asyncrat | 44b6e2af6e5e547cfc9c2c3607bd7cda4785688b60720c5501968b536ce331c9

General

Target

AsyncClient.exe
Size

47KB
MD5

ee97dc0328ea5ef92cdadeb280891591
SHA1

916924ecdb96aa0ec227b12df2af8f5038f239ab
SHA256

44b6e2af6e5e547cfc9c2c3607bd7cda4785688b60720c5501968b536ce331c9
SHA512

52ecca0f00d47f9bffc50bb516988715ae2c1aaf96f3a5bb132619ebbd8a370c9eef0f33d5b67accc2ffe2187e60564fa353eef037b35be9159f17aad6e621c2
SSDEEP

768:Zu6ZdTAYhbJWUh9Nzmo2qLxRQSJPVW1QMCfPIKSxlJpmqH0bAYpHZ+6GGAPMtV0g:Zu6ZdTAur2uQadMC4KSrvUbAYqMAknkU

Score

10^/10

asyncrat default discovery rat

Malware Config

Extracted

Family

asyncrat

Version

0.5.8

Botnet

Default

C2

listed-academics.gl.at.ply.gg:10068

Mutex

f7BTmla4eysw

Attributes

delay
3
install
true
install_file
das.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
behavioral1/files/0x000800000001932a-13.dat	family_asyncrat

Executes dropped EXE 1 IoCs

pid	Process
2900	das.exe

Loads dropped DLL 1 IoCs

pid	Process
3000	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

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

Delays execution with timeout.exe 1 IoCs

evasion

pid	Process
1780	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
1516	schtasks.exe

Suspicious behavior: EnumeratesProcesses 3 IoCs

pid	Process
2652	AsyncClient.exe
2652	AsyncClient.exe
2652	AsyncClient.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	2652	AsyncClient.exe
Token: SeDebugPrivilege	2900	das.exe

Suspicious use of WriteProcessMemory 20 IoCs

description	pid	Process	procid_target
PID 2652 wrote to memory of 2300	2652	AsyncClient.exe	31
PID 2652 wrote to memory of 2300	2652	AsyncClient.exe	31
PID 2652 wrote to memory of 2300	2652	AsyncClient.exe	31
PID 2652 wrote to memory of 2300	2652	AsyncClient.exe	31
PID 2652 wrote to memory of 3000	2652	AsyncClient.exe	33
PID 2652 wrote to memory of 3000	2652	AsyncClient.exe	33
PID 2652 wrote to memory of 3000	2652	AsyncClient.exe	33
PID 2652 wrote to memory of 3000	2652	AsyncClient.exe	33
PID 2300 wrote to memory of 1516	2300	cmd.exe	35
PID 2300 wrote to memory of 1516	2300	cmd.exe	35
PID 2300 wrote to memory of 1516	2300	cmd.exe	35
PID 2300 wrote to memory of 1516	2300	cmd.exe	35
PID 3000 wrote to memory of 1780	3000	cmd.exe	36
PID 3000 wrote to memory of 1780	3000	cmd.exe	36
PID 3000 wrote to memory of 1780	3000	cmd.exe	36
PID 3000 wrote to memory of 1780	3000	cmd.exe	36
PID 3000 wrote to memory of 2900	3000	cmd.exe	37
PID 3000 wrote to memory of 2900	3000	cmd.exe	37
PID 3000 wrote to memory of 2900	3000	cmd.exe	37
PID 3000 wrote to memory of 2900	3000	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:2652
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /c schtasks /create /f /sc onlogon /rl highest /tn "das" /tr '"C:\Users\Admin\AppData\Roaming\das.exe"' & exit
  2⤵
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:2300
- - C:\Windows\SysWOW64\schtasks.exe
    schtasks /create /f /sc onlogon /rl highest /tn "das" /tr '"C:\Users\Admin\AppData\Roaming\das.exe"'
    3⤵
    - System Location Discovery: System Language Discovery
    - Scheduled Task/Job: Scheduled Task
    PID:1516
- C:\Windows\SysWOW64\cmd.exe
  cmd /c ""C:\Users\Admin\AppData\Local\Temp\tmpDAC5.tmp.bat""
  2⤵
  - Loads dropped DLL
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:3000
- - C:\Windows\SysWOW64\timeout.exe
    timeout 3
    3⤵
    - System Location Discovery: System Language Discovery
    - Delays execution with timeout.exe
    PID:1780
- - C:\Users\Admin\AppData\Roaming\das.exe
    "C:\Users\Admin\AppData\Roaming\das.exe"
    3⤵
    - Executes dropped EXE
    - System Location Discovery: System Language Discovery
    - Suspicious use of AdjustPrivilegeToken
    PID:2900

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\tmpDAC5.tmp.bat

Filesize
147B

MD5
e9a5a6dba9efe7fe40c1c8a4643e02aa

SHA1
1bb333c33d0c7a907fdc9badb5e855d6d5914c64

SHA256
819336b31ab119c2de975b2267ce2455af32a5753247db92952e17e56fc2cda3

SHA512
db112bec9a1d2e79cd5c80557eb08ed7fe8341f9780d5a8e436a9d49991f85b5c03ad42658f91e2120df65159cc3cd48f9d485e5280f9dd2514ff64829b7acf2

Download Submit
\Users\Admin\AppData\Roaming\das.exe

Filesize
47KB

MD5
ee97dc0328ea5ef92cdadeb280891591

SHA1
916924ecdb96aa0ec227b12df2af8f5038f239ab

SHA256
44b6e2af6e5e547cfc9c2c3607bd7cda4785688b60720c5501968b536ce331c9

SHA512
52ecca0f00d47f9bffc50bb516988715ae2c1aaf96f3a5bb132619ebbd8a370c9eef0f33d5b67accc2ffe2187e60564fa353eef037b35be9159f17aad6e621c2

Download Submit
memory/2652-0-0x00000000748CE000-0x00000000748CF000-memory.dmp

Filesize
4KB

Download
memory/2652-1-0x0000000000940000-0x0000000000952000-memory.dmp

Filesize
72KB

Download
memory/2652-2-0x00000000748C0000-0x0000000074FAE000-memory.dmp

Filesize
6.9MB

Download
memory/2652-12-0x00000000748C0000-0x0000000074FAE000-memory.dmp

Filesize
6.9MB

Download
memory/2900-16-0x0000000000DD0000-0x0000000000DE2000-memory.dmp

Filesize
72KB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads