Overview

overview

10

Static

static

10

RuntimeBroker.exe

windows7-x64

10

RuntimeBroker.exe

windows10-2004-x64

10

Analysis

  • max time kernel
    103s
  • max time network
    134s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20230220-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20230220-enlocale:en-usos:windows10-2004-x64system
  • submitted
    30/05/2023, 00:05

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General

  • Target
    RuntimeBroker.exe
  • Size 63KB
  • Sample230530-adbbraea77
  • SHA256 ae799c3696cadbbe3a8d2036f67685e01f385f214f47b0c7d094a15159688e71
  • MD5 SHA1 SHA512 SSDEEP
Score
10/10
asyncratdefaultrat

Malware Config

Extracted

Family

  • asyncrat

Botnet

  • Default

C2

  • udmansoud-59712.portmap.host:59712

Mutex

  • ikU2zF吉诶T8تXω比9ΖNIר

Attributes
  • delay

    1

  • install

    true

  • install_file

    svchost.exe

  • install_folder

    %AppData%

aes.plain

Signatures

  • AsyncRat

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

    ratasyncrat
  • Async RAT payload 3 IoCs
    rat
  • 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).

  • Creates scheduled task(s) 1 TTPs 1 IoCs

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

    persistence
  • Delays execution with timeout.exe 1 IoCs
    evasion
  • Suspicious behavior: EnumeratesProcesses 25 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.

    persistence

Processes

  • C:\Users\Admin\AppData\Local\Temp\RuntimeBroker.exe
    "C:\Users\Admin\AppData\Local\Temp\RuntimeBroker.exe"
    1⤵
    • Checks computer location settings
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:3700
    • C:\Windows\System32\cmd.exe
      "C:\Windows\System32\cmd.exe" /c schtasks /create /f /sc onlogon /rl highest /tn "svchost" /tr '"C:\Users\Admin\AppData\Roaming\svchost.exe"' & exit
      2⤵
      • Suspicious use of WriteProcessMemory
      PID:4508
      • C:\Windows\system32\schtasks.exe
        schtasks /create /f /sc onlogon /rl highest /tn "svchost" /tr '"C:\Users\Admin\AppData\Roaming\svchost.exe"'
        3⤵
        • Creates scheduled task(s)
        PID:3124
    • C:\Windows\system32\cmd.exe
      C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\tmp6EDC.tmp.bat""
      2⤵
      • Suspicious use of WriteProcessMemory
      PID:4608
      • C:\Windows\system32\timeout.exe
        timeout 3
        3⤵
        • Delays execution with timeout.exe
        PID:3436
      • C:\Users\Admin\AppData\Roaming\svchost.exe
        "C:\Users\Admin\AppData\Roaming\svchost.exe"
        3⤵
        • Executes dropped EXE
        • Suspicious use of AdjustPrivilegeToken
        PID:4280

Network

        MITRE ATT&CK Enterprise v6

        Replay Monitor

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        Downloads

        tmp6EDC.tmp.bat
        • Path C:\Users\Admin\AppData\Local\Temp\tmp6EDC.tmp.bat
        • Size 151B
        • SHA256 6ebaf5daf9d292f7754e9ecee79fcf8a469fc2307521f5af899837f9fa7fda25
        • MD5 SHA1 SHA512
        Submit Download

        svchost.exe
        • Path C:\Users\Admin\AppData\Roaming\svchost.exe
        • Size 63KB
        • SHA256 ae799c3696cadbbe3a8d2036f67685e01f385f214f47b0c7d094a15159688e71
        • MD5 SHA1 SHA512 SSDEEP
        Submit Download

        svchost.exe
        • Path C:\Users\Admin\AppData\Roaming\svchost.exe
        • Size 63KB
        • SHA256 ae799c3696cadbbe3a8d2036f67685e01f385f214f47b0c7d094a15159688e71
        • MD5 SHA1 SHA512 SSDEEP
        Submit Download

        memory/3700-133-0x00000000003F0000-0x0000000000406000-memory.dmp
        Download