asyncrat | 7d41f2fe756509c85b54522b30bc26bfedfaff42ead65e82d6de9c67c03a06d8

General

Target

AsyncClient.exe
Size

48KB
MD5

a133aa15dff0878b51f78a73f26dcb75
SHA1

496da7070019ed5d6f0e113a2a456b6417f5fba8
SHA256

7d41f2fe756509c85b54522b30bc26bfedfaff42ead65e82d6de9c67c03a06d8
SHA512

9a7fef9d09697a71f8ce0e44a8bac041d8a7bec31a9c7c3bddc3efaecb0145a2ff96767e9ca19eca3384c6333263cf3ec55be125236a275bee7a857ccfce2fca
SSDEEP

768:quE6VTnk6gWXWUrjC1mo2qDG8VNe6X7ItFjPIBpX/bRbbYaCvRzT6Mo53J8icbfc:quE6VTn8H2FB6X84Bd/1bYrd66icjwBn

Score

10^/10

asyncrat default discovery rat

Malware Config

Extracted

Family

asyncrat

Version

0.5.8

Botnet

Default

C2

127.0.0.1:6606

127.0.0.1:8808

127.0.0.1:2009

127.0.0.1:7007

Mutex

kLnHtBuoFosw

Attributes

delay
10
install
true
install_file
InstallerPeclient1.21.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/0x000600000002a868-14.dat	family_asyncrat

Executes dropped EXE 1 IoCs

Processes:

InstallerPeclient1.21.exe

pid	Process
904	InstallerPeclient1.21.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.exeschtasks.execmd.exetimeout.exeInstallerPeclient1.21.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	schtasks.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	cmd.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	timeout.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	InstallerPeclient1.21.exe

Delays execution with timeout.exe 1 IoCs

evasion

Processes:

timeout.exe

pid	Process
1552	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
3200	schtasks.exe

Suspicious behavior: EnumeratesProcesses 19 IoCs

Processes:

AsyncClient.exe

pid	Process
3100	AsyncClient.exe
3100	AsyncClient.exe
3100	AsyncClient.exe
3100	AsyncClient.exe
3100	AsyncClient.exe
3100	AsyncClient.exe
3100	AsyncClient.exe
3100	AsyncClient.exe
3100	AsyncClient.exe
3100	AsyncClient.exe
3100	AsyncClient.exe
3100	AsyncClient.exe
3100	AsyncClient.exe
3100	AsyncClient.exe
3100	AsyncClient.exe
3100	AsyncClient.exe
3100	AsyncClient.exe
3100	AsyncClient.exe
3100	AsyncClient.exe

Suspicious use of AdjustPrivilegeToken 3 IoCs

Processes:

AsyncClient.exeInstallerPeclient1.21.exe

description	pid	Process
Token: SeDebugPrivilege	3100	AsyncClient.exe
Token: SeDebugPrivilege	904	InstallerPeclient1.21.exe
Token: SeDebugPrivilege	904	InstallerPeclient1.21.exe

Suspicious use of WriteProcessMemory 15 IoCs

Processes:

AsyncClient.execmd.execmd.exe

description	pid	Process	procid_target
PID 3100 wrote to memory of 4640	3100	AsyncClient.exe	81
PID 3100 wrote to memory of 4640	3100	AsyncClient.exe	81
PID 3100 wrote to memory of 4640	3100	AsyncClient.exe	81
PID 3100 wrote to memory of 2772	3100	AsyncClient.exe	83
PID 3100 wrote to memory of 2772	3100	AsyncClient.exe	83
PID 3100 wrote to memory of 2772	3100	AsyncClient.exe	83
PID 4640 wrote to memory of 3200	4640	cmd.exe	85
PID 4640 wrote to memory of 3200	4640	cmd.exe	85
PID 4640 wrote to memory of 3200	4640	cmd.exe	85
PID 2772 wrote to memory of 1552	2772	cmd.exe	86
PID 2772 wrote to memory of 1552	2772	cmd.exe	86
PID 2772 wrote to memory of 1552	2772	cmd.exe	86
PID 2772 wrote to memory of 904	2772	cmd.exe	87
PID 2772 wrote to memory of 904	2772	cmd.exe	87
PID 2772 wrote to memory of 904	2772	cmd.exe	87

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:3100
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /c schtasks /create /f /sc onlogon /rl highest /tn "InstallerPeclient1.21" /tr '"C:\Users\Admin\AppData\Roaming\InstallerPeclient1.21.exe"' & exit
  2⤵
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:4640
- - C:\Windows\SysWOW64\schtasks.exe
    schtasks /create /f /sc onlogon /rl highest /tn "InstallerPeclient1.21" /tr '"C:\Users\Admin\AppData\Roaming\InstallerPeclient1.21.exe"'
    3⤵
    - System Location Discovery: System Language Discovery
    - Scheduled Task/Job: Scheduled Task
    PID:3200
- C:\Windows\SysWOW64\cmd.exe
  C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\tmp366.tmp.bat""
  2⤵
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:2772
- - C:\Windows\SysWOW64\timeout.exe
    timeout 3
    3⤵
    - System Location Discovery: System Language Discovery
    - Delays execution with timeout.exe
    PID:1552
- - C:\Users\Admin\AppData\Roaming\InstallerPeclient1.21.exe
    "C:\Users\Admin\AppData\Roaming\InstallerPeclient1.21.exe"
    3⤵
    - Executes dropped EXE
    - System Location Discovery: System Language Discovery
    - Suspicious use of AdjustPrivilegeToken
    PID:904

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\tmp366.tmp.bat

Filesize
164B

MD5
8275d1edb1865da05da8675f6a53e179

SHA1
d1cee23be39c64d4cf95df1ca7db68471ba9d28b

SHA256
d6db7fc33b49cb42b270dfd77e5a946a87e5c2be0d8bc0997d631b9e4fc02b1f

SHA512
18458ca4f8e701acbf8dc8e0bde93123de40858b750f83c84ce4ddbfef720d9f206882d4a110d4d4086d5894fc50a11cd607fdbc02523354a79bc9358f2c8680

Download Submit
C:\Users\Admin\AppData\Roaming\InstallerPeclient1.21.exe

Filesize
48KB

MD5
a133aa15dff0878b51f78a73f26dcb75

SHA1
496da7070019ed5d6f0e113a2a456b6417f5fba8

SHA256
7d41f2fe756509c85b54522b30bc26bfedfaff42ead65e82d6de9c67c03a06d8

SHA512
9a7fef9d09697a71f8ce0e44a8bac041d8a7bec31a9c7c3bddc3efaecb0145a2ff96767e9ca19eca3384c6333263cf3ec55be125236a275bee7a857ccfce2fca

Download Submit
memory/904-16-0x0000000074BA0000-0x0000000075351000-memory.dmp

Filesize
7.7MB

Download
memory/904-17-0x0000000074BA0000-0x0000000075351000-memory.dmp

Filesize
7.7MB

Download
memory/3100-0-0x0000000074C5E000-0x0000000074C5F000-memory.dmp

Filesize
4KB

Download
memory/3100-1-0x0000000000C30000-0x0000000000C42000-memory.dmp

Filesize
72KB

Download
memory/3100-2-0x0000000074C5E000-0x0000000074C5F000-memory.dmp

Filesize
4KB

Download
memory/3100-3-0x0000000074C50000-0x0000000075401000-memory.dmp

Filesize
7.7MB

Download
memory/3100-4-0x0000000005690000-0x00000000056F6000-memory.dmp

Filesize
408KB

Download
memory/3100-5-0x0000000005BA0000-0x0000000005C3C000-memory.dmp

Filesize
624KB

Download
memory/3100-6-0x0000000005B00000-0x0000000005B40000-memory.dmp

Filesize
256KB

Download
memory/3100-11-0x0000000074C50000-0x0000000075401000-memory.dmp

Filesize
7.7MB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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