vjw0rm | 2141c93c89f63436f7408c446303f12a1cb9607b7d6d32f1a80e2bdc2d02defd

General

Target
AWB#00756543.pdf.js
Size 3.6MB
Sample230328-hvy35she52
SHA256 2141c93c89f63436f7408c446303f12a1cb9607b7d6d32f1a80e2bdc2d02defd
MD5 7bfa30c168b4a5dda79908ba88afb1f4
SHA1 5baf4ac9e0803e69add06a558dc2e5de9d2b9cb5
SHA512 0af7774c5a4d06cbe890fa94d3a7d7b1bf135372cd2bcc91e7018b4542c5eae86f82245189b7c9798f50d2604908e75b556fe2f18b692dc8585d4139f36630ca
SSDEEP 24576:3KbnF5Tsf5pjWDTxVMSTZ2g1oecJ6ZFRUS8jBZv8LlSiKSmCz+nOig2gy4dR6xqT:ixX
MD5 SHA1 SHA512 SSDEEP

Score

10^/10

vjw0rm wshrat persistence trojan worm

Malware Config

Extracted

Family

wshrat

C2

http://rookfellas.mrbasic.com:9202

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 20 IoCs

flow	pid	Process
7	1712	wscript.exe
8	324	wscript.exe
9	324	wscript.exe
12	324	wscript.exe
15	324	wscript.exe
17	1712	wscript.exe
18	324	wscript.exe
21	324	wscript.exe
24	324	wscript.exe
25	1712	wscript.exe
26	324	wscript.exe
29	324	wscript.exe
32	324	wscript.exe
34	1712	wscript.exe
35	324	wscript.exe
38	324	wscript.exe
40	324	wscript.exe
42	1712	wscript.exe
43	324	wscript.exe
45	324	wscript.exe

Drops startup file 4 IoCs

description	ioc	Process
File created	C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\AWB#00756543.pdf.js	wscript.exe
File opened for modification	C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\AWB#00756543.pdf.js	wscript.exe
File created	C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\yrZYEAjDyF.js	wscript.exe
File opened for modification	C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\yrZYEAjDyF.js	wscript.exe

Adds Run key to start application 2 TTPs 4 IoCs

persistence

Registry Run Keys / Startup Folder

T1060

Modify Registry

T1112

description	ioc	Process
Key created	\REGISTRY\MACHINE\software\microsoft\windows\currentversion\run	wscript.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\AWB#00756543 = "wscript.exe //B \"C:\\Users\\Admin\\AppData\\Local\\Temp\\AWB#00756543.pdf.js\""	wscript.exe
Key created	\REGISTRY\USER\S-1-5-21-1914912747-3343861975-731272777-1000\software\microsoft\windows\currentversion\run	wscript.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-1914912747-3343861975-731272777-1000\Software\Microsoft\Windows\CurrentVersion\Run\AWB#00756543 = "wscript.exe //B \"C:\\Users\\Admin\\AppData\\Local\\Temp\\AWB#00756543.pdf.js\""	wscript.exe

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

System Information Discovery
T1082

Script User-Agent 5 IoCs

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

description	flow	ioc
HTTP User-Agent header	7	WSHRAT\|706EFC06\|TMRJMUQF\|Admin\|Microsoft Windows 7 Ultimate \|plus\|nan-av\|false - 28/3/2023\|JavaScript
HTTP User-Agent header	17	WSHRAT\|706EFC06\|TMRJMUQF\|Admin\|Microsoft Windows 7 Ultimate \|plus\|nan-av\|false - 28/3/2023\|JavaScript
HTTP User-Agent header	25	WSHRAT\|706EFC06\|TMRJMUQF\|Admin\|Microsoft Windows 7 Ultimate \|plus\|nan-av\|false - 28/3/2023\|JavaScript
HTTP User-Agent header	34	WSHRAT\|706EFC06\|TMRJMUQF\|Admin\|Microsoft Windows 7 Ultimate \|plus\|nan-av\|false - 28/3/2023\|JavaScript
HTTP User-Agent header	42	WSHRAT\|706EFC06\|TMRJMUQF\|Admin\|Microsoft Windows 7 Ultimate \|plus\|nan-av\|false - 28/3/2023\|JavaScript

Suspicious use of WriteProcessMemory 3 IoCs

description	pid	Process	procid_target
PID 1712 wrote to memory of 324	1712	wscript.exe	27
PID 1712 wrote to memory of 324	1712	wscript.exe	27
PID 1712 wrote to memory of 324	1712	wscript.exe	27

C:\Windows\system32\wscript.exe
wscript.exe C:\Users\Admin\AppData\Local\Temp\AWB#00756543.pdf.js
1⤵
- Blocklisted process makes network request
- Drops startup file
- Adds Run key to start application
- Suspicious use of WriteProcessMemory
PID:1712
- C:\Windows\System32\wscript.exe
  "C:\Windows\System32\wscript.exe" //B "C:\Users\Admin\AppData\Roaming\yrZYEAjDyF.js"
  2⤵
  - Blocklisted process makes network request
  - Drops startup file
  PID:324

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

Replay Monitor

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Downloads

AWB#00756543.pdf.js

Path C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\AWB#00756543.pdf.js
Size 3.6MB
SHA256 2141c93c89f63436f7408c446303f12a1cb9607b7d6d32f1a80e2bdc2d02defd
MD5 7bfa30c168b4a5dda79908ba88afb1f4
SHA1 5baf4ac9e0803e69add06a558dc2e5de9d2b9cb5
SHA512 0af7774c5a4d06cbe890fa94d3a7d7b1bf135372cd2bcc91e7018b4542c5eae86f82245189b7c9798f50d2604908e75b556fe2f18b692dc8585d4139f36630ca
SSDEEP 24576:3KbnF5Tsf5pjWDTxVMSTZ2g1oecJ6ZFRUS8jBZv8LlSiKSmCz+nOig2gy4dR6xqT:ixX
MD5 SHA1 SHA512 SSDEEP

Submit Download

yrZYEAjDyF.js

Path C:\Users\Admin\AppData\Roaming\yrZYEAjDyF.js
Size 346KB
SHA256 f99e8a6ec4548cb1b24be2e2179926d113d17a1645f95f95211bcded86c3a9df
MD5 4e08cafb44979a23ed156eb84253251f
SHA1 f5b099091b50cae50afc3c857aaa52c74a73ed8d
SHA512 24a4dc0f1526a21585b12a33caddce44b2f4bd0de55c2ae32ada292dab022cd2070eefd3955f6b4b2e70955caafdf6bba96add5a1d2b7d17189f9d32848a9235
SSDEEP 6144:eQfPBx5q0sQ1o7rsbHC01mDBpNW2mTMSbpuV8rY:eQ3B7qgp2
MD5 SHA1 SHA512 SSDEEP