vjw0rm | 2141c93c89f63436f7408c446303f12a1cb9607b7d6d32f1a80e2bdc2d02defd

General

Target

AWB#00756543.pdf.js
Size

3.6MB
MD5

7bfa30c168b4a5dda79908ba88afb1f4
SHA1

5baf4ac9e0803e69add06a558dc2e5de9d2b9cb5
SHA256

2141c93c89f63436f7408c446303f12a1cb9607b7d6d32f1a80e2bdc2d02defd
SHA512

0af7774c5a4d06cbe890fa94d3a7d7b1bf135372cd2bcc91e7018b4542c5eae86f82245189b7c9798f50d2604908e75b556fe2f18b692dc8585d4139f36630ca
SSDEEP

24576:3KbnF5Tsf5pjWDTxVMSTZ2g1oecJ6ZFRUS8jBZv8LlSiKSmCz+nOig2gy4dR6xqT:ixX

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 22 IoCs

flow	pid	Process
13	4128	wscript.exe
14	4916	wscript.exe
19	4128	wscript.exe
28	4128	wscript.exe
33	4916	wscript.exe
34	4128	wscript.exe
48	4128	wscript.exe
49	4128	wscript.exe
50	4128	wscript.exe
51	4916	wscript.exe
52	4128	wscript.exe
53	4128	wscript.exe
54	4128	wscript.exe
55	4916	wscript.exe
59	4128	wscript.exe
60	4128	wscript.exe
61	4128	wscript.exe
62	4916	wscript.exe
63	4128	wscript.exe
64	4128	wscript.exe
65	4128	wscript.exe
66	4916	wscript.exe

Checks computer location settings 2 TTPs 1 IoCs

Looks up country code configured in the registry, likely geofence.

Query Registry

T1012

System Information Discovery

T1082

description	ioc	Process
Key value queried	\REGISTRY\USER\S-1-5-21-1675742406-747946869-1029867430-1000\Control Panel\International\Geo\Nation	wscript.exe

Drops startup file 4 IoCs

description	ioc	Process
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
File created	C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\AWB#00756543.pdf.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\USER\S-1-5-21-1675742406-747946869-1029867430-1000\software\microsoft\windows\currentversion\run	wscript.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-1675742406-747946869-1029867430-1000\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\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

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 6 IoCs

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

description	flow	ioc
HTTP User-Agent header	51	WSHRAT\|D0F59775\|TPAVZECK\|Admin\|Microsoft Windows 10 Pro\|plus\|nan-av\|false - 28/3/2023\|JavaScript
HTTP User-Agent header	55	WSHRAT\|D0F59775\|TPAVZECK\|Admin\|Microsoft Windows 10 Pro\|plus\|nan-av\|false - 28/3/2023\|JavaScript
HTTP User-Agent header	62	WSHRAT\|D0F59775\|TPAVZECK\|Admin\|Microsoft Windows 10 Pro\|plus\|nan-av\|false - 28/3/2023\|JavaScript
HTTP User-Agent header	66	WSHRAT\|D0F59775\|TPAVZECK\|Admin\|Microsoft Windows 10 Pro\|plus\|nan-av\|false - 28/3/2023\|JavaScript
HTTP User-Agent header	14	WSHRAT\|D0F59775\|TPAVZECK\|Admin\|Microsoft Windows 10 Pro\|plus\|nan-av\|false - 28/3/2023\|JavaScript
HTTP User-Agent header	33	WSHRAT\|D0F59775\|TPAVZECK\|Admin\|Microsoft Windows 10 Pro\|plus\|nan-av\|false - 28/3/2023\|JavaScript

Suspicious use of WriteProcessMemory 2 IoCs

description	pid	Process	procid_target
PID 4916 wrote to memory of 4128	4916	wscript.exe	80
PID 4916 wrote to memory of 4128	4916	wscript.exe	80

C:\Windows\system32\wscript.exe
wscript.exe C:\Users\Admin\AppData\Local\Temp\AWB#00756543.pdf.js
1⤵
- Blocklisted process makes network request
- Checks computer location settings
- Drops startup file
- Adds Run key to start application
- Suspicious use of WriteProcessMemory
PID:4916
- 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:4128

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

Query Registry

1

T1012

System Information Discovery

2

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\AWB#00756543.pdf.js

Filesize
3.6MB

MD5
7bfa30c168b4a5dda79908ba88afb1f4

SHA1
5baf4ac9e0803e69add06a558dc2e5de9d2b9cb5

SHA256
2141c93c89f63436f7408c446303f12a1cb9607b7d6d32f1a80e2bdc2d02defd

SHA512
0af7774c5a4d06cbe890fa94d3a7d7b1bf135372cd2bcc91e7018b4542c5eae86f82245189b7c9798f50d2604908e75b556fe2f18b692dc8585d4139f36630ca

Download Submit
C:\Users\Admin\AppData\Roaming\yrZYEAjDyF.js

Filesize
346KB

MD5
4e08cafb44979a23ed156eb84253251f

SHA1
f5b099091b50cae50afc3c857aaa52c74a73ed8d

SHA256
f99e8a6ec4548cb1b24be2e2179926d113d17a1645f95f95211bcded86c3a9df

SHA512
24a4dc0f1526a21585b12a33caddce44b2f4bd0de55c2ae32ada292dab022cd2070eefd3955f6b4b2e70955caafdf6bba96add5a1d2b7d17189f9d32848a9235

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Analysis

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