Overview

overview

10

Static

static

10

Testing FR.exe

windows7-x64

10

Testing FR.exe

windows10-2004-x64

10

Analysis

  • max time kernel
    145s
  • max time network
    148s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20230220-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20230220-enlocale:en-usos:windows10-2004-x64system
  • submitted
    21/03/2023, 02:40

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General

  • Target
    Testing FR.exe
  • Size 48KB
  • Sample230321-c5xp6sae51
  • SHA256 c69b81e6499b64d01ed7b231985f9061e8553309cbd64b00d1699e71d58fd4c3
  • MD5 SHA1 SHA512 SSDEEP
Score
10/10
asyncratdefaultrat

Malware Config

Extracted

Family

  • asyncrat

Version

  • 1.0.7

Botnet

  • Default

C2

  • 127.0.0.1:8809

  • thebest39393.ddns.net:8809

Mutex

  • DcRatMutex_qwqdanchun

Attributes
  • delay

    1

  • install

    true

  • install_file

    Microsoft Services.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). Likely ransomware behaviour.

  • 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 23 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\Testing FR.exe
    "C:\Users\Admin\AppData\Local\Temp\Testing FR.exe"
    1⤵
    • Checks computer location settings
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:4872
    • C:\Windows\System32\cmd.exe
      "C:\Windows\System32\cmd.exe" /c schtasks /create /f /sc onlogon /rl highest /tn "Microsoft Services" /tr '"C:\Users\Admin\AppData\Roaming\Microsoft Services.exe"' & exit
      2⤵
      • Suspicious use of WriteProcessMemory
      PID:2440
      • C:\Windows\system32\schtasks.exe
        schtasks /create /f /sc onlogon /rl highest /tn "Microsoft Services" /tr '"C:\Users\Admin\AppData\Roaming\Microsoft Services.exe"'
        3⤵
        • Creates scheduled task(s)
        PID:3468
    • C:\Windows\system32\cmd.exe
      C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\tmp7823.tmp.bat""
      2⤵
      • Suspicious use of WriteProcessMemory
      PID:3376
      • C:\Windows\system32\timeout.exe
        timeout 3
        3⤵
        • Delays execution with timeout.exe
        PID:1200
      • C:\Users\Admin\AppData\Roaming\Microsoft Services.exe
        "C:\Users\Admin\AppData\Roaming\Microsoft Services.exe"
        3⤵
        • Executes dropped EXE
        • Suspicious use of AdjustPrivilegeToken
        PID:972

Network

        MITRE ATT&CK Enterprise v6

        Replay Monitor

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        Downloads

        tmp7823.tmp.bat
        • Path C:\Users\Admin\AppData\Local\Temp\tmp7823.tmp.bat
        • Size 162B
        • SHA256 4ea8c80ae215bc81d056d1185364d29c45bb86f58345dea823a0a26318457aa7
        • MD5 SHA1 SHA512
        Submit Download

        Microsoft Services.exe
        • Path C:\Users\Admin\AppData\Roaming\Microsoft Services.exe
        • Size 48KB
        • SHA256 c69b81e6499b64d01ed7b231985f9061e8553309cbd64b00d1699e71d58fd4c3
        • MD5 SHA1 SHA512 SSDEEP
        Submit Download

        Microsoft Services.exe
        • Path C:\Users\Admin\AppData\Roaming\Microsoft Services.exe
        • Size 48KB
        • SHA256 c69b81e6499b64d01ed7b231985f9061e8553309cbd64b00d1699e71d58fd4c3
        • MD5 SHA1 SHA512 SSDEEP
        Submit Download

        memory/972-143-0x000000001B690000-0x000000001B6A0000-memory.dmp
        Download

        memory/972-144-0x000000001B690000-0x000000001B6A0000-memory.dmp
        Download

        memory/4872-133-0x0000000000500000-0x0000000000512000-memory.dmp
        Download

        memory/4872-134-0x000000001BD50000-0x000000001BD60000-memory.dmp
        Download