Analysis

  • max time kernel
    147s
  • max time network
    151s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20240508-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20240508-enlocale:en-usos:windows10-2004-x64system
  • submitted
    29-06-2024 11:27

General

  • Target

    normal.exe

  • Size

    45KB

  • MD5

    24de871a8fa5bc8a878ae2b76ccf7081

  • SHA1

    c31b38ed40a3e89d2c156851740cf50c6b42441e

  • SHA256

    659a6386bb99408c651bbadc023de111e967f887c92e66f83d38208f8eee3afc

  • SHA512

    9bfad714aa138a4de3c568540ae07ea65c57f4230748d74561a18dc125de1e47bb1fa27c4fb30b1d52d554e240c48435e60d2c46989453fffa8fe1930195e859

  • SSDEEP

    768:yu1a71T3EiJfWUzDydmo2qzh58SIkOPILzjb5gs3i+uROUHVnloBDZ7x:yu1a71T3xq2sNF3L3bWsS+yHVlOd7x

Score
10/10

Malware Config

Extracted

Family

asyncrat

Version

0.5.8

Botnet

Default

Mutex

dzacwFnyvZFC

Attributes
  • delay

    3

  • install

    true

  • install_file

    update.exe

  • install_folder

    %AppData%

  • pastebin_config

    https://pastebin.com/raw/K16mDJV5

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
  • Legitimate hosting services abused for malware hosting/C2 1 TTPs 8 IoCs
  • Enumerates physical storage devices 1 TTPs

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

  • Delays execution with timeout.exe 1 IoCs
  • Scheduled Task/Job: Scheduled Task 1 TTPs 1 IoCs

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

  • Suspicious behavior: EnumeratesProcesses 21 IoCs
  • Suspicious use of AdjustPrivilegeToken 2 IoCs
  • Suspicious use of WriteProcessMemory 15 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\normal.exe
    "C:\Users\Admin\AppData\Local\Temp\normal.exe"
    1⤵
    • Checks computer location settings
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:4816
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /c schtasks /create /f /sc onlogon /rl highest /tn "update" /tr '"C:\Users\Admin\AppData\Roaming\update.exe"' & exit
      2⤵
      • Suspicious use of WriteProcessMemory
      PID:4460
      • C:\Windows\SysWOW64\schtasks.exe
        schtasks /create /f /sc onlogon /rl highest /tn "update" /tr '"C:\Users\Admin\AppData\Roaming\update.exe"'
        3⤵
        • Scheduled Task/Job: Scheduled Task
        PID:2936
    • C:\Windows\SysWOW64\cmd.exe
      C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\tmp5B7E.tmp.bat""
      2⤵
      • Suspicious use of WriteProcessMemory
      PID:824
      • C:\Windows\SysWOW64\timeout.exe
        timeout 3
        3⤵
        • Delays execution with timeout.exe
        PID:2136
      • C:\Users\Admin\AppData\Roaming\update.exe
        "C:\Users\Admin\AppData\Roaming\update.exe"
        3⤵
        • Executes dropped EXE
        • Suspicious use of AdjustPrivilegeToken
        PID:2564

Network

MITRE ATT&CK Enterprise v15

Replay Monitor

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Downloads

  • C:\Users\Admin\AppData\Local\Temp\tmp5B7E.tmp.bat

    Filesize

    150B

    MD5

    a9e561303ad3d1403cdc10528815ae71

    SHA1

    aa99c5af5766e1ebe8781c19f6a5b2a458569a6b

    SHA256

    3b0fe9486fe9ba1f6df80fd06591df664393353ef190e5fd2cbb4133486e7afe

    SHA512

    349d3ba39d71f11d5f7d2c97762457776a017fd76f14feabbfedbee5c928b041eb45cf0f2f56cecadc44c784d3608aee9a0095cce5f99353eec5f3b56871e708

  • C:\Users\Admin\AppData\Roaming\update.exe

    Filesize

    45KB

    MD5

    24de871a8fa5bc8a878ae2b76ccf7081

    SHA1

    c31b38ed40a3e89d2c156851740cf50c6b42441e

    SHA256

    659a6386bb99408c651bbadc023de111e967f887c92e66f83d38208f8eee3afc

    SHA512

    9bfad714aa138a4de3c568540ae07ea65c57f4230748d74561a18dc125de1e47bb1fa27c4fb30b1d52d554e240c48435e60d2c46989453fffa8fe1930195e859

  • memory/2564-13-0x0000000074860000-0x0000000075010000-memory.dmp

    Filesize

    7.7MB

  • memory/2564-14-0x0000000074860000-0x0000000075010000-memory.dmp

    Filesize

    7.7MB

  • memory/4816-0-0x000000007486E000-0x000000007486F000-memory.dmp

    Filesize

    4KB

  • memory/4816-1-0x0000000000020000-0x0000000000032000-memory.dmp

    Filesize

    72KB

  • memory/4816-2-0x0000000074860000-0x0000000075010000-memory.dmp

    Filesize

    7.7MB

  • memory/4816-3-0x00000000048E0000-0x000000000497C000-memory.dmp

    Filesize

    624KB

  • memory/4816-8-0x0000000074860000-0x0000000075010000-memory.dmp

    Filesize

    7.7MB