asyncrat | 8ef32b44cf21b690415e603eb6889c8c2e9294e76028b9dbd4c20a23077167f8

General

Target

Client.exe
Size

47KB
MD5

8a0bb8ae35abf7a92325e632a5a3adc0
SHA1

0042da0ec0b6f9c32a06becc845e0591870e410c
SHA256

8ef32b44cf21b690415e603eb6889c8c2e9294e76028b9dbd4c20a23077167f8
SHA512

ef89ad0def338bfab7e8fe435b1c964e62c56d0589721dda750e72b861492c6bccef7be95190b9df974e3bbfeda3e3f421eedb3d673cd45a7f3c5ce52b4a2fd4
SSDEEP

768:boq0GnILSC+e+biNtelDSN+iV08YbygeXFa3ZzvEgK/JDZVc6KN:cqTyNtKDs4zb18eZznkJDZVclN

Score

10^/10

asyncrat default rat

Malware Config

Extracted

Family

asyncrat

Version

1.0.7

Botnet

Default

C2

tax-sri.gl.at.ply.gg:5353

tax-sri.gl.at.ply.gg:9388

Mutex

DcRatMutex_qwqdanchun

Attributes

delay
1
install
true
install_file
..exe
install_folder
%AppData%

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

rat

resource	yara_rule
behavioral2/files/0x000800000001e58a-10.dat	family_asyncrat

Checks computer location settings 2 TTPs 1 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-1-5-21-940901362-3608833189-1915618603-1000\Control Panel\International\Geo\Nation	Client.exe

Executes dropped EXE 1 IoCs

pid	Process
3972	..exe

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

evasion

pid	Process
4224	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

T1053.005

pid	Process
3448	schtasks.exe

Suspicious behavior: EnumeratesProcesses 23 IoCs

pid	Process
3988	Client.exe
3988	Client.exe
3988	Client.exe
3988	Client.exe
3988	Client.exe
3988	Client.exe
3988	Client.exe
3988	Client.exe
3988	Client.exe
3988	Client.exe
3988	Client.exe
3988	Client.exe
3988	Client.exe
3988	Client.exe
3988	Client.exe
3988	Client.exe
3988	Client.exe
3988	Client.exe
3988	Client.exe
3988	Client.exe
3988	Client.exe
3988	Client.exe
3988	Client.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	3988	Client.exe
Token: SeDebugPrivilege	3972	..exe

Suspicious use of WriteProcessMemory 10 IoCs

description	pid	Process	procid_target
PID 3988 wrote to memory of 4744	3988	Client.exe	88
PID 3988 wrote to memory of 4744	3988	Client.exe	88
PID 3988 wrote to memory of 2836	3988	Client.exe	90
PID 3988 wrote to memory of 2836	3988	Client.exe	90
PID 2836 wrote to memory of 4224	2836	cmd.exe	92
PID 2836 wrote to memory of 4224	2836	cmd.exe	92
PID 4744 wrote to memory of 3448	4744	cmd.exe	93
PID 4744 wrote to memory of 3448	4744	cmd.exe	93
PID 2836 wrote to memory of 3972	2836	cmd.exe	97
PID 2836 wrote to memory of 3972	2836	cmd.exe	97

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\Client.exe
"C:\Users\Admin\AppData\Local\Temp\Client.exe"
1⤵
- Checks computer location settings
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:3988
- C:\Windows\System32\cmd.exe
  "C:\Windows\System32\cmd.exe" /c schtasks /create /f /sc onlogon /rl highest /tn "." /tr '"C:\Users\Admin\AppData\Roaming\..exe"' & exit
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:4744
- - C:\Windows\system32\schtasks.exe
    schtasks /create /f /sc onlogon /rl highest /tn "." /tr '"C:\Users\Admin\AppData\Roaming\..exe"'
    3⤵
    - Scheduled Task/Job: Scheduled Task
    PID:3448
- C:\Windows\system32\cmd.exe
  C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\tmp9D2A.tmp.bat""
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:2836
- - C:\Windows\system32\timeout.exe
    timeout 3
    3⤵
    - Delays execution with timeout.exe
    PID:4224
- - C:\Users\Admin\AppData\Roaming\..exe
    "C:\Users\Admin\AppData\Roaming\..exe"
    3⤵
    - Executes dropped EXE
    - Suspicious use of AdjustPrivilegeToken
    PID:3972

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Scheduled Task/Job

1

T1053

Scheduled Task

1

T1053.005

Persistence

Scheduled Task/Job

1

T1053

Scheduled Task

1

T1053.005

Privilege Escalation

Scheduled Task/Job

1

T1053

Scheduled Task

1

T1053.005

Defense Evasion

Credential Access

Discovery

Query Registry

2

T1012

System Information Discovery

2

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

C:\Users\Admin\AppData\Local\Temp\tmp9D2A.tmp.bat

Filesize
145B

MD5
5f3dbf61924f90badde8573fcb68dbf9

SHA1
ac4aa157360e94c8a95408a6b797ad1b1166ab37

SHA256
91014554191740019ccceb67a3d132e764ee6a94d17f73a940eadd2d4da3154b

SHA512
68bde47a8e5575b745b714a926aee8837a1295bc442090c829a59eaa6916649acadf6abd14691a9a4c10bd6a0ef5d970b62867b8a7918a549be8c54082e87c09

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

Filesize
47KB

MD5
8a0bb8ae35abf7a92325e632a5a3adc0

SHA1
0042da0ec0b6f9c32a06becc845e0591870e410c

SHA256
8ef32b44cf21b690415e603eb6889c8c2e9294e76028b9dbd4c20a23077167f8

SHA512
ef89ad0def338bfab7e8fe435b1c964e62c56d0589721dda750e72b861492c6bccef7be95190b9df974e3bbfeda3e3f421eedb3d673cd45a7f3c5ce52b4a2fd4

Download Submit
memory/3972-14-0x000000001CA40000-0x000000001CAB6000-memory.dmp

Filesize
472KB

Download
memory/3972-15-0x00000000026F0000-0x0000000002700000-memory.dmp

Filesize
64KB

Download
memory/3972-16-0x000000001B280000-0x000000001B29E000-memory.dmp

Filesize
120KB

Download
memory/3988-0-0x00007FF9FF643000-0x00007FF9FF645000-memory.dmp

Filesize
8KB

Download
memory/3988-1-0x0000000000E00000-0x0000000000E12000-memory.dmp

Filesize
72KB

Download
memory/3988-2-0x00007FF9FF640000-0x00007FFA00101000-memory.dmp

Filesize
10.8MB

Download
memory/3988-7-0x00007FF9FF640000-0x00007FFA00101000-memory.dmp

Filesize
10.8MB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads