vobfus | 39586d1d2708b26ebcb188599b9564f8657b879f32c27c1a156288c0399fa83e

Analysis

max time kernel
164s
max time network
166s
platform
windows10-2004_x64
resource
win10v2004-20220310-en
submitted
15-03-2022 17:51

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General

Target

3958.exe
Size

220KB
MD5

2ace87034adcea65a2f266aaad73f734
SHA1

6b58441ecb9b5ed42a03f9e16399ffc0600a7352
SHA256

39586d1d2708b26ebcb188599b9564f8657b879f32c27c1a156288c0399fa83e
SHA512

2098e9c1d1fcbdf72023f3415416372f536f42911a0b3e82d8a2df15a26fff8b3dc9159c25713b973df02fc32e03f12212199d155e7107ba0f2758bae71191fc

Score

10^/10

vobfus persistence 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

T1060

Modify Registry

T1112

Processes:

3958.exe

description	ioc	process
Key created	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\Explorer\run	3958.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\Explorer\run\VLXHCMT5KJ = "C:\\Users\\Admin\\AppData\\Roaming\\AG58FPQON.exe"	3958.exe
Key created	\REGISTRY\USER\S-1-5-21-2403053463-4052593947-3703345493-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\policies\Explorer\run	3958.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-2403053463-4052593947-3703345493-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\Explorer\run\VLXHCMT5KJ = "C:\\Users\\Admin\\AppData\\Roaming\\AG58FPQON.exe"	3958.exe

Adds Run key to start application 2 TTPs 4 IoCs

persistence

Registry Run Keys / Startup Folder

T1060

Modify Registry

T1112

Processes:

3958.exe

description	ioc	process
Set value (str)	\REGISTRY\USER\S-1-5-21-2403053463-4052593947-3703345493-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\VLXHCMT5KJ = "C:\\Users\\Admin\\AppData\\Roaming\\AG58FPQON.exe"	3958.exe
Key created	\REGISTRY\MACHINE\Software\WOW6432Node\Microsoft\Windows\CurrentVersion\Run	3958.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows\CurrentVersion\Run\VLXHCMT5KJ = "C:\\Users\\Admin\\AppData\\Roaming\\AG58FPQON.exe"	3958.exe
Key created	\REGISTRY\USER\S-1-5-21-2403053463-4052593947-3703345493-1000\Software\Microsoft\Windows\CurrentVersion\Run	3958.exe

Script User-Agent 2 IoCs

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

Processes:

description	flow	ioc
HTTP User-Agent header	33	Mozilla/4.0 (compatible; Win32; WinHttp.WinHttpRequest.5)
HTTP User-Agent header	48	Mozilla/4.0 (compatible; Win32; WinHttp.WinHttpRequest.5)

Suspicious behavior: GetForegroundWindowSpam 1 IoCs

Processes:

3958.exe

pid process

3468 3958.exe
Suspicious behavior: RenamesItself 1 IoCs

Processes:

3958.exe

pid process

3468 3958.exe
Suspicious use of SetWindowsHookEx 2 IoCs

Processes:

3958.exe

pid process

3468 3958.exe
3468 3958.exe

pid	process
3468	3958.exe

pid	process
3468	3958.exe

pid	process
3468	3958.exe
3468	3958.exe

C:\Users\Admin\AppData\Local\Temp\3958.exe
"C:\Users\Admin\AppData\Local\Temp\3958.exe"
1⤵
- Adds policy Run key to start application
- Adds Run key to start application
- Suspicious behavior: GetForegroundWindowSpam
- Suspicious behavior: RenamesItself
- Suspicious use of SetWindowsHookEx
PID:3468

Network

MITRE ATT&CK Matrix ATT&CK v6

Initial Access

Execution

Persistence

Registry Run Keys / Startup Folder

T1060

Privilege Escalation

Defense Evasion

Modify Registry

T1112

Credential Access

Discovery

Lateral Movement

Collection

Exfiltration

Command and Control

Impact

Replay Monitor

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Downloads

memory/3468-134-0x0000000000400000-0x0000000000434000-memory.dmp

Filesize
208KB

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