vjw0rm | 25b85c37e7a41e70b38eaedb06bc1eaafe8bbce4f9db25353c05716b1a77d8e6

Analysis

max time kernel
1181s
max time network
1204s
platform
windows7_x64
resource
win7-en-20210920
submitted
21-09-2021 18:26

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General

Target

TWR200719A.js
Size

9KB
MD5

3787cf61efad8ad8206ecf4646591523
SHA1

a4f5b2f8d95daf74ebb7fd69daa9db8d664d3d42
SHA256

d6c370036f27ac2a4b7a3c03dab8cba588d665197ba22391bb7ce8d049948d31
SHA512

d0f9885a76ced02d7d5b9b2a1ea4ee0cf9b9e3f178bf8495dae31c5adeb79818a00548eab73c4fe78b40468ad8bd75c13305e42b3aa8bf28c68356e3b4b9f27b

Score

10^/10

vjw0rm persistence trojan worm

Malware Config

Signatures

Vjw0rm
Vjw0rm is a remote access trojan written in JavaScript.
trojan worm vjw0rm
Blocklisted process makes network request 1 IoCs

Processes:

wscript.exe

flow pid process

3 768 wscript.exe

flow	pid	process
3	768	wscript.exe

Drops startup file 2 IoCs

Processes:

wscript.exe

description	ioc	process
File created	C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\TWR200719A.js	wscript.exe
File opened for modification	C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\TWR200719A.js	wscript.exe

Adds Run key to start application 2 TTPs 2 IoCs

persistence

Registry Run Keys / Startup Folder

T1060

Modify Registry

T1112

Processes:

wscript.exe

description	ioc	process
Key created	\REGISTRY\USER\S-1-5-21-3456797065-1076791440-4146276586-1000\Software\Microsoft\Windows\CurrentVersion\Run	wscript.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-3456797065-1076791440-4146276586-1000\Software\Microsoft\Windows\CurrentVersion\Run\JVEJAV8OP1 = "\"C:\\Users\\Admin\\AppData\\Local\\Temp\\TWR200719A.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
Creates scheduled task(s) 1 TTPs 1 IoCs
Schtasks is often used by malware for persistence or to perform post-infection execution.
persistence

Scheduled Task
T1053

Processes:

schtasks.exe

pid process

368 schtasks.exe

pid	process
368	schtasks.exe

Suspicious use of WriteProcessMemory 3 IoCs

Processes:

wscript.exe

description	pid	process	target process
PID 768 wrote to memory of 368	768	wscript.exe	schtasks.exe
PID 768 wrote to memory of 368	768	wscript.exe	schtasks.exe
PID 768 wrote to memory of 368	768	wscript.exe	schtasks.exe

C:\Windows\system32\wscript.exe
wscript.exe C:\Users\Admin\AppData\Local\Temp\TWR200719A.js
1⤵
- Blocklisted process makes network request
- Drops startup file
- Adds Run key to start application
- Suspicious use of WriteProcessMemory
PID:768

C:\Windows\System32\schtasks.exe
"C:\Windows\System32\schtasks.exe" /create /sc minute /mo 30 /tn Skype /tr "C:\Users\Admin\AppData\Local\Temp\TWR200719A.js
2⤵
- Creates scheduled task(s)
PID:368

Network

MITRE ATT&CK Matrix ATT&CK v6

Initial Access

Execution

Scheduled Task

T1053

Persistence

Registry Run Keys / Startup Folder

T1060

Scheduled Task

T1053

Privilege Escalation

Scheduled Task

T1053

Defense Evasion

Modify Registry

T1112

Credential Access

Discovery

System Information Discovery

T1082

Lateral Movement

Collection

Exfiltration

Command and Control

Impact

Replay Monitor

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Downloads

memory/368-53-0x0000000000000000-mapping.dmp

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