vobfus | 6160bff7b553c0f2d4a3e243731c8ef50e73813b7e6d9c8f2c3d2e5ed192e3b0

General

Target

b9ba72364f223d78212e9d38b502923b_JaffaCakes118.exe
Size

147KB
MD5

b9ba72364f223d78212e9d38b502923b
SHA1

9d6c3128a6842aa900ebdfa63b7cc8009bf0b29b
SHA256

6160bff7b553c0f2d4a3e243731c8ef50e73813b7e6d9c8f2c3d2e5ed192e3b0
SHA512

292086223cd2ee1537083b146504d0902044d0b0ab58d85b083d03431b87e6168038a672455591dd3fbbdfa77ba7782e4b2bac8bd8e1b0dc02b5bf8a21012b8e
SSDEEP

3072:4HcMMv84jRd+cdCltQ9WRUyoUt4oMk6AdJ3Lr7mryWx:4Md+TKyt4oMk6ktLr7mrz

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\USER\S-1-5-21-945322488-2060912225-3527527000-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\policies\Explorer\run	b9ba72364f223d78212e9d38b502923b_JaffaCakes118.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-945322488-2060912225-3527527000-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\Explorer\run\IXV8HXBJRNO6S = "C:\\Users\\Admin\\AppData\\Roaming\\EDB5819S3B1.exe"	b9ba72364f223d78212e9d38b502923b_JaffaCakes118.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\Explorer\run	b9ba72364f223d78212e9d38b502923b_JaffaCakes118.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\Explorer\run\IXV8HXBJRNO6S = "C:\\Users\\Admin\\AppData\\Roaming\\EDB5819S3B1.exe"	b9ba72364f223d78212e9d38b502923b_JaffaCakes118.exe

UPX packed file 6 IoCs

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

upx

resource	yara_rule
behavioral2/memory/3448-2-0x0000000000400000-0x0000000000548000-memory.dmp	upx
behavioral2/memory/3448-3-0x0000000000400000-0x0000000000548000-memory.dmp	upx
behavioral2/memory/3448-5-0x0000000000400000-0x0000000000548000-memory.dmp	upx
behavioral2/memory/3448-10-0x0000000000400000-0x0000000000548000-memory.dmp	upx
behavioral2/memory/3448-13-0x0000000000400000-0x0000000000548000-memory.dmp	upx
behavioral2/memory/3448-39-0x0000000000400000-0x0000000000548000-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\IXV8HXBJRNO6S = "C:\\Users\\Admin\\AppData\\Roaming\\EDB5819S3B1.exe"	b9ba72364f223d78212e9d38b502923b_JaffaCakes118.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-945322488-2060912225-3527527000-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\IXV8HXBJRNO6S = "C:\\Users\\Admin\\AppData\\Roaming\\EDB5819S3B1.exe"	b9ba72364f223d78212e9d38b502923b_JaffaCakes118.exe

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 792 set thread context of 3448	792	b9ba72364f223d78212e9d38b502923b_JaffaCakes118.exe	92

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	b9ba72364f223d78212e9d38b502923b_JaffaCakes118.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	b9ba72364f223d78212e9d38b502923b_JaffaCakes118.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	regsvr32.exe

Script User-Agent 1 IoCs

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

description	flow	ioc
HTTP User-Agent header	30	Mozilla/4.0 (compatible; Win32; WinHttp.WinHttpRequest.5)

Suspicious behavior: RenamesItself 1 IoCs

pid	Process
3448	b9ba72364f223d78212e9d38b502923b_JaffaCakes118.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
3448	b9ba72364f223d78212e9d38b502923b_JaffaCakes118.exe

Suspicious use of WriteProcessMemory 11 IoCs

description	pid	Process	procid_target
PID 792 wrote to memory of 3448	792	b9ba72364f223d78212e9d38b502923b_JaffaCakes118.exe	92
PID 792 wrote to memory of 3448	792	b9ba72364f223d78212e9d38b502923b_JaffaCakes118.exe	92
PID 792 wrote to memory of 3448	792	b9ba72364f223d78212e9d38b502923b_JaffaCakes118.exe	92
PID 792 wrote to memory of 3448	792	b9ba72364f223d78212e9d38b502923b_JaffaCakes118.exe	92
PID 792 wrote to memory of 3448	792	b9ba72364f223d78212e9d38b502923b_JaffaCakes118.exe	92
PID 792 wrote to memory of 3448	792	b9ba72364f223d78212e9d38b502923b_JaffaCakes118.exe	92
PID 792 wrote to memory of 3448	792	b9ba72364f223d78212e9d38b502923b_JaffaCakes118.exe	92
PID 792 wrote to memory of 3448	792	b9ba72364f223d78212e9d38b502923b_JaffaCakes118.exe	92
PID 3448 wrote to memory of 2680	3448	b9ba72364f223d78212e9d38b502923b_JaffaCakes118.exe	96
PID 3448 wrote to memory of 2680	3448	b9ba72364f223d78212e9d38b502923b_JaffaCakes118.exe	96
PID 3448 wrote to memory of 2680	3448	b9ba72364f223d78212e9d38b502923b_JaffaCakes118.exe	96

C:\Users\Admin\AppData\Local\Temp\b9ba72364f223d78212e9d38b502923b_JaffaCakes118.exe
"C:\Users\Admin\AppData\Local\Temp\b9ba72364f223d78212e9d38b502923b_JaffaCakes118.exe"
1⤵
- Suspicious use of SetThreadContext
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:792
- C:\Users\Admin\AppData\Local\Temp\b9ba72364f223d78212e9d38b502923b_JaffaCakes118.exe
  "C:\Users\Admin\AppData\Local\Temp\b9ba72364f223d78212e9d38b502923b_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:3448
- - C:\Windows\SysWOW64\regsvr32.exe
    regsvr32.exe "C:\Users\Admin\AppData\Local\Temp\MSWINSCK.OCX" /s
    3⤵
    - System Location Discovery: System Language Discovery
    PID:2680

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\edb5819s3b1.exe.jpg

Filesize
147KB

MD5
b9ba72364f223d78212e9d38b502923b

SHA1
9d6c3128a6842aa900ebdfa63b7cc8009bf0b29b

SHA256
6160bff7b553c0f2d4a3e243731c8ef50e73813b7e6d9c8f2c3d2e5ed192e3b0

SHA512
292086223cd2ee1537083b146504d0902044d0b0ab58d85b083d03431b87e6168038a672455591dd3fbbdfa77ba7782e4b2bac8bd8e1b0dc02b5bf8a21012b8e

Download Submit
memory/3448-2-0x0000000000400000-0x0000000000548000-memory.dmp

Filesize
1.3MB

Download
memory/3448-3-0x0000000000400000-0x0000000000548000-memory.dmp

Filesize
1.3MB

Download
memory/3448-5-0x0000000000400000-0x0000000000548000-memory.dmp

Filesize
1.3MB

Download
memory/3448-10-0x0000000000400000-0x0000000000548000-memory.dmp

Filesize
1.3MB

Download
memory/3448-13-0x0000000000400000-0x0000000000548000-memory.dmp

Filesize
1.3MB

Download
memory/3448-39-0x0000000000400000-0x0000000000548000-memory.dmp

Filesize
1.3MB

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads