asyncrat | b7a9152f897cb11101d370f3b1ef30d411d4e4116a57ef31d340a58952cf4c1c

General

Target

AsyncClient.exe
Size

52KB
MD5

422b49a2404d8e67c9cd57d46acc97d0
SHA1

89ca4038856c67d12d31750a799aa88b08acfb82
SHA256

b7a9152f897cb11101d370f3b1ef30d411d4e4116a57ef31d340a58952cf4c1c
SHA512

2d9a65aacce93def1829971071b3c02c64555c0e30deca5ff8b12d04202e4b0a5e85cce8c7e61dfad1d966fe027086e7d18e1bf1c23dbe9695f2a8e082fdc77c
SSDEEP

1536:Ou4X9Tswb2vOnZH4fAzb03lKuIvLZQ7dqx:Ou4tTswb2vOnZH4fAb038L+7wx

Score

10^/10

asyncrat default discovery rat

Malware Config

Extracted

Family

asyncrat

Version

0.5.8

Botnet

Default

C2

x5sql-62870.portmap.host:62870

Mutex

c2VJpocLoXmn

Attributes

delay
3
install
true
install_file
Defender.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/0x00070000000120fc-13.dat	family_asyncrat

Executes dropped EXE 1 IoCs

pid	Process
2760	Defender.exe

Loads dropped DLL 1 IoCs

pid	Process
2996	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	Defender.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
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	schtasks.exe

Delays execution with timeout.exe 1 IoCs

evasion

pid	Process
2616	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
308	schtasks.exe

Suspicious behavior: EnumeratesProcesses 1 IoCs

pid	Process
2248	AsyncClient.exe

Suspicious use of AdjustPrivilegeToken 3 IoCs

description	pid	Process
Token: SeDebugPrivilege	2248	AsyncClient.exe
Token: SeDebugPrivilege	2760	Defender.exe
Token: SeDebugPrivilege	2760	Defender.exe

Suspicious use of WriteProcessMemory 20 IoCs

description	pid	Process	procid_target
PID 2248 wrote to memory of 3020	2248	AsyncClient.exe	31
PID 2248 wrote to memory of 3020	2248	AsyncClient.exe	31
PID 2248 wrote to memory of 3020	2248	AsyncClient.exe	31
PID 2248 wrote to memory of 3020	2248	AsyncClient.exe	31
PID 2248 wrote to memory of 2996	2248	AsyncClient.exe	33
PID 2248 wrote to memory of 2996	2248	AsyncClient.exe	33
PID 2248 wrote to memory of 2996	2248	AsyncClient.exe	33
PID 2248 wrote to memory of 2996	2248	AsyncClient.exe	33
PID 3020 wrote to memory of 308	3020	cmd.exe	35
PID 3020 wrote to memory of 308	3020	cmd.exe	35
PID 3020 wrote to memory of 308	3020	cmd.exe	35
PID 3020 wrote to memory of 308	3020	cmd.exe	35
PID 2996 wrote to memory of 2616	2996	cmd.exe	36
PID 2996 wrote to memory of 2616	2996	cmd.exe	36
PID 2996 wrote to memory of 2616	2996	cmd.exe	36
PID 2996 wrote to memory of 2616	2996	cmd.exe	36
PID 2996 wrote to memory of 2760	2996	cmd.exe	37
PID 2996 wrote to memory of 2760	2996	cmd.exe	37
PID 2996 wrote to memory of 2760	2996	cmd.exe	37
PID 2996 wrote to memory of 2760	2996	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:2248
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /c schtasks /create /f /sc onlogon /rl highest /tn "Defender" /tr '"C:\Users\Admin\AppData\Roaming\Defender.exe"' & exit
  2⤵
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:3020
- - C:\Windows\SysWOW64\schtasks.exe
    schtasks /create /f /sc onlogon /rl highest /tn "Defender" /tr '"C:\Users\Admin\AppData\Roaming\Defender.exe"'
    3⤵
    - System Location Discovery: System Language Discovery
    - Scheduled Task/Job: Scheduled Task
    PID:308
- C:\Windows\SysWOW64\cmd.exe
  cmd /c ""C:\Users\Admin\AppData\Local\Temp\tmpF7C7.tmp.bat""
  2⤵
  - Loads dropped DLL
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:2996
- - C:\Windows\SysWOW64\timeout.exe
    timeout 3
    3⤵
    - System Location Discovery: System Language Discovery
    - Delays execution with timeout.exe
    PID:2616
- - C:\Users\Admin\AppData\Roaming\Defender.exe
    "C:\Users\Admin\AppData\Roaming\Defender.exe"
    3⤵
    - Executes dropped EXE
    - System Location Discovery: System Language Discovery
    - Suspicious use of AdjustPrivilegeToken
    PID:2760

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\tmpF7C7.tmp.bat

Filesize
152B

MD5
c9d76bd563ef67cb2eeeb8e441dd1e01

SHA1
a26a8d542fb520f6a32635a8504ac3b6853a77c4

SHA256
9ccbbf5665b569cd4984b9296654072e3ac8466026dc205e65d82fbbf21ffac4

SHA512
f87ca168b112050ccadc78d24367adc1cbfca5fb5ac3d38eb1f100f0f9179c593b1417d632b576cd1af616edd86e494dc15fd8c2a7cdbef852163fa4c2c98cf2

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

Filesize
52KB

MD5
422b49a2404d8e67c9cd57d46acc97d0

SHA1
89ca4038856c67d12d31750a799aa88b08acfb82

SHA256
b7a9152f897cb11101d370f3b1ef30d411d4e4116a57ef31d340a58952cf4c1c

SHA512
2d9a65aacce93def1829971071b3c02c64555c0e30deca5ff8b12d04202e4b0a5e85cce8c7e61dfad1d966fe027086e7d18e1bf1c23dbe9695f2a8e082fdc77c

Download Submit
memory/2248-0-0x00000000744DE000-0x00000000744DF000-memory.dmp

Filesize
4KB

Download
memory/2248-1-0x0000000000F40000-0x0000000000F52000-memory.dmp

Filesize
72KB

Download
memory/2248-2-0x00000000744D0000-0x0000000074BBE000-memory.dmp

Filesize
6.9MB

Download
memory/2248-11-0x00000000744D0000-0x0000000074BBE000-memory.dmp

Filesize
6.9MB

Download
memory/2760-16-0x0000000000210000-0x0000000000222000-memory.dmp

Filesize
72KB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads