asyncrat | 81f5935378ad95fa4e518c2c988a680e6007782f63407f7a8de4288099046b98

General

Target

AsyncClient.exe
Size

47KB
MD5

39871b589b22de667d85fd96b2ca9769
SHA1

5e2e354f487d500e165437cd32763ace72dad42e
SHA256

81f5935378ad95fa4e518c2c988a680e6007782f63407f7a8de4288099046b98
SHA512

7bd31f0671ac192dc637952993c6f2e3bf4d7a6801b268c7e31bbf41fcfd1703a582fdd3f1b96447d60a220efe40e08397862f0ad8b3d6c1600079c5a4426b51
SSDEEP

768:Yu1a21T3EiJfWUzDydmo2qzq4cWJG6Pb7cPITmg7TJN0bbNEQvO/KElT61yladBQ:Yu1a21T3xq2VCFpTmWYbbq5w1yCdYx

Score

10^/10

asyncrat default discovery rat

Malware Config

Extracted

Family

asyncrat

Version

0.5.8

Botnet

Default

C2

operation-involvement.gl.at.ply.gg:6636

Mutex

mQonSi9jaT6q

Attributes

delay
3
install
true
install_file
system.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

Processes:

resource	yara_rule
behavioral1/files/0x0004000000004ed7-14.dat	family_asyncrat

Executes dropped EXE 1 IoCs

Processes:

system.exe

pid	Process
2564	system.exe

Loads dropped DLL 1 IoCs

Processes:

cmd.exe

pid	Process
2700	cmd.exe

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

System Information Discovery
T1082

System Location Discovery: System Language Discovery 1 TTPs 6 IoCs

Attempt gather information about the system language of a victim in order to infer the geographical location of that host.

discovery

System Language Discovery

T1614.001

Processes:

cmd.execmd.exeschtasks.exetimeout.exesystem.exeAsyncClient.exe

description	ioc	Process
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	cmd.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	cmd.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	schtasks.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	timeout.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	system.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	AsyncClient.exe

Delays execution with timeout.exe 1 IoCs

evasion

Processes:

timeout.exe

pid	Process
2816	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

Processes:

schtasks.exe

pid	Process
2880	schtasks.exe

Suspicious behavior: EnumeratesProcesses 3 IoCs

Processes:

AsyncClient.exe

pid	Process
3024	AsyncClient.exe
3024	AsyncClient.exe
3024	AsyncClient.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

Processes:

AsyncClient.exesystem.exe

description	pid	Process
Token: SeDebugPrivilege	3024	AsyncClient.exe
Token: SeDebugPrivilege	2564	system.exe

Suspicious use of WriteProcessMemory 20 IoCs

Processes:

AsyncClient.execmd.execmd.exe

description	pid	Process	procid_target
PID 3024 wrote to memory of 2672	3024	AsyncClient.exe	31
PID 3024 wrote to memory of 2672	3024	AsyncClient.exe	31
PID 3024 wrote to memory of 2672	3024	AsyncClient.exe	31
PID 3024 wrote to memory of 2672	3024	AsyncClient.exe	31
PID 3024 wrote to memory of 2700	3024	AsyncClient.exe	33
PID 3024 wrote to memory of 2700	3024	AsyncClient.exe	33
PID 3024 wrote to memory of 2700	3024	AsyncClient.exe	33
PID 3024 wrote to memory of 2700	3024	AsyncClient.exe	33
PID 2672 wrote to memory of 2880	2672	cmd.exe	35
PID 2672 wrote to memory of 2880	2672	cmd.exe	35
PID 2672 wrote to memory of 2880	2672	cmd.exe	35
PID 2672 wrote to memory of 2880	2672	cmd.exe	35
PID 2700 wrote to memory of 2816	2700	cmd.exe	36
PID 2700 wrote to memory of 2816	2700	cmd.exe	36
PID 2700 wrote to memory of 2816	2700	cmd.exe	36
PID 2700 wrote to memory of 2816	2700	cmd.exe	36
PID 2700 wrote to memory of 2564	2700	cmd.exe	37
PID 2700 wrote to memory of 2564	2700	cmd.exe	37
PID 2700 wrote to memory of 2564	2700	cmd.exe	37
PID 2700 wrote to memory of 2564	2700	cmd.exe	37

C:\Users\Admin\AppData\Local\Temp\AsyncClient.exe
"C:\Users\Admin\AppData\Local\Temp\AsyncClient.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:3024
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /c schtasks /create /f /sc onlogon /rl highest /tn "system" /tr '"C:\Users\Admin\AppData\Roaming\system.exe"' & exit
  2⤵
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:2672
- - C:\Windows\SysWOW64\schtasks.exe
    schtasks /create /f /sc onlogon /rl highest /tn "system" /tr '"C:\Users\Admin\AppData\Roaming\system.exe"'
    3⤵
    - System Location Discovery: System Language Discovery
    - Scheduled Task/Job: Scheduled Task
    PID:2880
- C:\Windows\SysWOW64\cmd.exe
  cmd /c ""C:\Users\Admin\AppData\Local\Temp\tmp1.tmp.bat""
  2⤵
  - Loads dropped DLL
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:2700
- - C:\Windows\SysWOW64\timeout.exe
    timeout 3
    3⤵
    - System Location Discovery: System Language Discovery
    - Delays execution with timeout.exe
    PID:2816
- - C:\Users\Admin\AppData\Roaming\system.exe
    "C:\Users\Admin\AppData\Roaming\system.exe"
    3⤵
    - Executes dropped EXE
    - System Location Discovery: System Language Discovery
    - Suspicious use of AdjustPrivilegeToken
    PID:2564

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

System Information Discovery

1

T1082

System Location Discovery

1

T1614

System Language Discovery

1

T1614.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

C:\Users\Admin\AppData\Local\Temp\tmp1.tmp.bat

Filesize
147B

MD5
e6e1d1a984af08f36ca03f81ecb59ae9

SHA1
f4a7b0c7b342766c10801ae4c0c1ad9feadcfaac

SHA256
1d4dde09634f6fb2b85a7cd8e80692315a1ffa17a6232a006c08c509ffa03ecc

SHA512
c7826f36f28b2eddcee54d6ae0951ebdf7a8ac1a23b1da00553d1893a6ab68b017821bfab0fbafcc5724e0926bae39b2840a1f8db262cc4fd4a6f1f6c69ed974

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

Filesize
47KB

MD5
39871b589b22de667d85fd96b2ca9769

SHA1
5e2e354f487d500e165437cd32763ace72dad42e

SHA256
81f5935378ad95fa4e518c2c988a680e6007782f63407f7a8de4288099046b98

SHA512
7bd31f0671ac192dc637952993c6f2e3bf4d7a6801b268c7e31bbf41fcfd1703a582fdd3f1b96447d60a220efe40e08397862f0ad8b3d6c1600079c5a4426b51

Download Submit
memory/2564-16-0x00000000003E0000-0x00000000003F2000-memory.dmp

Filesize
72KB

Download
memory/3024-0-0x000000007469E000-0x000000007469F000-memory.dmp

Filesize
4KB

Download
memory/3024-1-0x0000000000340000-0x0000000000352000-memory.dmp

Filesize
72KB

Download
memory/3024-2-0x0000000074690000-0x0000000074D7E000-memory.dmp

Filesize
6.9MB

Download
memory/3024-12-0x0000000074690000-0x0000000074D7E000-memory.dmp

Filesize
6.9MB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads