vjw0rm | a1ee2ea563a62ce42f154749f225613c13b6c5568a0e4d955a2c09895ac1a26e

Analysis

max time kernel
110s
max time network
156s
platform
windows7_x64
resource
win7v20210410
submitted
28-07-2021 16:10

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General

Target

Invoice_#01.js
Size

9KB
MD5

758a8716e34bdc7cc046fcb9383216d9
SHA1

5faac5dd55211b967333205e71b9d934b14e88b5
SHA256

a1ee2ea563a62ce42f154749f225613c13b6c5568a0e4d955a2c09895ac1a26e
SHA512

1fba12f0bc766bcd8ebc3203dd2ef833f0f34f4fd53f435d9f224e97ba450886bb6ecf1aab92cc912a7eaa3e31e100f650a386051438449fcc01f01afa9acbb7

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 1128 wscript.exe

flow	pid	process
5	1128	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\Invoice_#01.js	wscript.exe
File opened for modification	C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\Invoice_#01.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-1-5-21-2513283230-931923277-594887482-1000\Software\Microsoft\Windows\CurrentVersion\Run	wscript.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-2513283230-931923277-594887482-1000\Software\Microsoft\Windows\CurrentVersion\Run\MX1CAYIRN3 = "\"C:\\Users\\Admin\\AppData\\Local\\Temp\\Invoice_#01.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

1352 schtasks.exe

pid	process
1352	schtasks.exe

Suspicious use of WriteProcessMemory 3 IoCs

Processes:

wscript.exe

description	pid	process	target process
PID 1128 wrote to memory of 1352	1128	wscript.exe	schtasks.exe
PID 1128 wrote to memory of 1352	1128	wscript.exe	schtasks.exe
PID 1128 wrote to memory of 1352	1128	wscript.exe	schtasks.exe

C:\Windows\system32\wscript.exe
wscript.exe C:\Users\Admin\AppData\Local\Temp\Invoice_#01.js
1⤵
- Blocklisted process makes network request
- Drops startup file
- Adds Run key to start application
- Suspicious use of WriteProcessMemory
PID:1128
- C:\Windows\System32\schtasks.exe
  "C:\Windows\System32\schtasks.exe" /create /sc minute /mo 30 /tn Skype /tr "C:\Users\Admin\AppData\Local\Temp\Invoice_#01.js
  2⤵
  - Creates scheduled task(s)
  PID:1352

Network

MITRE ATT&CK Enterprise 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

Command and Control

Exfiltration

Impact

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Downloads

memory/1352-59-0x0000000000000000-mapping.dmp

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