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
behavioral2/files/0x0008000000023c7c-11.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

Processes:

AsyncClient.exe

description	ioc	Process
Key value queried	\REGISTRY\USER\S-1-5-21-1045960512-3948844814-3059691613-1000\Control Panel\International\Geo\Nation	AsyncClient.exe

Executes dropped EXE 1 IoCs

Processes:

system.exe

pid	Process
4256	system.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:

AsyncClient.execmd.execmd.exeschtasks.exetimeout.exesystem.exe

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

Delays execution with timeout.exe 1 IoCs

evasion

Processes:

timeout.exe

pid	Process
3152	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
3832	schtasks.exe

Suspicious behavior: EnumeratesProcesses 23 IoCs

Processes:

AsyncClient.exe

pid	Process
4448	AsyncClient.exe
4448	AsyncClient.exe
4448	AsyncClient.exe
4448	AsyncClient.exe
4448	AsyncClient.exe
4448	AsyncClient.exe
4448	AsyncClient.exe
4448	AsyncClient.exe
4448	AsyncClient.exe
4448	AsyncClient.exe
4448	AsyncClient.exe
4448	AsyncClient.exe
4448	AsyncClient.exe
4448	AsyncClient.exe
4448	AsyncClient.exe
4448	AsyncClient.exe
4448	AsyncClient.exe
4448	AsyncClient.exe
4448	AsyncClient.exe
4448	AsyncClient.exe
4448	AsyncClient.exe
4448	AsyncClient.exe
4448	AsyncClient.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

Processes:

AsyncClient.exesystem.exe

description	pid	Process
Token: SeDebugPrivilege	4448	AsyncClient.exe
Token: SeDebugPrivilege	4256	system.exe

Suspicious use of WriteProcessMemory 15 IoCs

Processes:

AsyncClient.execmd.execmd.exe

description	pid	Process	procid_target
PID 4448 wrote to memory of 2068	4448	AsyncClient.exe	87
PID 4448 wrote to memory of 2068	4448	AsyncClient.exe	87
PID 4448 wrote to memory of 2068	4448	AsyncClient.exe	87
PID 4448 wrote to memory of 4440	4448	AsyncClient.exe	89
PID 4448 wrote to memory of 4440	4448	AsyncClient.exe	89
PID 4448 wrote to memory of 4440	4448	AsyncClient.exe	89
PID 4440 wrote to memory of 3152	4440	cmd.exe	91
PID 4440 wrote to memory of 3152	4440	cmd.exe	91
PID 4440 wrote to memory of 3152	4440	cmd.exe	91
PID 2068 wrote to memory of 3832	2068	cmd.exe	92
PID 2068 wrote to memory of 3832	2068	cmd.exe	92
PID 2068 wrote to memory of 3832	2068	cmd.exe	92
PID 4440 wrote to memory of 4256	4440	cmd.exe	97
PID 4440 wrote to memory of 4256	4440	cmd.exe	97
PID 4440 wrote to memory of 4256	4440	cmd.exe	97

C:\Users\Admin\AppData\Local\Temp\AsyncClient.exe
"C:\Users\Admin\AppData\Local\Temp\AsyncClient.exe"
1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:4448
- 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:2068
- - 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:3832
- C:\Windows\SysWOW64\cmd.exe
  C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\tmp9AF8.tmp.bat""
  2⤵
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:4440
- - C:\Windows\SysWOW64\timeout.exe
    timeout 3
    3⤵
    - System Location Discovery: System Language Discovery
    - Delays execution with timeout.exe
    PID:3152
- - 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:4256

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

1

T1012

System Information Discovery

2

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\tmp9AF8.tmp.bat

Filesize
150B

MD5
bc9614b9452f37c181fb566a48aa088d

SHA1
9ca9f5421a6883a6accd62612a70e3f66264d576

SHA256
c0b304a54fa951752c7e8ac82f9600ae2766cfca34100b86f155a0d52c0b6dff

SHA512
3745b9d976c406c828ae9a991f9b16f6b59444b8ac2fb2aef43a0f69e8dfa015dba148467727b2c32a467e147c898d702fc689e45c7310859464e4d969d50086

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

Filesize
47KB

MD5
39871b589b22de667d85fd96b2ca9769

SHA1
5e2e354f487d500e165437cd32763ace72dad42e

SHA256
81f5935378ad95fa4e518c2c988a680e6007782f63407f7a8de4288099046b98

SHA512
7bd31f0671ac192dc637952993c6f2e3bf4d7a6801b268c7e31bbf41fcfd1703a582fdd3f1b96447d60a220efe40e08397862f0ad8b3d6c1600079c5a4426b51

Download Submit
memory/4256-13-0x0000000074C40000-0x00000000753F0000-memory.dmp

Filesize
7.7MB

Download
memory/4256-14-0x0000000074C40000-0x00000000753F0000-memory.dmp

Filesize
7.7MB

Download
memory/4448-0-0x0000000074CEE000-0x0000000074CEF000-memory.dmp

Filesize
4KB

Download
memory/4448-1-0x0000000000400000-0x0000000000412000-memory.dmp

Filesize
72KB

Download
memory/4448-2-0x0000000074CE0000-0x0000000075490000-memory.dmp

Filesize
7.7MB

Download
memory/4448-3-0x0000000004E40000-0x0000000004EDC000-memory.dmp

Filesize
624KB

Download
memory/4448-9-0x0000000074CE0000-0x0000000075490000-memory.dmp

Filesize
7.7MB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads