asyncrat | fe0f056142303bda8538355d81aced08b4792c9787c6060ccad08442e0dacad0 | Triage

Analysis

max time kernel
148s
max time network
150s
platform
windows11-21h2_x64
resource
win11-20241007-en
resource tags

arch:x64arch:x86image:win11-20241007-enlocale:en-usos:windows11-21h2-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
behavioral5/files/0x001c00000002aae0-10.dat	family_asyncrat

Executes dropped EXE 1 IoCs

pid	Process
1056	winws.exe

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

Web Service

flow	ioc
8	pastebin.com
16	pastebin.com
17	pastebin.com
22	pastebin.com
27	pastebin.com
4	pastebin.com
15	pastebin.com
18	pastebin.com
14	pastebin.com
23	pastebin.com
7	pastebin.com
10	pastebin.com
12	pastebin.com
20	pastebin.com
31	pastebin.com
2	pastebin.com
9	pastebin.com
29	pastebin.com
5	pastebin.com
11	pastebin.com
24	pastebin.com
26	pastebin.com
28	pastebin.com
30	pastebin.com
1	pastebin.com
6	pastebin.com
13	pastebin.com
21	pastebin.com
25	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
756	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
400	schtasks.exe

Suspicious behavior: EnumeratesProcesses 19 IoCs

pid	Process
1864	winjs.exe
1864	winjs.exe
1864	winjs.exe
1864	winjs.exe
1864	winjs.exe
1864	winjs.exe
1864	winjs.exe
1864	winjs.exe
1864	winjs.exe
1864	winjs.exe
1864	winjs.exe
1864	winjs.exe
1864	winjs.exe
1864	winjs.exe
1864	winjs.exe
1864	winjs.exe
1864	winjs.exe
1864	winjs.exe
1864	winjs.exe

Suspicious use of AdjustPrivilegeToken 4 IoCs

description	pid	Process
Token: SeDebugPrivilege	1864	winjs.exe
Token: SeDebugPrivilege	1864	winjs.exe
Token: SeDebugPrivilege	1056	winws.exe
Token: SeDebugPrivilege	1056	winws.exe

Suspicious use of WriteProcessMemory 10 IoCs

description	pid	Process	procid_target
PID 1864 wrote to memory of 2884	1864	winjs.exe	78
PID 1864 wrote to memory of 2884	1864	winjs.exe	78
PID 1864 wrote to memory of 2936	1864	winjs.exe	80
PID 1864 wrote to memory of 2936	1864	winjs.exe	80
PID 2884 wrote to memory of 400	2884	cmd.exe	82
PID 2884 wrote to memory of 400	2884	cmd.exe	82
PID 2936 wrote to memory of 756	2936	cmd.exe	83
PID 2936 wrote to memory of 756	2936	cmd.exe	83
PID 2936 wrote to memory of 1056	2936	cmd.exe	84
PID 2936 wrote to memory of 1056	2936	cmd.exe	84

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⤵
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:1864
- 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:2884
- - 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:400
- C:\Windows\system32\cmd.exe
  C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\tmpBFD5.tmp.bat""
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:2936
- - C:\Windows\system32\timeout.exe
    timeout 3
    3⤵
    - Delays execution with timeout.exe
    PID:756
- - C:\Users\Admin\AppData\Roaming\winws.exe
    "C:\Users\Admin\AppData\Roaming\winws.exe"
    3⤵
    - Executes dropped EXE
    - Suspicious use of AdjustPrivilegeToken
    PID:1056

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\tmpBFD5.tmp.bat

Filesize
149B

MD5
43592447e1e5dc464ad65ffed2b79e4a

SHA1
a1533ce60e8beb6615185447b75990a21832d68e

SHA256
6cf7f95d331f368e48761e4123adeece0d4da7d011c0ff51243fcabcec738e7a

SHA512
94b6a82e56bfc5dd64ec3f08aaba65508872dfe90cf0a82799ce1f95519a5db767c38c4f7e47716aa0384a43e8e1d9cc72d1a552271c4cbcc2eb2862ceef047d

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

Filesize
52KB

MD5
623a97bc746f3b530b9f2cb2df7e9145

SHA1
1c03bf8e9db2120a1473c9c6924059e75639fa1c

SHA256
fe0f056142303bda8538355d81aced08b4792c9787c6060ccad08442e0dacad0

SHA512
c0b89b096704a2727bf0242b2d20ed563980e51c4535cac98a9a34d84e89289bda87e3763bedb615f04f72d18a502f48b8ad5276c9e8dc4d1373e1a0bd47ff52

Download Submit
memory/1864-0-0x00007FFC667A3000-0x00007FFC667A5000-memory.dmp

Filesize
8KB

Download
memory/1864-1-0x0000000000750000-0x0000000000764000-memory.dmp

Filesize
80KB

Download
memory/1864-2-0x00007FFC667A0000-0x00007FFC67262000-memory.dmp

Filesize
10.8MB

Download
memory/1864-7-0x00007FFC667A0000-0x00007FFC67262000-memory.dmp

Filesize
10.8MB

Download