Analysis

  • max time kernel
    92s
  • max time network
    147s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20240412-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20240412-enlocale:en-usos:windows10-2004-x64system
  • submitted
    16-04-2024 21:53

General

  • Target

    assssss.exe

  • Size

    74KB

  • MD5

    00633c71d9fa6e703dacc8c6266b2613

  • SHA1

    c673396470a64a46c5c96643aa7558a35722faf2

  • SHA256

    cef1b063659f6f90cb4a3d0dc14295919ea7c11020918d9c3a01a7705dd2e175

  • SHA512

    840a93b7d5e992176f672618b8f4f23f0e697093656914525229555970dd91c19ceec1996d6d00d5ca372b029e944164d73d36d19994ad5c435618b6efa8f0cf

  • SSDEEP

    1536:eUYccx0dxCKg6PMV1QKI/H1bz/uVSjhaQzcaLVclN:eUlcx0f9g6PMV1QzH1bzW6haQLBY

Malware Config

Extracted

Family

asyncrat

Version

Venom RAT + HVNC + Stealer + Grabber v6.0.3

Botnet

Default

C2

66.66.146.74:9511

Mutex

kvudvdwyjbukkqcnuoq

Attributes
  • delay

    1

  • install

    true

  • install_file

    Windows Host.exe

  • install_folder

    %Temp%

aes.plain

Signatures

  • AsyncRat

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

  • Async RAT payload 1 IoCs
  • Checks computer location settings 2 TTPs 1 IoCs

    Looks up country code configured in the registry, likely geofence.

  • Executes dropped EXE 1 IoCs
  • Checks installed software on the system 1 TTPs

    Looks up Uninstall key entries in the registry to enumerate software on the system.

  • Enumerates physical storage devices 1 TTPs

    Attempts to interact with connected storage/optical drive(s).

  • Creates scheduled task(s) 1 TTPs 1 IoCs

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

  • Delays execution with timeout.exe 1 IoCs
  • Suspicious behavior: EnumeratesProcesses 24 IoCs
  • Suspicious use of AdjustPrivilegeToken 2 IoCs
  • Suspicious use of SetWindowsHookEx 1 IoCs
  • Suspicious use of WriteProcessMemory 10 IoCs
  • Uses Task Scheduler COM API 1 TTPs

    The Task Scheduler COM API can be used to schedule applications to run on boot or at set times.

Processes

  • C:\Users\Admin\AppData\Local\Temp\assssss.exe
    "C:\Users\Admin\AppData\Local\Temp\assssss.exe"
    1⤵
    • Checks computer location settings
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:3280
    • C:\Windows\System32\cmd.exe
      "C:\Windows\System32\cmd.exe" /c schtasks /create /f /sc onlogon /rl highest /tn "Windows Host" /tr '"C:\Users\Admin\AppData\Local\Temp\Windows Host.exe"' & exit
      2⤵
      • Suspicious use of WriteProcessMemory
      PID:5116
      • C:\Windows\system32\schtasks.exe
        schtasks /create /f /sc onlogon /rl highest /tn "Windows Host" /tr '"C:\Users\Admin\AppData\Local\Temp\Windows Host.exe"'
        3⤵
        • Creates scheduled task(s)
        PID:4304
    • C:\Windows\system32\cmd.exe
      C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\tmp7772.tmp.bat""
      2⤵
      • Suspicious use of WriteProcessMemory
      PID:1664
      • C:\Windows\system32\timeout.exe
        timeout 3
        3⤵
        • Delays execution with timeout.exe
        PID:4080
      • C:\Users\Admin\AppData\Local\Temp\Windows Host.exe
        "C:\Users\Admin\AppData\Local\Temp\Windows Host.exe"
        3⤵
        • Executes dropped EXE
        • Suspicious behavior: EnumeratesProcesses
        • Suspicious use of AdjustPrivilegeToken
        • Suspicious use of SetWindowsHookEx
        PID:4004

Network

MITRE ATT&CK Enterprise v15

Replay Monitor

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Downloads

  • C:\Users\Admin\AppData\Local\Temp\Windows Host.exe

    Filesize

    74KB

    MD5

    00633c71d9fa6e703dacc8c6266b2613

    SHA1

    c673396470a64a46c5c96643aa7558a35722faf2

    SHA256

    cef1b063659f6f90cb4a3d0dc14295919ea7c11020918d9c3a01a7705dd2e175

    SHA512

    840a93b7d5e992176f672618b8f4f23f0e697093656914525229555970dd91c19ceec1996d6d00d5ca372b029e944164d73d36d19994ad5c435618b6efa8f0cf

  • C:\Users\Admin\AppData\Local\Temp\tmp7772.tmp.bat

    Filesize

    159B

    MD5

    f71ae9567260e80de0d74b8563eba396

    SHA1

    c82f906b4ef422c1f0554902e8e7361d5bcdc8c6

    SHA256

    0c3c009d16f91af265fed09f9a36c4c8087003fae69573809f8941eafc1c6977

    SHA512

    d5346ffb7d97f941a8b46ab7e3eae3ba8e0910bb27138209ae97e33174780fc49e63d386cba55dd7d0f9b23b172cce1ce081e78602ec04def037612af9f99a6e

  • C:\Users\Admin\AppData\Roaming\MyData\DataLogs.conf

    Filesize

    8B

    MD5

    cf759e4c5f14fe3eec41b87ed756cea8

    SHA1

    c27c796bb3c2fac929359563676f4ba1ffada1f5

    SHA256

    c9f9f193409217f73cc976ad078c6f8bf65d3aabcf5fad3e5a47536d47aa6761

    SHA512

    c7f832aee13a5eb36d145f35d4464374a9e12fa2017f3c2257442d67483b35a55eccae7f7729243350125b37033e075efbc2303839fd86b81b9b4dca3626953b

  • memory/3280-9-0x00007FFCD1C30000-0x00007FFCD26F1000-memory.dmp

    Filesize

    10.8MB

  • memory/3280-0-0x0000000000960000-0x0000000000978000-memory.dmp

    Filesize

    96KB

  • memory/3280-10-0x00007FFCF0010000-0x00007FFCF0205000-memory.dmp

    Filesize

    2.0MB

  • memory/3280-8-0x00007FFCF0010000-0x00007FFCF0205000-memory.dmp

    Filesize

    2.0MB

  • memory/3280-3-0x000000001B6D0000-0x000000001B6E0000-memory.dmp

    Filesize

    64KB

  • memory/3280-1-0x00007FFCD1C30000-0x00007FFCD26F1000-memory.dmp

    Filesize

    10.8MB

  • memory/4004-17-0x000000001B530000-0x000000001B540000-memory.dmp

    Filesize

    64KB

  • memory/4004-16-0x00007FFCD1C30000-0x00007FFCD26F1000-memory.dmp

    Filesize

    10.8MB

  • memory/4004-18-0x000000001B530000-0x000000001B540000-memory.dmp

    Filesize

    64KB

  • memory/4004-19-0x000000001B530000-0x000000001B540000-memory.dmp

    Filesize

    64KB

  • memory/4004-20-0x00007FFCD1C30000-0x00007FFCD26F1000-memory.dmp

    Filesize

    10.8MB

  • memory/4004-21-0x000000001B530000-0x000000001B540000-memory.dmp

    Filesize

    64KB

  • memory/4004-22-0x000000001B530000-0x000000001B540000-memory.dmp

    Filesize

    64KB

  • memory/4004-23-0x000000001B530000-0x000000001B540000-memory.dmp

    Filesize

    64KB