vjw0rm | 53838e5cc5aed0da2d6f91ab858a442e3e1760aef0cc333ba69e9610993e9ce3

Analysis

max time kernel
119s
max time network
119s
platform
windows7_x64
resource
win7-en-20210920
submitted
07-10-2021 16:35

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General

Target

I1B26A8C6D5Z.js
Size

81KB
MD5

fd18077eddfff5bb1d86e8f0de281d6d
SHA1

1a415d1c8263b8de8eb9352f4855dead687ce7fa
SHA256

53838e5cc5aed0da2d6f91ab858a442e3e1760aef0cc333ba69e9610993e9ce3
SHA512

f63f848bcf69be3f71d28ac98bb09e8f6186076d08e216423cedbe3a7cd75b0f1c7bdeb67bf77532730acf9cd3db9bf97d07c57948a4d655eeee802d80c531ec

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 1424 wscript.exe

flow	pid	process
5	1424	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\I1B26A8C6D5Z.js	wscript.exe
File opened for modification	C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\I1B26A8C6D5Z.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\4YC5ICXZVV = "'C:\\Users\\Admin\\AppData\\Local\\Temp\\I1B26A8C6D5Z.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

576 schtasks.exe

pid	process
576	schtasks.exe

Suspicious use of WriteProcessMemory 3 IoCs

Processes:

wscript.exe

description	pid	process	target process
PID 1424 wrote to memory of 576	1424	wscript.exe	schtasks.exe
PID 1424 wrote to memory of 576	1424	wscript.exe	schtasks.exe
PID 1424 wrote to memory of 576	1424	wscript.exe	schtasks.exe

C:\Windows\system32\wscript.exe
wscript.exe C:\Users\Admin\AppData\Local\Temp\I1B26A8C6D5Z.js
1⤵
- Blocklisted process makes network request
- Drops startup file
- Adds Run key to start application
- Suspicious use of WriteProcessMemory
PID:1424

C:\Windows\System32\schtasks.exe
"C:\Windows\System32\schtasks.exe" /create /sc minute /mo 30 /tn Skype /tr 'C:\Users\Admin\AppData\Local\Temp\I1B26A8C6D5Z.js
2⤵
- Creates scheduled task(s)
PID:576

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/576-54-0x0000000000000000-mapping.dmp

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memory/1424-53-0x000007FEFBB51000-0x000007FEFBB53000-memory.dmp

Filesize
8KB

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