230e6b4002c5e1839c91e44f9406e60fa7337eecf9dc1cc7212ad
SSDEEP

1536:fN8k3qSADi1D5z8HqyA8vk0mRW2abvrRt5Cmxvxi2XB8fgHR29Z15zFvUprX:d1ADKD5ADMrRALk6xiVfgxWZPzFST

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
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\Explorer\run\HHV4XZUVYHVMP = "C:\\Users\\Admin\\AppData\\Roaming\\DYC1P3T3A.exe"	87d9ef97da1e685c852a13caa06d07fb_JaffaCakes118.exe
Key created	\REGISTRY\USER\S-1-5-21-3350944739-639801879-157714471-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\policies\Explorer\run	87d9ef97da1e685c852a13caa06d07fb_JaffaCakes118.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-3350944739-639801879-157714471-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\Explorer\run\HHV4XZUVYHVMP = "C:\\Users\\Admin\\AppData\\Roaming\\DYC1P3T3A.exe"	87d9ef97da1e685c852a13caa06d07fb_JaffaCakes118.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\Explorer\run	87d9ef97da1e685c852a13caa06d07fb_JaffaCakes118.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\HHV4XZUVYHVMP = "C:\\Users\\Admin\\AppData\\Roaming\\DYC1P3T3A.exe"	87d9ef97da1e685c852a13caa06d07fb_JaffaCakes118.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-3350944739-639801879-157714471-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\HHV4XZUVYHVMP = "C:\\Users\\Admin\\AppData\\Roaming\\DYC1P3T3A.exe"	87d9ef97da1e685c852a13caa06d07fb_JaffaCakes118.exe

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 724 set thread context of 2132	724	87d9ef97da1e685c852a13caa06d07fb_JaffaCakes118.exe	87

UPX packed file 7 IoCs

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

upx

resource	yara_rule
behavioral2/memory/2132-1-0x0000000000400000-0x0000000000431000-memory.dmp	upx
behavioral2/memory/2132-4-0x0000000000400000-0x0000000000431000-memory.dmp	upx
behavioral2/memory/2132-6-0x0000000000400000-0x0000000000431000-memory.dmp	upx
behavioral2/memory/2132-11-0x0000000000400000-0x0000000000431000-memory.dmp	upx
behavioral2/memory/2132-12-0x0000000000400000-0x0000000000431000-memory.dmp	upx
behavioral2/memory/2132-25-0x0000000000400000-0x0000000000431000-memory.dmp	upx
behavioral2/memory/2132-68-0x0000000000400000-0x0000000000431000-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	87d9ef97da1e685c852a13caa06d07fb_JaffaCakes118.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	87d9ef97da1e685c852a13caa06d07fb_JaffaCakes118.exe

Script User-Agent 4 IoCs

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

description	flow	ioc
HTTP User-Agent header	20	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	72	Mozilla/4.0 (compatible; Win32; WinHttp.WinHttpRequest.5)
HTTP User-Agent header	73	Mozilla/4.0 (compatible; Win32; WinHttp.WinHttpRequest.5)

Suspicious behavior: GetForegroundWindowSpam 1 IoCs

pid	Process
2132	87d9ef97da1e685c852a13caa06d07fb_JaffaCakes118.exe

Suspicious behavior: RenamesItself 1 IoCs

pid	Process
2132	87d9ef97da1e685c852a13caa06d07fb_JaffaCakes118.exe

Suspicious use of SetWindowsHookEx 2 IoCs

pid	Process
2132	87d9ef97da1e685c852a13caa06d07fb_JaffaCakes118.exe
2132	87d9ef97da1e685c852a13caa06d07fb_JaffaCakes118.exe

Suspicious use of WriteProcessMemory 7 IoCs

description	pid	Process	procid_target
PID 724 wrote to memory of 2132	724	87d9ef97da1e685c852a13caa06d07fb_JaffaCakes118.exe	87
PID 724 wrote to memory of 2132	724	87d9ef97da1e685c852a13caa06d07fb_JaffaCakes118.exe	87
PID 724 wrote to memory of 2132	724	87d9ef97da1e685c852a13caa06d07fb_JaffaCakes118.exe	87
PID 724 wrote to memory of 2132	724	87d9ef97da1e685c852a13caa06d07fb_JaffaCakes118.exe	87
PID 724 wrote to memory of 2132	724	87d9ef97da1e685c852a13caa06d07fb_JaffaCakes118.exe	87
PID 724 wrote to memory of 2132	724	87d9ef97da1e685c852a13caa06d07fb_JaffaCakes118.exe	87
PID 724 wrote to memory of 2132	724	87d9ef97da1e685c852a13caa06d07fb_JaffaCakes118.exe	87

C:\Users\Admin\AppData\Local\Temp\87d9ef97da1e685c852a13caa06d07fb_JaffaCakes118.exe
"C:\Users\Admin\AppData\Local\Temp\87d9ef97da1e685c852a13caa06d07fb_JaffaCakes118.exe"
1⤵
- Suspicious use of SetThreadContext
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:724
- C:\Users\Admin\AppData\Local\Temp\87d9ef97da1e685c852a13caa06d07fb_JaffaCakes118.exe
  C:\Users\Admin\AppData\Local\Temp\87d9ef97da1e685c852a13caa06d07fb_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:2132

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\dyc1p3t3a.exe.jpg

Filesize
95KB

MD5
87d9ef97da1e685c852a13caa06d07fb

SHA1
96721e8bc666588b9f2b1adc01f13d566157a989

SHA256
a6ef6f6c2903431580bdd87e3aa3ee4fdd1f33b3a533a72ff735185e3d32ad9c

SHA512
ab10ed5236fa6ded2d1d595c8fbca9a552aa05bb289ecd0d87149a7f852bff438d5fe8a6007230e6b4002c5e1839c91e44f9406e60fa7337eecf9dc1cc7212ad

Download Submit
memory/724-0-0x0000000000400000-0x000000000041C000-memory.dmp

Filesize
112KB

Download
memory/724-3-0x0000000000400000-0x000000000041C000-memory.dmp

Filesize
112KB

Download
memory/2132-1-0x0000000000400000-0x0000000000431000-memory.dmp

Filesize
196KB

Download
memory/2132-4-0x0000000000400000-0x0000000000431000-memory.dmp

Filesize
196KB

Download
memory/2132-6-0x0000000000400000-0x0000000000431000-memory.dmp

Filesize
196KB

Download
memory/2132-11-0x0000000000400000-0x0000000000431000-memory.dmp

Filesize
196KB

Download
memory/2132-12-0x0000000000400000-0x0000000000431000-memory.dmp

Filesize
196KB

Download
memory/2132-25-0x0000000000400000-0x0000000000431000-memory.dmp

Filesize
196KB

Download
memory/2132-68-0x0000000000400000-0x0000000000431000-memory.dmp

Filesize
196KB

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads