asyncrat | e0f9ca55f06233cd4e2a7e4cf77fb678a9cff34b548c85ea7c2cdf7ede07270c

Analysis

max time kernel
91s
max time network
89s
platform
windows7_x64
resource
win7-20240729-en
resource tags

arch:x64arch:x86image:win7-20240729-enlocale:en-usos:windows7-x64system
submitted
25-11-2024 03:22

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General

Target

AsyncClient1.exe
Size

47KB
MD5

f65631d6798eaa350884e4f996f7f6a9
SHA1

a913ae3757728dc296bc1076147eb840e887d8fc
SHA256

e0f9ca55f06233cd4e2a7e4cf77fb678a9cff34b548c85ea7c2cdf7ede07270c
SHA512

e0c73a639c5236a9cb1800732c736c3a3071e50660495517e43b55b815eb99d0faf74f04e3de79e9fa112b6a09721d178f3b3929585fbfdb5bee2cda95b6bd0e
SSDEEP

768:xuyxNTAoZjRWUJd9bmo2qL5+Cr96UGMRPIom7e7PesJ0bFm3sJsynjSY1zeBDZMx:xuyxNTAGL2xuCMOom7ebRubFm3kZlMdO

Score

10^/10

asyncrat default discovery rat

Malware Config

Extracted

Family

asyncrat

Version

0.5.8

Botnet

Default

between-reprint.gl.at.ply.gg:5942

Mutex

CKnrCmvLB4KG

Attributes

delay
3
install
true
install_file
Windows.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/0x00090000000122cf-13.dat	family_asyncrat

Executes dropped EXE 1 IoCs

Processes:

Windows.exe

pid	Process
3044	Windows.exe

Loads dropped DLL 1 IoCs

Processes:

cmd.exe

pid	Process
2556	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

Processes:

cmd.exeschtasks.exetimeout.execmd.exeschtasks.exeAsyncClient1.execmd.exeWindows.execmd.exetimeout.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	cmd.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	schtasks.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	AsyncClient1.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	cmd.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	Windows.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	cmd.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	timeout.exe

Delays execution with timeout.exe 2 IoCs

evasion

Processes:

timeout.exetimeout.exe

pid	Process
2528	timeout.exe
1464	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
2640	schtasks.exe

Suspicious behavior: EnumeratesProcesses 3 IoCs

Processes:

AsyncClient1.exe

pid	Process
1900	AsyncClient1.exe
1900	AsyncClient1.exe
1900	AsyncClient1.exe

Suspicious use of AdjustPrivilegeToken 3 IoCs

Processes:

AsyncClient1.exeWindows.exe

description	pid	Process
Token: SeDebugPrivilege	1900	AsyncClient1.exe
Token: SeDebugPrivilege	3044	Windows.exe
Token: SeDebugPrivilege	3044	Windows.exe

Suspicious use of WriteProcessMemory 36 IoCs

Processes:

AsyncClient1.execmd.execmd.exeWindows.execmd.execmd.exe

description	pid	Process	procid_target
PID 1900 wrote to memory of 2644	1900	AsyncClient1.exe	31
PID 1900 wrote to memory of 2644	1900	AsyncClient1.exe	31
PID 1900 wrote to memory of 2644	1900	AsyncClient1.exe	31
PID 1900 wrote to memory of 2644	1900	AsyncClient1.exe	31
PID 1900 wrote to memory of 2556	1900	AsyncClient1.exe	33
PID 1900 wrote to memory of 2556	1900	AsyncClient1.exe	33
PID 1900 wrote to memory of 2556	1900	AsyncClient1.exe	33
PID 1900 wrote to memory of 2556	1900	AsyncClient1.exe	33
PID 2644 wrote to memory of 2640	2644	cmd.exe	35
PID 2644 wrote to memory of 2640	2644	cmd.exe	35
PID 2644 wrote to memory of 2640	2644	cmd.exe	35
PID 2644 wrote to memory of 2640	2644	cmd.exe	35
PID 2556 wrote to memory of 2528	2556	cmd.exe	36
PID 2556 wrote to memory of 2528	2556	cmd.exe	36
PID 2556 wrote to memory of 2528	2556	cmd.exe	36
PID 2556 wrote to memory of 2528	2556	cmd.exe	36
PID 2556 wrote to memory of 3044	2556	cmd.exe	37
PID 2556 wrote to memory of 3044	2556	cmd.exe	37
PID 2556 wrote to memory of 3044	2556	cmd.exe	37
PID 2556 wrote to memory of 3044	2556	cmd.exe	37
PID 3044 wrote to memory of 1904	3044	Windows.exe	38
PID 3044 wrote to memory of 1904	3044	Windows.exe	38
PID 3044 wrote to memory of 1904	3044	Windows.exe	38
PID 3044 wrote to memory of 1904	3044	Windows.exe	38
PID 3044 wrote to memory of 2448	3044	Windows.exe	40
PID 3044 wrote to memory of 2448	3044	Windows.exe	40
PID 3044 wrote to memory of 2448	3044	Windows.exe	40
PID 3044 wrote to memory of 2448	3044	Windows.exe	40
PID 1904 wrote to memory of 2396	1904	cmd.exe	42
PID 1904 wrote to memory of 2396	1904	cmd.exe	42
PID 1904 wrote to memory of 2396	1904	cmd.exe	42
PID 1904 wrote to memory of 2396	1904	cmd.exe	42
PID 2448 wrote to memory of 1464	2448	cmd.exe	43
PID 2448 wrote to memory of 1464	2448	cmd.exe	43
PID 2448 wrote to memory of 1464	2448	cmd.exe	43
PID 2448 wrote to memory of 1464	2448	cmd.exe	43

C:\Users\Admin\AppData\Local\Temp\AsyncClient1.exe
"C:\Users\Admin\AppData\Local\Temp\AsyncClient1.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:1900
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /c schtasks /create /f /sc onlogon /rl highest /tn "Windows" /tr '"C:\Users\Admin\AppData\Roaming\Windows.exe"' & exit
  2⤵
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:2644
- - C:\Windows\SysWOW64\schtasks.exe
    schtasks /create /f /sc onlogon /rl highest /tn "Windows" /tr '"C:\Users\Admin\AppData\Roaming\Windows.exe"'
    3⤵
    - System Location Discovery: System Language Discovery
    - Scheduled Task/Job: Scheduled Task
    PID:2640
- C:\Windows\SysWOW64\cmd.exe
  cmd /c ""C:\Users\Admin\AppData\Local\Temp\tmp65B5.tmp.bat""
  2⤵
  - Loads dropped DLL
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:2556
- - C:\Windows\SysWOW64\timeout.exe
    timeout 3
    3⤵
    - System Location Discovery: System Language Discovery
    - Delays execution with timeout.exe
    PID:2528
- - C:\Users\Admin\AppData\Roaming\Windows.exe
    "C:\Users\Admin\AppData\Roaming\Windows.exe"
    3⤵
    - Executes dropped EXE
    - System Location Discovery: System Language Discovery
    - Suspicious use of AdjustPrivilegeToken
    - Suspicious use of WriteProcessMemory
    PID:3044
  - - C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /c schtasks /delete /f /tn "Windows"
      4⤵
      System Location Discovery: System Language Discovery
      Suspicious use of WriteProcessMemory
      PID:1904
    - - C:\Windows\SysWOW64\schtasks.exe
        
        schtasks /delete /f /tn "Windows"
        5⤵
        System Location Discovery: System Language Discovery
        
        PID:2396
  - - C:\Windows\SysWOW64\cmd.exe
      cmd /c ""C:\Users\Admin\AppData\Local\Temp\tmpA0BA.tmp.bat""
      4⤵
      System Location Discovery: System Language Discovery
      Suspicious use of WriteProcessMemory
      PID:2448
    - - C:\Windows\SysWOW64\timeout.exe
        
        timeout 3
        5⤵
        System Location Discovery: System Language Discovery
        Delays execution with timeout.exe
        
        PID:1464

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\Cab83B3.tmp

Filesize
70KB

MD5
49aebf8cbd62d92ac215b2923fb1b9f5

SHA1
1723be06719828dda65ad804298d0431f6aff976

SHA256
b33efcb95235b98b48508e019afa4b7655e80cf071defabd8b2123fc8b29307f

SHA512
bf86116b015fb56709516d686e168e7c9c68365136231cc51d0b6542ae95323a71d2c7acec84aad7dcecc2e410843f6d82a0a6d51b9acfc721a9c84fdd877b5b

Download Submit
C:\Users\Admin\AppData\Local\Temp\Tar9F8F.tmp

Filesize
181KB

MD5
4ea6026cf93ec6338144661bf1202cd1

SHA1
a1dec9044f750ad887935a01430bf49322fbdcb7

SHA256
8efbc21559ef8b1bcf526800d8070baad42474ce7198e26fa771dbb41a76b1d8

SHA512
6c7e0980e39aacf4c3689802353f464a08cd17753bd210ee997e5f2a455deb4f287a9ef74d84579dbde49bc96213cd2b8b247723919c412ea980aa6e6bfe218b

Download Submit
C:\Users\Admin\AppData\Local\Temp\tmp65B5.tmp.bat

Filesize
151B

MD5
008d471eba5d0e2b2c893280a6f1a83b

SHA1
18c1da74359546bb1e56898fed575e30def623ae

SHA256
7802768d8341fa3727d283944c3d39b244e5e4b64f83e8844feb83a279413899

SHA512
0f6a1ecb9a288e00fae5f1a50c0069d99bfc8054fa6d9ec23601c1a19dcfdb03a8f8955808e91a5ba530e7ff78e9f8cf39d415ee59a8b1f2b34999e326e98595

Download Submit
C:\Users\Admin\AppData\Local\Temp\tmpA0BA.tmp.bat

Filesize
156B

MD5
8b53daff467a0ae81f2c24966168c89f

SHA1
90c572a622541575981647ed87deba5ca62868b5

SHA256
34b4b5842987c552aad1a4dcb650b7ce7f1911ec73886aade2cd7f278d646dfc

SHA512
801e0360e126d330ad4978c96af90b70736ebbc70e9bc68b64841a62a762067c6cbd5e9836727b6c014eb0a980fcf7a8559c28dd332df8ceafdf65ef95e5012d

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

Filesize
47KB

MD5
f65631d6798eaa350884e4f996f7f6a9

SHA1
a913ae3757728dc296bc1076147eb840e887d8fc

SHA256
e0f9ca55f06233cd4e2a7e4cf77fb678a9cff34b548c85ea7c2cdf7ede07270c

SHA512
e0c73a639c5236a9cb1800732c736c3a3071e50660495517e43b55b815eb99d0faf74f04e3de79e9fa112b6a09721d178f3b3929585fbfdb5bee2cda95b6bd0e

Download Submit
memory/1900-0-0x000000007421E000-0x000000007421F000-memory.dmp

Filesize
4KB

Download
memory/1900-1-0x00000000013C0000-0x00000000013D2000-memory.dmp

Filesize
72KB

Download
memory/1900-2-0x0000000074210000-0x00000000748FE000-memory.dmp

Filesize
6.9MB

Download
memory/1900-11-0x0000000074210000-0x00000000748FE000-memory.dmp

Filesize
6.9MB

Download
memory/3044-16-0x0000000000190000-0x00000000001A2000-memory.dmp

Filesize
72KB

Download
memory/3044-34-0x0000000004640000-0x00000000046A4000-memory.dmp

Filesize
400KB

Download