vjw0rm | 555b5c53b23a062843fdcafa1296709d36176b22249aef65f207460d4bdbf490

Analysis

max time kernel
140s
max time network
146s
platform
windows7_x64
resource
win7v20210408
submitted
22-07-2021 18:07

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General

Target

ER8NSOWUNA.js
Size

8KB
MD5

0d75df466a9ab3ec0decd6d186423903
SHA1

af6f88ff79b19b885650160eb11971d94ce81e10
SHA256

555b5c53b23a062843fdcafa1296709d36176b22249aef65f207460d4bdbf490
SHA512

e5d14ff15bdab8bc2c382ea97416e65983836fc86548c2a4f1fb6ee033e3fbd9a37f3de6cc7df631d23d607a8e6ad5c29e4a09e699a33488071152d6268994ad

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

5 1612 wscript.exe

flow	pid	process
5	1612	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\ER8NSOWUNA.js	wscript.exe
File opened for modification	C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\ER8NSOWUNA.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-1-5-21-2455352368-1077083310-2879168483-1000\Software\Microsoft\Windows\CurrentVersion\Run	wscript.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-2455352368-1077083310-2879168483-1000\Software\Microsoft\Windows\CurrentVersion\Run\MX1CAYIRN3 = "\"C:\\Users\\Admin\\AppData\\Local\\Temp\\ER8NSOWUNA.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

1692 schtasks.exe

pid	process
1692	schtasks.exe

Suspicious use of WriteProcessMemory 3 IoCs

Processes:

wscript.exe

description	pid	process	target process
PID 1612 wrote to memory of 1692	1612	wscript.exe	schtasks.exe
PID 1612 wrote to memory of 1692	1612	wscript.exe	schtasks.exe
PID 1612 wrote to memory of 1692	1612	wscript.exe	schtasks.exe

C:\Windows\system32\wscript.exe
wscript.exe C:\Users\Admin\AppData\Local\Temp\ER8NSOWUNA.js
1⤵
- Blocklisted process makes network request
- Drops startup file
- Adds Run key to start application
- Suspicious use of WriteProcessMemory
PID:1612

C:\Windows\System32\schtasks.exe
"C:\Windows\System32\schtasks.exe" /create /sc minute /mo 30 /tn Skype /tr "C:\Users\Admin\AppData\Local\Temp\ER8NSOWUNA.js
2⤵
- Creates scheduled task(s)
PID:1692

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/1692-59-0x0000000000000000-mapping.dmp

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