asyncrat | 98040733ac189b6a213b5ba69a758f205207beed0f0805ff99ea4566c50f6371

Analysis

max time kernel
149s
max time network
149s
platform
windows7_x64
resource
win7-20240729-en
resource tags

arch:x64arch:x86image:win7-20240729-enlocale:en-usos:windows7-x64system
submitted
05-01-2025 14:31

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General

Target

RuntimeBroker.exe
Size

48KB
MD5

d9a8b8d68e324839f69ece3a04575db8
SHA1

e62d94e7b067915645d8b6aed6222f90e44c5745
SHA256

98040733ac189b6a213b5ba69a758f205207beed0f0805ff99ea4566c50f6371
SHA512

4e5a0c660d2f0e2941c786c9f1490fef465c1ebf31ce4b76ffca659b1b22312b67632f76df5bf5f1717b46bf84949ded52506f337e8ff5c5806b8fc417743791
SSDEEP

768:Qu+01TQQEX1WUVt1Pmo2qjzzqLCLke9xWRfGtW0budjTPxk7lslvIroPRH4D6cD4:Qu+01TQfb2rLHeSRQ5buxxkhslvIwH4O

Score

10^/10

asyncrat default discovery rat

Malware Config

Extracted

Family

asyncrat

Version

0.5.8

Botnet

Default

win-five.gl.at.ply.gg:62867

Mutex

wSVzarUq9UtI

Attributes

delay
3
install
true
install_file
RuntimeBroker.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/0x00080000000120fd-13.dat	family_asyncrat

Executes dropped EXE 1 IoCs

pid	Process
2612	RuntimeBroker.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 10 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	schtasks.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	timeout.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	RuntimeBroker.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	timeout.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	RuntimeBroker.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	schtasks.exe

Delays execution with timeout.exe 2 IoCs

evasion

pid	Process
2460	timeout.exe
2264	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
2596	schtasks.exe

Suspicious behavior: EnumeratesProcesses 3 IoCs

pid	Process
3052	RuntimeBroker.exe
3052	RuntimeBroker.exe
3052	RuntimeBroker.exe

Suspicious use of AdjustPrivilegeToken 3 IoCs

description	pid	Process
Token: SeDebugPrivilege	3052	RuntimeBroker.exe
Token: SeDebugPrivilege	2612	RuntimeBroker.exe
Token: SeDebugPrivilege	2612	RuntimeBroker.exe

Suspicious use of WriteProcessMemory 36 IoCs

description	pid	Process	procid_target
PID 3052 wrote to memory of 2872	3052	RuntimeBroker.exe	31
PID 3052 wrote to memory of 2872	3052	RuntimeBroker.exe	31
PID 3052 wrote to memory of 2872	3052	RuntimeBroker.exe	31
PID 3052 wrote to memory of 2872	3052	RuntimeBroker.exe	31
PID 3052 wrote to memory of 2996	3052	RuntimeBroker.exe	33
PID 3052 wrote to memory of 2996	3052	RuntimeBroker.exe	33
PID 3052 wrote to memory of 2996	3052	RuntimeBroker.exe	33
PID 3052 wrote to memory of 2996	3052	RuntimeBroker.exe	33
PID 2872 wrote to memory of 2596	2872	cmd.exe	35
PID 2872 wrote to memory of 2596	2872	cmd.exe	35
PID 2872 wrote to memory of 2596	2872	cmd.exe	35
PID 2872 wrote to memory of 2596	2872	cmd.exe	35
PID 2996 wrote to memory of 2460	2996	cmd.exe	36
PID 2996 wrote to memory of 2460	2996	cmd.exe	36
PID 2996 wrote to memory of 2460	2996	cmd.exe	36
PID 2996 wrote to memory of 2460	2996	cmd.exe	36
PID 2996 wrote to memory of 2612	2996	cmd.exe	37
PID 2996 wrote to memory of 2612	2996	cmd.exe	37
PID 2996 wrote to memory of 2612	2996	cmd.exe	37
PID 2996 wrote to memory of 2612	2996	cmd.exe	37
PID 2612 wrote to memory of 1996	2612	RuntimeBroker.exe	40
PID 2612 wrote to memory of 1996	2612	RuntimeBroker.exe	40
PID 2612 wrote to memory of 1996	2612	RuntimeBroker.exe	40
PID 2612 wrote to memory of 1996	2612	RuntimeBroker.exe	40
PID 2612 wrote to memory of 1984	2612	RuntimeBroker.exe	41
PID 2612 wrote to memory of 1984	2612	RuntimeBroker.exe	41
PID 2612 wrote to memory of 1984	2612	RuntimeBroker.exe	41
PID 2612 wrote to memory of 1984	2612	RuntimeBroker.exe	41
PID 1984 wrote to memory of 2264	1984	cmd.exe	44
PID 1984 wrote to memory of 2264	1984	cmd.exe	44
PID 1984 wrote to memory of 2264	1984	cmd.exe	44
PID 1984 wrote to memory of 2264	1984	cmd.exe	44
PID 1996 wrote to memory of 2412	1996	cmd.exe	45
PID 1996 wrote to memory of 2412	1996	cmd.exe	45
PID 1996 wrote to memory of 2412	1996	cmd.exe	45
PID 1996 wrote to memory of 2412	1996	cmd.exe	45

C:\Users\Admin\AppData\Local\Temp\RuntimeBroker.exe
"C:\Users\Admin\AppData\Local\Temp\RuntimeBroker.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:3052
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /c schtasks /create /f /sc onlogon /rl highest /tn "RuntimeBroker" /tr '"C:\Users\Admin\AppData\Roaming\RuntimeBroker.exe"' & exit
  2⤵
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:2872
- - C:\Windows\SysWOW64\schtasks.exe
    schtasks /create /f /sc onlogon /rl highest /tn "RuntimeBroker" /tr '"C:\Users\Admin\AppData\Roaming\RuntimeBroker.exe"'
    3⤵
    - System Location Discovery: System Language Discovery
    - Scheduled Task/Job: Scheduled Task
    PID:2596
- C:\Windows\SysWOW64\cmd.exe
  cmd /c ""C:\Users\Admin\AppData\Local\Temp\tmp3591.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:2460
- - C:\Users\Admin\AppData\Roaming\RuntimeBroker.exe
    "C:\Users\Admin\AppData\Roaming\RuntimeBroker.exe"
    3⤵
    - Executes dropped EXE
    - System Location Discovery: System Language Discovery
    - Suspicious use of AdjustPrivilegeToken
    - Suspicious use of WriteProcessMemory
    PID:2612
  - - C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /c schtasks /delete /f /tn "RuntimeBroker"
      4⤵
      System Location Discovery: System Language Discovery
      Suspicious use of WriteProcessMemory
      PID:1996
    - - C:\Windows\SysWOW64\schtasks.exe
        
        schtasks /delete /f /tn "RuntimeBroker"
        5⤵
        System Location Discovery: System Language Discovery
        
        PID:2412
  - - C:\Windows\SysWOW64\cmd.exe
      cmd /c ""C:\Users\Admin\AppData\Local\Temp\tmp6BA7.tmp.bat""
      4⤵
      System Location Discovery: System Language Discovery
      Suspicious use of WriteProcessMemory
      PID:1984
    - - C:\Windows\SysWOW64\timeout.exe
        
        timeout 3
        5⤵
        System Location Discovery: System Language Discovery
        Delays execution with timeout.exe
        
        PID:2264

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

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\Cab394B.tmp

Filesize
70KB

MD5
49aebf8cbd62d92ac215b2923fb1b9f5

SHA1
1723be06719828dda65ad804298d0431f6aff976

SHA256
b33efcb95235b98b48508e019afa4b7655e80cf071defabd8b2123fc8b29307f

SHA512
bf86116b015fb56709516d686e168e7c9c68365136231cc51d0b6542ae95323a71d2c7acec84aad7dcecc2e410843f6d82a0a6d51b9acfc721a9c84fdd877b5b

Download Submit
C:\Users\Admin\AppData\Local\Temp\Tar6B27.tmp

Filesize
181KB

MD5
4ea6026cf93ec6338144661bf1202cd1

SHA1
a1dec9044f750ad887935a01430bf49322fbdcb7

SHA256
8efbc21559ef8b1bcf526800d8070baad42474ce7198e26fa771dbb41a76b1d8

SHA512
6c7e0980e39aacf4c3689802353f464a08cd17753bd210ee997e5f2a455deb4f287a9ef74d84579dbde49bc96213cd2b8b247723919c412ea980aa6e6bfe218b

Download Submit
C:\Users\Admin\AppData\Local\Temp\tmp3591.tmp.bat

Filesize
157B

MD5
648f1c6e37d838b8fc86544180493417

SHA1
78db99a07365c4b2aa0c3620b16f657f76bf9434

SHA256
492d0757d4a5ac85eaf38039faa5dbf008bf58c8e6084e134a8bfcd29430c809

SHA512
eb753ef8e20153d4143976d505d8ff99f2f91d3722e2714bc12e7ba0a1369a93690953711cb79199bd684a5c21286e5ff13644446845a5fa1f00f8c3e1d62ff0

Download Submit
C:\Users\Admin\AppData\Local\Temp\tmp6BA7.tmp.bat

Filesize
162B

MD5
51ad2f44013ddc1ddb5699791acd98c9

SHA1
44fea0dadfc31c09e6775092f53c08620a34aecc

SHA256
f187c017814f265785b261dcc9ba3af55ed08213e99521b15da547e33ab05945

SHA512
b75fea0b73625c49b0bdae84297b82cc37d0b33dfc337dc5fecb80708b82159a81e23f6d6e9bf9da95076637c8590866c04db865dd1ed6c294066efd87aab933

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

Filesize
48KB

MD5
d9a8b8d68e324839f69ece3a04575db8

SHA1
e62d94e7b067915645d8b6aed6222f90e44c5745

SHA256
98040733ac189b6a213b5ba69a758f205207beed0f0805ff99ea4566c50f6371

SHA512
4e5a0c660d2f0e2941c786c9f1490fef465c1ebf31ce4b76ffca659b1b22312b67632f76df5bf5f1717b46bf84949ded52506f337e8ff5c5806b8fc417743791

Download Submit
memory/2612-16-0x0000000000A10000-0x0000000000A22000-memory.dmp

Filesize
72KB

Download
memory/2612-34-0x0000000000690000-0x000000000069E000-memory.dmp

Filesize
56KB

Download
memory/3052-0-0x0000000073F5E000-0x0000000073F5F000-memory.dmp

Filesize
4KB

Download
memory/3052-1-0x0000000000A40000-0x0000000000A52000-memory.dmp

Filesize
72KB

Download
memory/3052-2-0x0000000073F50000-0x000000007463E000-memory.dmp

Filesize
6.9MB

Download
memory/3052-11-0x0000000073F50000-0x000000007463E000-memory.dmp

Filesize
6.9MB

Download