asyncrat | fe0f056142303bda8538355d81aced08b4792c9787c6060ccad08442e0dacad0 | Triage

Analysis

max time kernel
149s
max time network
150s
platform
windows10-ltsc 2021_x64
resource
win10ltsc2021-20250128-en
resource tags

arch:x64arch:x86image:win10ltsc2021-20250128-enlocale:en-usos:windows10-ltsc 2021-x64system
submitted
30/01/2025, 12:49

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General

Target

winjs.exe
Size

52KB
MD5

623a97bc746f3b530b9f2cb2df7e9145
SHA1

1c03bf8e9db2120a1473c9c6924059e75639fa1c
SHA256

fe0f056142303bda8538355d81aced08b4792c9787c6060ccad08442e0dacad0
SHA512

c0b89b096704a2727bf0242b2d20ed563980e51c4535cac98a9a34d84e89289bda87e3763bedb615f04f72d18a502f48b8ad5276c9e8dc4d1373e1a0bd47ff52
SSDEEP

768:YoGDMmILyCe++bidiEuiso8Ybwge9V2COvEgK/Jn2i++++tyVc6KN:Yo0MWSMEzb3mOnkJLyVclN

Score

10^/10

asyncrat powershell rat

Malware Config

Extracted

Family

asyncrat

Version

1.0.7

Botnet

PowerShell

Mutex

DCSSZZVV

Attributes

delay
1
install
true
install_file
winws.exe
install_folder
%AppData%
pastebin_config
https://pastebin.com/raw/cn4rM5C9

aes.plain

Signatures

AsyncRat
AsyncRAT is designed to remotely monitor and control other computers written in C#.
rat asyncrat
Asyncrat family
asyncrat

Async RAT payload 1 IoCs

resource	yara_rule
behavioral4/files/0x000d000000027c8c-10.dat	family_asyncrat

Checks computer location settings 2 TTPs 1 IoCs

Looks up country code configured in the registry, likely geofence.

Query Registry

System Information Discovery

description	ioc	Process
Key value queried	\REGISTRY\USER\S-1-5-21-2839013668-2276131261-2828740280-1000\Control Panel\International\Geo\Nation	winjs.exe

Executes dropped EXE 1 IoCs

pid	Process
4288	winws.exe

Legitimate hosting services abused for malware hosting/C2 1 TTPs 29 IoCs

Web Service

flow	ioc
43	pastebin.com
50	pastebin.com
42	pastebin.com
48	pastebin.com
49	pastebin.com
6	pastebin.com
23	pastebin.com
24	pastebin.com
26	pastebin.com
30	pastebin.com
33	pastebin.com
5	pastebin.com
22	pastebin.com
44	pastebin.com
4	pastebin.com
21	pastebin.com
40	pastebin.com
41	pastebin.com
46	pastebin.com
1	pastebin.com
2	pastebin.com
27	pastebin.com
31	pastebin.com
47	pastebin.com
25	pastebin.com
28	pastebin.com
29	pastebin.com
45	pastebin.com
9	pastebin.com

Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).

System Information Discovery
T1082

Delays execution with timeout.exe 1 IoCs

defense_evasion

pid	Process
1104	timeout.exe

Scheduled Task/Job: Scheduled Task 1 TTPs 1 IoCs

Schtasks is often used by malware for persistence or to perform post-infection execution.

persistence execution

Scheduled Task

pid	Process
3840	schtasks.exe

Suspicious behavior: EnumeratesProcesses 21 IoCs

pid	Process
4960	winjs.exe
4960	winjs.exe
4960	winjs.exe
4960	winjs.exe
4960	winjs.exe
4960	winjs.exe
4960	winjs.exe
4960	winjs.exe
4960	winjs.exe
4960	winjs.exe
4960	winjs.exe
4960	winjs.exe
4960	winjs.exe
4960	winjs.exe
4960	winjs.exe
4960	winjs.exe
4960	winjs.exe
4960	winjs.exe
4960	winjs.exe
4960	winjs.exe
4960	winjs.exe

Suspicious use of AdjustPrivilegeToken 4 IoCs

description	pid	Process
Token: SeDebugPrivilege	4960	winjs.exe
Token: SeDebugPrivilege	4960	winjs.exe
Token: SeDebugPrivilege	4288	winws.exe
Token: SeDebugPrivilege	4288	winws.exe

Suspicious use of WriteProcessMemory 10 IoCs

description	pid	Process	procid_target
PID 4960 wrote to memory of 1932	4960	winjs.exe	83
PID 4960 wrote to memory of 1932	4960	winjs.exe	83
PID 4960 wrote to memory of 1592	4960	winjs.exe	85
PID 4960 wrote to memory of 1592	4960	winjs.exe	85
PID 1592 wrote to memory of 1104	1592	cmd.exe	87
PID 1592 wrote to memory of 1104	1592	cmd.exe	87
PID 1932 wrote to memory of 3840	1932	cmd.exe	88
PID 1932 wrote to memory of 3840	1932	cmd.exe	88
PID 1592 wrote to memory of 4288	1592	cmd.exe	89
PID 1592 wrote to memory of 4288	1592	cmd.exe	89

Uses Task Scheduler COM API 1 TTPs
The Task Scheduler COM API can be used to schedule applications to run on boot or at set times.
persistence

Query Registry
T1012

C:\Users\Admin\AppData\Local\Temp\winjs.exe
"C:\Users\Admin\AppData\Local\Temp\winjs.exe"
1⤵
- Checks computer location settings
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:4960
- C:\Windows\System32\cmd.exe
  "C:\Windows\System32\cmd.exe" /c schtasks /create /f /sc onlogon /rl highest /tn "winws" /tr '"C:\Users\Admin\AppData\Roaming\winws.exe"' & exit
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:1932
- - C:\Windows\system32\schtasks.exe
    schtasks /create /f /sc onlogon /rl highest /tn "winws" /tr '"C:\Users\Admin\AppData\Roaming\winws.exe"'
    3⤵
    - Scheduled Task/Job: Scheduled Task
    PID:3840
- C:\Windows\system32\cmd.exe
  C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\tmp7D0F.tmp.bat""
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:1592
- - C:\Windows\system32\timeout.exe
    timeout 3
    3⤵
    - Delays execution with timeout.exe
    PID:1104
- - C:\Users\Admin\AppData\Roaming\winws.exe
    "C:\Users\Admin\AppData\Roaming\winws.exe"
    3⤵
    - Executes dropped EXE
    - Suspicious use of AdjustPrivilegeToken
    PID:4288

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Scheduled Task/Job

Scheduled Task

Persistence

Scheduled Task/Job

Scheduled Task

Privilege Escalation

Scheduled Task/Job

Scheduled Task

Defense Evasion

Credential Access

Discovery

Query Registry

System Information Discovery

Lateral Movement

Collection

Command and Control

Web Service

Exfiltration

Impact

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Downloads

C:\Users\Admin\AppData\Local\Temp\tmp7D0F.tmp.bat

Filesize
149B

MD5
6595b5912fa8adc511ce2ee092b06189

SHA1
cb208587e02b1c8b95cda73740a3935a3d1a5f3e

SHA256
949b30ac7e11f6ddf963377ac68d39debd3ffb8fd672727670e7ce4cfe8a1618

SHA512
c590d74de676435a9d6a74cfcee6f85dccb9e1387c22023a5053b4d4687974a1f64acb2675c273fb1e386c4f9057a473ae555d83a3075e93b6969e9d2ec3abab

Download Submit
C:\Users\Admin\AppData\Roaming\winws.exe

Filesize
52KB

MD5
623a97bc746f3b530b9f2cb2df7e9145

SHA1
1c03bf8e9db2120a1473c9c6924059e75639fa1c

SHA256
fe0f056142303bda8538355d81aced08b4792c9787c6060ccad08442e0dacad0

SHA512
c0b89b096704a2727bf0242b2d20ed563980e51c4535cac98a9a34d84e89289bda87e3763bedb615f04f72d18a502f48b8ad5276c9e8dc4d1373e1a0bd47ff52

Download Submit
memory/4960-0-0x00007FF8C5A83000-0x00007FF8C5A85000-memory.dmp

Filesize
8KB

Download
memory/4960-1-0x0000000000C50000-0x0000000000C64000-memory.dmp

Filesize
80KB

Download
memory/4960-2-0x00007FF8C5A80000-0x00007FF8C6542000-memory.dmp

Filesize
10.8MB

Download
memory/4960-7-0x00007FF8C5A80000-0x00007FF8C6542000-memory.dmp

Filesize
10.8MB

Download