asyncrat | cee54813009042b01b4ebd1afbf99160b0c25465b7530332ba5bb064be6eba63

General

Target

REQUEST FOR MV W-MAYFAIR.js
Size

128KB
MD5

3a084e6817bf9b361b8ff6618d767c09
SHA1

f27662987fd14d69523efec560e29c1d66a2a645
SHA256

cee54813009042b01b4ebd1afbf99160b0c25465b7530332ba5bb064be6eba63
SHA512

a49b1732ea52aff5cdf57b10ef8c46c5185805ed13a6d032b5cc0aa326a4101aa6744ac12732ed5f8c87e9ad39d8b7da8b31a4c2208eb79c97db6c9e94b0fd11
SSDEEP

3072:ool0yHnHmo2BPDf/DUGOxxVZh/O5kaUH02x2RVy:ogHmouPDf/DnYhmhPRVy

Score

10^/10

asyncrat vjw0rm default rat spyware stealer trojan worm

Malware Config

Extracted

Family

asyncrat

Version

0.5.7B

Botnet

Default

C2

84.21.172.33:6606

84.21.172.33:7707

84.21.172.33:8808

Mutex

AsyncMutex_6SI8OkPnk

Attributes

delay
3
install
true
install_file
Recycle Bin.exe
install_folder
%AppData%

aes.plain

Signatures

AsyncRat
AsyncRAT is designed to remotely monitor and control other computers.
rat asyncrat
Vjw0rm
Vjw0rm is a remote access trojan written in JavaScript.
trojan worm vjw0rm

Async RAT payload 5 IoCs

rat

resource	yara_rule
behavioral2/files/0x0007000000022e39-135.dat	asyncrat
behavioral2/files/0x0007000000022e39-136.dat	asyncrat
behavioral2/memory/4996-137-0x0000000000240000-0x0000000000252000-memory.dmp	asyncrat
behavioral2/files/0x0006000000022e40-145.dat	asyncrat
behavioral2/files/0x0006000000022e40-146.dat	asyncrat

Blocklisted process makes network request 10 IoCs

flow	pid	Process
5	4940	wscript.exe
14	4940	wscript.exe
21	4940	wscript.exe
25	4940	wscript.exe
35	4940	wscript.exe
36	4940	wscript.exe
47	4940	wscript.exe
50	4940	wscript.exe
52	4940	wscript.exe
53	4940	wscript.exe

Executes dropped EXE 2 IoCs

pid	Process
4996	AsyncClient.exe
5052	Recycle Bin.exe

Checks computer location settings 2 TTPs 2 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-1-5-21-2386679933-1492765628-3466841596-1000\Control Panel\International\Geo\Nation	wscript.exe
Key value queried	\REGISTRY\USER\S-1-5-21-2386679933-1492765628-3466841596-1000\Control Panel\International\Geo\Nation	AsyncClient.exe

Drops startup file 2 IoCs

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

Reads user/profile data of web browsers 2 TTPs
Infostealers often target stored browser data, which can include saved credentials etc.
spyware stealer

Data from Local System
T1005

Credentials in Files
T1081
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

pid	Process
1472	schtasks.exe

Delays execution with timeout.exe 1 IoCs

evasion

pid	Process
1792	timeout.exe

Suspicious behavior: EnumeratesProcesses 23 IoCs

pid	Process
4996	AsyncClient.exe
4996	AsyncClient.exe
4996	AsyncClient.exe
4996	AsyncClient.exe
4996	AsyncClient.exe
4996	AsyncClient.exe
4996	AsyncClient.exe
4996	AsyncClient.exe
4996	AsyncClient.exe
4996	AsyncClient.exe
4996	AsyncClient.exe
4996	AsyncClient.exe
4996	AsyncClient.exe
4996	AsyncClient.exe
4996	AsyncClient.exe
4996	AsyncClient.exe
4996	AsyncClient.exe
4996	AsyncClient.exe
4996	AsyncClient.exe
4996	AsyncClient.exe
4996	AsyncClient.exe
4996	AsyncClient.exe
4996	AsyncClient.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	4996	AsyncClient.exe
Token: SeDebugPrivilege	5052	Recycle Bin.exe

Suspicious use of WriteProcessMemory 20 IoCs

description	pid	Process	procid_target
PID 372 wrote to memory of 4940	372	wscript.exe	81
PID 372 wrote to memory of 4940	372	wscript.exe	81
PID 372 wrote to memory of 4996	372	wscript.exe	82
PID 372 wrote to memory of 4996	372	wscript.exe	82
PID 372 wrote to memory of 4996	372	wscript.exe	82
PID 4996 wrote to memory of 1076	4996	AsyncClient.exe	86
PID 4996 wrote to memory of 1076	4996	AsyncClient.exe	86
PID 4996 wrote to memory of 1076	4996	AsyncClient.exe	86
PID 4996 wrote to memory of 2844	4996	AsyncClient.exe	88
PID 4996 wrote to memory of 2844	4996	AsyncClient.exe	88
PID 4996 wrote to memory of 2844	4996	AsyncClient.exe	88
PID 1076 wrote to memory of 1472	1076	cmd.exe	90
PID 1076 wrote to memory of 1472	1076	cmd.exe	90
PID 1076 wrote to memory of 1472	1076	cmd.exe	90
PID 2844 wrote to memory of 1792	2844	cmd.exe	91
PID 2844 wrote to memory of 1792	2844	cmd.exe	91
PID 2844 wrote to memory of 1792	2844	cmd.exe	91
PID 2844 wrote to memory of 5052	2844	cmd.exe	93
PID 2844 wrote to memory of 5052	2844	cmd.exe	93
PID 2844 wrote to memory of 5052	2844	cmd.exe	93

C:\Windows\system32\wscript.exe
wscript.exe "C:\Users\Admin\AppData\Local\Temp\REQUEST FOR MV W-MAYFAIR.js"
1⤵
- Checks computer location settings
- Suspicious use of WriteProcessMemory
PID:372
- C:\Windows\System32\wscript.exe
  "C:\Windows\System32\wscript.exe" //B "C:\Users\Admin\AppData\Roaming\FtFYVjAgTz.js"
  2⤵
  - Blocklisted process makes network request
  - Drops startup file
  PID:4940
- C:\Users\Admin\AppData\Local\Temp\AsyncClient.exe
  "C:\Users\Admin\AppData\Local\Temp\AsyncClient.exe"
  2⤵
  - Executes dropped EXE
  - Checks computer location settings
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of WriteProcessMemory
  PID:4996
- - C:\Windows\SysWOW64\cmd.exe
    "C:\Windows\System32\cmd.exe" /c schtasks /create /f /sc onlogon /rl highest /tn "Recycle Bin" /tr '"C:\Users\Admin\AppData\Roaming\Recycle Bin.exe"' & exit
    3⤵
    - Suspicious use of WriteProcessMemory
    PID:1076
  - - C:\Windows\SysWOW64\schtasks.exe
      schtasks /create /f /sc onlogon /rl highest /tn "Recycle Bin" /tr '"C:\Users\Admin\AppData\Roaming\Recycle Bin.exe"'
      4⤵
      Creates scheduled task(s)
      PID:1472
- - C:\Windows\SysWOW64\cmd.exe
    C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\tmp7FD3.tmp.bat""
    3⤵
    - Suspicious use of WriteProcessMemory
    PID:2844
  - - C:\Windows\SysWOW64\timeout.exe
      timeout 3
      4⤵
      Delays execution with timeout.exe
      PID:1792
  - - C:\Users\Admin\AppData\Roaming\Recycle Bin.exe
      "C:\Users\Admin\AppData\Roaming\Recycle Bin.exe"
      4⤵
      Executes dropped EXE
      Suspicious use of AdjustPrivilegeToken
      PID:5052

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Scheduled Task

1

T1053

Persistence

Scheduled Task

1

T1053

Privilege Escalation

Scheduled Task

1

T1053

Defense Evasion

Credential Access

Credentials in Files

1

T1081

Discovery

Query Registry

1

T1012

System Information Discovery

2

T1082

Lateral Movement

Collection

Data from Local System

1

T1005

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

C:\Users\Admin\AppData\Local\Temp\AsyncClient.exe

Filesize
48KB

MD5
1b5be7647628e1de782bb8f33d369dd3

SHA1
cd6e2f240ea97d03c6c796ab3573f728d6c30d9f

SHA256
fb7bd4fd5348db2f3b763f5215e964892387af9fe83df18455432dc245f7b903

SHA512
93de4f650672705d3975ba7dd0d0901c03834117d014f91dc093ac0a26abed7737aa2344dd30bb8fd258220576d09ec15368777597d78bec9f43dfa53f67b155

Download Submit
C:\Users\Admin\AppData\Local\Temp\AsyncClient.exe

Filesize
48KB

MD5
1b5be7647628e1de782bb8f33d369dd3

SHA1
cd6e2f240ea97d03c6c796ab3573f728d6c30d9f

SHA256
fb7bd4fd5348db2f3b763f5215e964892387af9fe83df18455432dc245f7b903

SHA512
93de4f650672705d3975ba7dd0d0901c03834117d014f91dc093ac0a26abed7737aa2344dd30bb8fd258220576d09ec15368777597d78bec9f43dfa53f67b155

Download Submit
C:\Users\Admin\AppData\Local\Temp\tmp7FD3.tmp.bat

Filesize
155B

MD5
7992de01af08d08ca180f7698efd9d6f

SHA1
110093addb8489a40d547912e58d65d62e126d7d

SHA256
0d05720a0966d99bdc852f86268a8e88a9b1bcd3a65a1f0ca3eb2f1baad3b6bc

SHA512
2130256f80836409e1048c1c56a940bca5443eb039d555aea3c779716974fc4e3b83ffd3d53fe79e667198cb5fa41487a0c28f587fdc944c2b21c942a8997eba

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

Filesize
16KB

MD5
7586d9e4467d26fde97538eab36cf88c

SHA1
d7fcd37e0bc9e790023a38d2d470cd001f81ca92

SHA256
7aff4cbd997ad6886484076ba71d1c067931d9a1462aa16e9d2fc47b4d5b8f18

SHA512
02676bd1e1086eeae9bdec3bce065ac97267c457daf6fbd77a783d7fc81fc6f891518d6fd19dd525e84ebd25e3098614c4bbefa71ded301cd3a7a46ed2a40e0a

Download Submit
C:\Users\Admin\AppData\Roaming\Recycle Bin.exe

Filesize
48KB

MD5
1b5be7647628e1de782bb8f33d369dd3

SHA1
cd6e2f240ea97d03c6c796ab3573f728d6c30d9f

SHA256
fb7bd4fd5348db2f3b763f5215e964892387af9fe83df18455432dc245f7b903

SHA512
93de4f650672705d3975ba7dd0d0901c03834117d014f91dc093ac0a26abed7737aa2344dd30bb8fd258220576d09ec15368777597d78bec9f43dfa53f67b155

Download Submit
C:\Users\Admin\AppData\Roaming\Recycle Bin.exe

Filesize
48KB

MD5
1b5be7647628e1de782bb8f33d369dd3

SHA1
cd6e2f240ea97d03c6c796ab3573f728d6c30d9f

SHA256
fb7bd4fd5348db2f3b763f5215e964892387af9fe83df18455432dc245f7b903

SHA512
93de4f650672705d3975ba7dd0d0901c03834117d014f91dc093ac0a26abed7737aa2344dd30bb8fd258220576d09ec15368777597d78bec9f43dfa53f67b155

Download Submit
memory/4996-138-0x0000000004D10000-0x0000000004DAC000-memory.dmp

Filesize
624KB

Download
memory/4996-137-0x0000000000240000-0x0000000000252000-memory.dmp

Filesize
72KB

Download
memory/5052-147-0x0000000005B30000-0x00000000060D4000-memory.dmp

Filesize
5.6MB

Download
memory/5052-148-0x00000000055F0000-0x0000000005656000-memory.dmp

Filesize
408KB

Download
memory/5052-149-0x0000000006960000-0x00000000069D6000-memory.dmp

Filesize
472KB

Download
memory/5052-150-0x0000000006A00000-0x0000000006A1E000-memory.dmp

Filesize
120KB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v6

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Downloads