asyncrat | 81f5935378ad95fa4e518c2c988a680e6007782f63407f7a8de4288099046b98

Analysis

max time kernel
130s
max time network
154s
platform
windows11-21h2_x64
resource
win11-20241007-en
resource tags

arch:x64arch:x86image:win11-20241007-enlocale:en-usos:windows11-21h2-x64system
submitted
25-11-2024 18:15

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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

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/0x001c00000002aa63-11.dat	family_asyncrat

Executes dropped EXE 1 IoCs

Processes:

system.exe

pid	Process
2168	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:

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

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

Checks SCSI registry key(s) 3 TTPs 3 IoCs

SCSI information is often read in order to detect sandboxing environments.

Query Registry

T1012

Peripheral Device Discovery

T1120

System Information Discovery

T1082

Processes:

taskmgr.exe

description	ioc	Process
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Enum\SCSI\Disk&Ven_WDC&Prod_WDS100T2B0A\4&215468a5&0&000000	taskmgr.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Enum\SCSI\Disk&Ven_WDC&Prod_WDS100T2B0A\4&215468a5&0&000000\Properties\{b725f130-47ef-101a-a5f1-02608c9eebac}\000A	taskmgr.exe
Key value queried	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Enum\SCSI\Disk&Ven_WDC&Prod_WDS100T2B0A\4&215468a5&0&000000\FriendlyName	taskmgr.exe

Checks processor information in registry 2 TTPs 2 IoCs

Processor information is often read in order to detect sandboxing environments.

Query Registry

T1012

System Information Discovery

T1082

Processes:

taskmgr.exe

description	ioc	Process
Key opened	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0	taskmgr.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\ProcessorNameString	taskmgr.exe

Delays execution with timeout.exe 1 IoCs

evasion

Processes:

timeout.exe

pid	Process
788	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
3964	schtasks.exe

Suspicious behavior: EnumeratesProcesses 64 IoCs

Processes:

AsyncClient.exetaskmgr.exe

pid	Process
4244	AsyncClient.exe
4244	AsyncClient.exe
4244	AsyncClient.exe
4244	AsyncClient.exe
4244	AsyncClient.exe
4244	AsyncClient.exe
4244	AsyncClient.exe
4244	AsyncClient.exe
4244	AsyncClient.exe
4244	AsyncClient.exe
4244	AsyncClient.exe
4244	AsyncClient.exe
4244	AsyncClient.exe
4244	AsyncClient.exe
4244	AsyncClient.exe
4244	AsyncClient.exe
4244	AsyncClient.exe
1360	taskmgr.exe
1360	taskmgr.exe
1360	taskmgr.exe
1360	taskmgr.exe
1360	taskmgr.exe
1360	taskmgr.exe
1360	taskmgr.exe
1360	taskmgr.exe
1360	taskmgr.exe
1360	taskmgr.exe
1360	taskmgr.exe
1360	taskmgr.exe
1360	taskmgr.exe
1360	taskmgr.exe
1360	taskmgr.exe
1360	taskmgr.exe
1360	taskmgr.exe
1360	taskmgr.exe
1360	taskmgr.exe
1360	taskmgr.exe
1360	taskmgr.exe
1360	taskmgr.exe
1360	taskmgr.exe
1360	taskmgr.exe
1360	taskmgr.exe
1360	taskmgr.exe
1360	taskmgr.exe
1360	taskmgr.exe
1360	taskmgr.exe
1360	taskmgr.exe
1360	taskmgr.exe
1360	taskmgr.exe
1360	taskmgr.exe
1360	taskmgr.exe
1360	taskmgr.exe
1360	taskmgr.exe
1360	taskmgr.exe
1360	taskmgr.exe
1360	taskmgr.exe
1360	taskmgr.exe
1360	taskmgr.exe
1360	taskmgr.exe
1360	taskmgr.exe
1360	taskmgr.exe
1360	taskmgr.exe
1360	taskmgr.exe
1360	taskmgr.exe

Suspicious behavior: GetForegroundWindowSpam 1 IoCs

Processes:

taskmgr.exe

pid	Process
1360	taskmgr.exe

Suspicious use of AdjustPrivilegeToken 5 IoCs

Processes:

AsyncClient.exesystem.exetaskmgr.exe

description	pid	Process
Token: SeDebugPrivilege	4244	AsyncClient.exe
Token: SeDebugPrivilege	2168	system.exe
Token: SeDebugPrivilege	1360	taskmgr.exe
Token: SeSystemProfilePrivilege	1360	taskmgr.exe
Token: SeCreateGlobalPrivilege	1360	taskmgr.exe

Suspicious use of FindShellTrayWindow 64 IoCs

Processes:

taskmgr.exe

pid	Process
1360	taskmgr.exe
1360	taskmgr.exe
1360	taskmgr.exe
1360	taskmgr.exe
1360	taskmgr.exe
1360	taskmgr.exe
1360	taskmgr.exe
1360	taskmgr.exe
1360	taskmgr.exe
1360	taskmgr.exe
1360	taskmgr.exe
1360	taskmgr.exe
1360	taskmgr.exe
1360	taskmgr.exe
1360	taskmgr.exe
1360	taskmgr.exe
1360	taskmgr.exe
1360	taskmgr.exe
1360	taskmgr.exe
1360	taskmgr.exe
1360	taskmgr.exe
1360	taskmgr.exe
1360	taskmgr.exe
1360	taskmgr.exe
1360	taskmgr.exe
1360	taskmgr.exe
1360	taskmgr.exe
1360	taskmgr.exe
1360	taskmgr.exe
1360	taskmgr.exe
1360	taskmgr.exe
1360	taskmgr.exe
1360	taskmgr.exe
1360	taskmgr.exe
1360	taskmgr.exe
1360	taskmgr.exe
1360	taskmgr.exe
1360	taskmgr.exe
1360	taskmgr.exe
1360	taskmgr.exe
1360	taskmgr.exe
1360	taskmgr.exe
1360	taskmgr.exe
1360	taskmgr.exe
1360	taskmgr.exe
1360	taskmgr.exe
1360	taskmgr.exe
1360	taskmgr.exe
1360	taskmgr.exe
1360	taskmgr.exe
1360	taskmgr.exe
1360	taskmgr.exe
1360	taskmgr.exe
1360	taskmgr.exe
1360	taskmgr.exe
1360	taskmgr.exe
1360	taskmgr.exe
1360	taskmgr.exe
1360	taskmgr.exe
1360	taskmgr.exe
1360	taskmgr.exe
1360	taskmgr.exe
1360	taskmgr.exe
1360	taskmgr.exe

Suspicious use of SendNotifyMessage 64 IoCs

Processes:

taskmgr.exe

pid	Process
1360	taskmgr.exe
1360	taskmgr.exe
1360	taskmgr.exe
1360	taskmgr.exe
1360	taskmgr.exe
1360	taskmgr.exe
1360	taskmgr.exe
1360	taskmgr.exe
1360	taskmgr.exe
1360	taskmgr.exe
1360	taskmgr.exe
1360	taskmgr.exe
1360	taskmgr.exe
1360	taskmgr.exe
1360	taskmgr.exe
1360	taskmgr.exe
1360	taskmgr.exe
1360	taskmgr.exe
1360	taskmgr.exe
1360	taskmgr.exe
1360	taskmgr.exe
1360	taskmgr.exe
1360	taskmgr.exe
1360	taskmgr.exe
1360	taskmgr.exe
1360	taskmgr.exe
1360	taskmgr.exe
1360	taskmgr.exe
1360	taskmgr.exe
1360	taskmgr.exe
1360	taskmgr.exe
1360	taskmgr.exe
1360	taskmgr.exe
1360	taskmgr.exe
1360	taskmgr.exe
1360	taskmgr.exe
1360	taskmgr.exe
1360	taskmgr.exe
1360	taskmgr.exe
1360	taskmgr.exe
1360	taskmgr.exe
1360	taskmgr.exe
1360	taskmgr.exe
1360	taskmgr.exe
1360	taskmgr.exe
1360	taskmgr.exe
1360	taskmgr.exe
1360	taskmgr.exe
1360	taskmgr.exe
1360	taskmgr.exe
1360	taskmgr.exe
1360	taskmgr.exe
1360	taskmgr.exe
1360	taskmgr.exe
1360	taskmgr.exe
1360	taskmgr.exe
1360	taskmgr.exe
1360	taskmgr.exe
1360	taskmgr.exe
1360	taskmgr.exe
1360	taskmgr.exe
1360	taskmgr.exe
1360	taskmgr.exe
1360	taskmgr.exe

Suspicious use of WriteProcessMemory 15 IoCs

Processes:

AsyncClient.execmd.execmd.exe

description	pid	Process	procid_target
PID 4244 wrote to memory of 1552	4244	AsyncClient.exe	77
PID 4244 wrote to memory of 1552	4244	AsyncClient.exe	77
PID 4244 wrote to memory of 1552	4244	AsyncClient.exe	77
PID 4244 wrote to memory of 3492	4244	AsyncClient.exe	79
PID 4244 wrote to memory of 3492	4244	AsyncClient.exe	79
PID 4244 wrote to memory of 3492	4244	AsyncClient.exe	79
PID 1552 wrote to memory of 3964	1552	cmd.exe	81
PID 1552 wrote to memory of 3964	1552	cmd.exe	81
PID 1552 wrote to memory of 3964	1552	cmd.exe	81
PID 3492 wrote to memory of 788	3492	cmd.exe	82
PID 3492 wrote to memory of 788	3492	cmd.exe	82
PID 3492 wrote to memory of 788	3492	cmd.exe	82
PID 3492 wrote to memory of 2168	3492	cmd.exe	83
PID 3492 wrote to memory of 2168	3492	cmd.exe	83
PID 3492 wrote to memory of 2168	3492	cmd.exe	83

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:4244
- 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:1552
- - 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:3964
- C:\Windows\SysWOW64\cmd.exe
  C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\tmp7B3B.tmp.bat""
  2⤵
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:3492
- - C:\Windows\SysWOW64\timeout.exe
    timeout 3
    3⤵
    - System Location Discovery: System Language Discovery
    - Delays execution with timeout.exe
    PID:788
- - 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:2168

C:\Windows\system32\taskmgr.exe
"C:\Windows\system32\taskmgr.exe" /0
1⤵
- Checks SCSI registry key(s)
- Checks processor information in registry
- Suspicious behavior: EnumeratesProcesses
- Suspicious behavior: GetForegroundWindowSpam
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of FindShellTrayWindow
- Suspicious use of SendNotifyMessage
PID:1360

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Scheduled Task/Job

T1053

Scheduled Task

T1053.005

Persistence

Scheduled Task/Job

T1053

Scheduled Task

T1053.005

Privilege Escalation

Scheduled Task/Job

T1053

Scheduled Task

T1053.005

Defense Evasion

Credential Access

Discovery

Peripheral Device Discovery

T1120

Query Registry

T1012

System Information Discovery

T1082

System Location Discovery

T1614

System Language Discovery

T1614.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

C:\Users\Admin\AppData\Local\Temp\tmp7B3B.tmp.bat

Filesize
150B

MD5
916f2ee475a821fc2243863dbe46cf08

SHA1
f7e417153270d74d74ea90ba6eaac2ee3dc2f840

SHA256
dc4462d1b7840f88b92dbc1aef68317d1d36059228926ba4e861f6ade4ca5dbf

SHA512
ed94be013b5661c8410bbfc8cc0e1a558c978895fd6a4cda89c5c993776991ab50f0c1dacb592662ddef236d0a4ada1bb3100d771ddfb2a61c11879d7a636525

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

Filesize
47KB

MD5
39871b589b22de667d85fd96b2ca9769

SHA1
5e2e354f487d500e165437cd32763ace72dad42e

SHA256
81f5935378ad95fa4e518c2c988a680e6007782f63407f7a8de4288099046b98

SHA512
7bd31f0671ac192dc637952993c6f2e3bf4d7a6801b268c7e31bbf41fcfd1703a582fdd3f1b96447d60a220efe40e08397862f0ad8b3d6c1600079c5a4426b51

Download Submit
memory/1360-19-0x000002271D3B0000-0x000002271D3B1000-memory.dmp

Filesize
4KB

Download
memory/1360-29-0x000002271D3B0000-0x000002271D3B1000-memory.dmp

Filesize
4KB

Download
memory/1360-24-0x000002271D3B0000-0x000002271D3B1000-memory.dmp

Filesize
4KB

Download
memory/1360-27-0x000002271D3B0000-0x000002271D3B1000-memory.dmp

Filesize
4KB

Download
memory/1360-26-0x000002271D3B0000-0x000002271D3B1000-memory.dmp

Filesize
4KB

Download
memory/1360-28-0x000002271D3B0000-0x000002271D3B1000-memory.dmp

Filesize
4KB

Download
memory/1360-25-0x000002271D3B0000-0x000002271D3B1000-memory.dmp

Filesize
4KB

Download
memory/1360-30-0x000002271D3B0000-0x000002271D3B1000-memory.dmp

Filesize
4KB

Download
memory/1360-18-0x000002271D3B0000-0x000002271D3B1000-memory.dmp

Filesize
4KB

Download
memory/1360-20-0x000002271D3B0000-0x000002271D3B1000-memory.dmp

Filesize
4KB

Download
memory/2168-16-0x0000000005A50000-0x0000000005FF6000-memory.dmp

Filesize
5.6MB

Download
memory/2168-32-0x00000000064C0000-0x0000000006536000-memory.dmp

Filesize
472KB

Download
memory/2168-36-0x0000000006750000-0x00000000067C8000-memory.dmp

Filesize
480KB

Download
memory/2168-17-0x0000000004F90000-0x0000000004FF6000-memory.dmp

Filesize
408KB

Download
memory/2168-34-0x0000000006570000-0x000000000658E000-memory.dmp

Filesize
120KB

Download
memory/2168-13-0x0000000074830000-0x0000000074FE1000-memory.dmp

Filesize
7.7MB

Download
memory/2168-35-0x00000000068A0000-0x0000000006932000-memory.dmp

Filesize
584KB

Download
memory/2168-33-0x0000000006440000-0x00000000064A8000-memory.dmp

Filesize
416KB

Download
memory/2168-31-0x0000000074830000-0x0000000074FE1000-memory.dmp

Filesize
7.7MB

Download
memory/4244-3-0x0000000004EB0000-0x0000000004F4C000-memory.dmp

Filesize
624KB

Download
memory/4244-2-0x00000000748A0000-0x0000000075051000-memory.dmp

Filesize
7.7MB

Download
memory/4244-9-0x00000000748A0000-0x0000000075051000-memory.dmp

Filesize
7.7MB

Download
memory/4244-1-0x00000000003C0000-0x00000000003D2000-memory.dmp

Filesize
72KB

Download
memory/4244-0-0x00000000748AE000-0x00000000748AF000-memory.dmp

Filesize
4KB

Download