Analysis

  • max time kernel
    150s
  • max time network
    134s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20241007-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20241007-enlocale:en-usos:windows10-2004-x64system
  • submitted
    10-11-2024 05:33

General

  • Target

    Client.exe

  • Size

    48KB

  • MD5

    3b4c1a3663d6d5ae561b793822b045ab

  • SHA1

    2ef8222de19762ab8558922b3ba3cfe53285b7ae

  • SHA256

    56ab78b1f5f73c93d063d4c85837353b96c19bdacecb1d4ed955d170d2553980

  • SHA512

    034bdc45bed22d7ad968ce7b6747ba2dfb80d350a82f77d291e01bb0076fb69e7fa79ff4f4b8160ae6779d466123fe50278c7c8ee3d04ce0c3ff9b2202e27b16

  • SSDEEP

    768:1UcRUbDILQe08+bixtelDSN+iV08YbygextUBl/of1vEgK/JbWfVc6KN:mc8ExtKDs4zb10yBJK1nkJbWfVclN

Score
10/10

Malware Config

Extracted

Family

asyncrat

Version

1.0.7

Botnet

Default

C2

127.0.0.1:8848

Mutex

DcRatMutex_qwqdanchun

Attributes
  • delay

    1

  • install

    true

  • install_file

    opus hook injector.exe

  • install_folder

    %AppData%

aes.plain

Signatures

  • AsyncRat

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

  • Asyncrat family
  • 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
  • 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 64 IoCs
  • Suspicious use of AdjustPrivilegeToken 2 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\Client.exe
    "C:\Users\Admin\AppData\Local\Temp\Client.exe"
    1⤵
    • Checks computer location settings
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:1320
    • C:\Windows\System32\cmd.exe
      "C:\Windows\System32\cmd.exe" /c schtasks /create /f /sc onlogon /rl highest /tn "opus hook injector" /tr '"C:\Users\Admin\AppData\Roaming\opus hook injector.exe"' & exit
      2⤵
      • Suspicious use of WriteProcessMemory
      PID:4512
      • C:\Windows\system32\schtasks.exe
        schtasks /create /f /sc onlogon /rl highest /tn "opus hook injector" /tr '"C:\Users\Admin\AppData\Roaming\opus hook injector.exe"'
        3⤵
        • Scheduled Task/Job: Scheduled Task
        PID:4144
    • C:\Windows\system32\cmd.exe
      C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\tmp8A1F.tmp.bat""
      2⤵
      • Suspicious use of WriteProcessMemory
      PID:4716
      • C:\Windows\system32\timeout.exe
        timeout 3
        3⤵
        • Delays execution with timeout.exe
        PID:1700
      • C:\Users\Admin\AppData\Roaming\opus hook injector.exe
        "C:\Users\Admin\AppData\Roaming\opus hook injector.exe"
        3⤵
        • Executes dropped EXE
        • Suspicious behavior: EnumeratesProcesses
        • Suspicious use of AdjustPrivilegeToken
        PID:2208

Network

MITRE ATT&CK Enterprise v15

Replay Monitor

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Downloads

  • C:\Users\Admin\AppData\Local\Temp\tmp8A1F.tmp.bat

    Filesize

    162B

    MD5

    2d89521f6956aed9f64bbb5f9b5b936d

    SHA1

    29ea7f250ec5edd123570a9d13df3c96075869ab

    SHA256

    df7c9e59f28a4c64efe5f8e021b22cf517cd9bc222d84bd2268b2aea5561b200

    SHA512

    be08836d925f2e22841fafaab4bc59549d5dc4a2623bfaca6dbcb0e600955b97845e65df6b9e2782563be296c2bf746fce5429d549f1a3506de18a722aab891b

  • C:\Users\Admin\AppData\Roaming\opus hook injector.exe

    Filesize

    48KB

    MD5

    3b4c1a3663d6d5ae561b793822b045ab

    SHA1

    2ef8222de19762ab8558922b3ba3cfe53285b7ae

    SHA256

    56ab78b1f5f73c93d063d4c85837353b96c19bdacecb1d4ed955d170d2553980

    SHA512

    034bdc45bed22d7ad968ce7b6747ba2dfb80d350a82f77d291e01bb0076fb69e7fa79ff4f4b8160ae6779d466123fe50278c7c8ee3d04ce0c3ff9b2202e27b16

  • memory/1320-0-0x00007FFE394C3000-0x00007FFE394C5000-memory.dmp

    Filesize

    8KB

  • memory/1320-1-0x00000000009A0000-0x00000000009B2000-memory.dmp

    Filesize

    72KB

  • memory/1320-2-0x00007FFE394C0000-0x00007FFE39F81000-memory.dmp

    Filesize

    10.8MB

  • memory/1320-7-0x00007FFE394C0000-0x00007FFE39F81000-memory.dmp

    Filesize

    10.8MB