asyncrat | 7c5ee2fc7c492cd69def5c240eec4fd5661fba35a3bf2c45f6a9d3674ac7b53a

Analysis

max time kernel
144s
max time network
147s
platform
windows10-2004_x64
resource
win10v2004-20230703-en
resource tags

arch:x64arch:x86image:win10v2004-20230703-enlocale:en-usos:windows10-2004-x64system
submitted
04/08/2023, 21:00

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General

Target
AsyncClient.exe
Size 47KB
Sample230804-ztsy6sed28
SHA256 7c5ee2fc7c492cd69def5c240eec4fd5661fba35a3bf2c45f6a9d3674ac7b53a
MD5 670773fa127efb9d6df9bea8f7ddeb18
SHA1 4eca7d593cbd991e6ae3f487a1c9fe6656bf1356
SHA512 b931620edcde886977711b6695fca3b4709cc1032e9c4814684bb6f85f0a0f4ba20f0bf21992a46b3b1fba6f6c88dd239c244952cf928453842a174501608321
SSDEEP 768:6uSQNT3ol7xWUpe+7mo2qLSL1aZVePI47I0rI0bj2ax/Y3Q5F5HNBDZcx:6uSQNT3K52DL1qZ47IObjz/iQrldcx
MD5 SHA1 SHA512 SSDEEP

Score

10^/10

asyncrat default rat

Malware Config

Extracted

Family

asyncrat

Version

0.5.7B

Botnet

Default

127.0.0.1:6606
127.0.0.1:7707
127.0.0.1:8808

Mutex

AsyncMutex_6SI8OkPnk

Attributes

delay
3
install
true
install_file
Celestial-Microsoft-Fix.exe
install_folder
%AppData%

aes.plain

Signatures

AsyncRat
AsyncRAT is designed to remotely monitor and control other computers written in C#.
rat asyncrat

Async RAT payload 3 IoCs

rat

resource	yara_rule
behavioral2/memory/5012-133-0x0000000000760000-0x0000000000772000-memory.dmp	asyncrat
behavioral2/files/0x00080000000230ef-145.dat	asyncrat
behavioral2/files/0x00080000000230ef-146.dat	asyncrat

Executes dropped EXE 1 IoCs

pid	Process
912	Celestial-Microsoft-Fix.exe

Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).

System Information Discovery
T1082

Creates scheduled task(s) 1 TTPs 1 IoCs

Schtasks is often used by malware for persistence or to perform post-infection execution.

persistence

Scheduled Task/Job

T1053

pid	Process
2116	schtasks.exe

Delays execution with timeout.exe 1 IoCs

evasion

pid	Process
2176	timeout.exe

Suspicious behavior: EnumeratesProcesses 23 IoCs

pid	Process
5012	AsyncClient.exe
5012	AsyncClient.exe
5012	AsyncClient.exe
5012	AsyncClient.exe
5012	AsyncClient.exe
5012	AsyncClient.exe
5012	AsyncClient.exe
5012	AsyncClient.exe
5012	AsyncClient.exe
5012	AsyncClient.exe
5012	AsyncClient.exe
5012	AsyncClient.exe
5012	AsyncClient.exe
5012	AsyncClient.exe
5012	AsyncClient.exe
5012	AsyncClient.exe
5012	AsyncClient.exe
5012	AsyncClient.exe
5012	AsyncClient.exe
5012	AsyncClient.exe
5012	AsyncClient.exe
5012	AsyncClient.exe
5012	AsyncClient.exe

Suspicious use of AdjustPrivilegeToken 3 IoCs

description	pid	Process
Token: SeDebugPrivilege	5012	AsyncClient.exe
Token: SeDebugPrivilege	912	Celestial-Microsoft-Fix.exe
Token: SeDebugPrivilege	912	Celestial-Microsoft-Fix.exe

Suspicious use of WriteProcessMemory 15 IoCs

description	pid	Process	procid_target
PID 5012 wrote to memory of 4868	5012	AsyncClient.exe	93
PID 5012 wrote to memory of 4868	5012	AsyncClient.exe	93
PID 5012 wrote to memory of 4868	5012	AsyncClient.exe	93
PID 5012 wrote to memory of 2436	5012	AsyncClient.exe	94
PID 5012 wrote to memory of 2436	5012	AsyncClient.exe	94
PID 5012 wrote to memory of 2436	5012	AsyncClient.exe	94
PID 4868 wrote to memory of 2116	4868	cmd.exe	97
PID 4868 wrote to memory of 2116	4868	cmd.exe	97
PID 4868 wrote to memory of 2116	4868	cmd.exe	97
PID 2436 wrote to memory of 2176	2436	cmd.exe	98
PID 2436 wrote to memory of 2176	2436	cmd.exe	98
PID 2436 wrote to memory of 2176	2436	cmd.exe	98
PID 2436 wrote to memory of 912	2436	cmd.exe	102
PID 2436 wrote to memory of 912	2436	cmd.exe	102
PID 2436 wrote to memory of 912	2436	cmd.exe	102

C:\Users\Admin\AppData\Local\Temp\AsyncClient.exe
"C:\Users\Admin\AppData\Local\Temp\AsyncClient.exe"
1⤵
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:5012
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /c schtasks /create /f /sc onlogon /rl highest /tn "Celestial-Microsoft-Fix" /tr '"C:\Users\Admin\AppData\Roaming\Celestial-Microsoft-Fix.exe"' & exit
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:4868
- - C:\Windows\SysWOW64\schtasks.exe
    schtasks /create /f /sc onlogon /rl highest /tn "Celestial-Microsoft-Fix" /tr '"C:\Users\Admin\AppData\Roaming\Celestial-Microsoft-Fix.exe"'
    3⤵
    - Creates scheduled task(s)
    PID:2116
- C:\Windows\SysWOW64\cmd.exe
  C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\tmpCBCC.tmp.bat""
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:2436
- - C:\Windows\SysWOW64\timeout.exe
    timeout 3
    3⤵
    - Delays execution with timeout.exe
    PID:2176
- - C:\Users\Admin\AppData\Roaming\Celestial-Microsoft-Fix.exe
    "C:\Users\Admin\AppData\Roaming\Celestial-Microsoft-Fix.exe"
    3⤵
    - Executes dropped EXE
    - Suspicious use of AdjustPrivilegeToken
    PID:912

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Scheduled Task/Job

T1053

Persistence

Scheduled Task/Job

T1053

Privilege Escalation

Scheduled Task/Job

T1053

Defense Evasion

Credential Access

Discovery

System Information Discovery

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

tmpCBCC.tmp.bat

Path C:\Users\Admin\AppData\Local\Temp\tmpCBCC.tmp.bat
Size 167B
SHA256 6df21edbc64b665ad38c8f6d2d6e0c72a50b535482283329d3fb1e8d27e22db2
MD5 ca727139510c2b2fa579842d430daec4
SHA1 f6bb7039ddce7337cffe64f3fb191c93ed93c891
SHA512 4fba2f6bdd4fbc328c2e0ce3c20089d21f5bd34562f7b17a58adec79607af4fa441d555a0063ce60c82fafbc12e7a92706d375207dec4abbe863b1c67ecd7f90
MD5 SHA1 SHA512

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Celestial-Microsoft-Fix.exe

Path C:\Users\Admin\AppData\Roaming\Celestial-Microsoft-Fix.exe
Size 47KB
SHA256 7c5ee2fc7c492cd69def5c240eec4fd5661fba35a3bf2c45f6a9d3674ac7b53a
MD5 670773fa127efb9d6df9bea8f7ddeb18
SHA1 4eca7d593cbd991e6ae3f487a1c9fe6656bf1356
SHA512 b931620edcde886977711b6695fca3b4709cc1032e9c4814684bb6f85f0a0f4ba20f0bf21992a46b3b1fba6f6c88dd239c244952cf928453842a174501608321
SSDEEP 768:6uSQNT3ol7xWUpe+7mo2qLSL1aZVePI47I0rI0bj2ax/Y3Q5F5HNBDZcx:6uSQNT3K52DL1qZ47IObjz/iQrldcx
MD5 SHA1 SHA512 SSDEEP

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Celestial-Microsoft-Fix.exe

Path C:\Users\Admin\AppData\Roaming\Celestial-Microsoft-Fix.exe
Size 47KB
SHA256 7c5ee2fc7c492cd69def5c240eec4fd5661fba35a3bf2c45f6a9d3674ac7b53a
MD5 670773fa127efb9d6df9bea8f7ddeb18
SHA1 4eca7d593cbd991e6ae3f487a1c9fe6656bf1356
SHA512 b931620edcde886977711b6695fca3b4709cc1032e9c4814684bb6f85f0a0f4ba20f0bf21992a46b3b1fba6f6c88dd239c244952cf928453842a174501608321
SSDEEP 768:6uSQNT3ol7xWUpe+7mo2qLSL1aZVePI47I0rI0bj2ax/Y3Q5F5HNBDZcx:6uSQNT3K52DL1qZ47IObjz/iQrldcx
MD5 SHA1 SHA512 SSDEEP

Submit Download

memory/912-147-0x0000000074AE0000-0x0000000075290000-memory.dmp

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memory/912-148-0x00000000056A0000-0x00000000056B0000-memory.dmp

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memory/912-149-0x0000000074AE0000-0x0000000075290000-memory.dmp

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memory/912-150-0x00000000056A0000-0x00000000056B0000-memory.dmp

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memory/5012-137-0x0000000005650000-0x00000000056EC000-memory.dmp

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memory/5012-142-0x0000000074B90000-0x0000000075340000-memory.dmp

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memory/5012-136-0x00000000051F0000-0x0000000005256000-memory.dmp

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memory/5012-135-0x00000000051E0000-0x00000000051F0000-memory.dmp

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memory/5012-134-0x0000000074B90000-0x0000000075340000-memory.dmp

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memory/5012-133-0x0000000000760000-0x0000000000772000-memory.dmp

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