Analysis

  • max time kernel
    143s
  • max time network
    151s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20241007-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20241007-enlocale:en-usos:windows10-2004-x64system
  • submitted
    28-11-2024 01:15

General

  • Target

    AsyncClient.exe

  • Size

    47KB

  • MD5

    ee97dc0328ea5ef92cdadeb280891591

  • SHA1

    916924ecdb96aa0ec227b12df2af8f5038f239ab

  • SHA256

    44b6e2af6e5e547cfc9c2c3607bd7cda4785688b60720c5501968b536ce331c9

  • SHA512

    52ecca0f00d47f9bffc50bb516988715ae2c1aaf96f3a5bb132619ebbd8a370c9eef0f33d5b67accc2ffe2187e60564fa353eef037b35be9159f17aad6e621c2

  • SSDEEP

    768:Zu6ZdTAYhbJWUh9Nzmo2qLxRQSJPVW1QMCfPIKSxlJpmqH0bAYpHZ+6GGAPMtV0g:Zu6ZdTAur2uQadMC4KSrvUbAYqMAknkU

Malware Config

Extracted

Family

asyncrat

Version

0.5.8

Botnet

Default

C2

listed-academics.gl.at.ply.gg:10068

Mutex

f7BTmla4eysw

Attributes
  • delay

    3

  • install

    true

  • install_file

    das.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).

  • System Location Discovery: System Language Discovery 1 TTPs 6 IoCs

    Attempt gather information about the system language of a victim in order to infer the geographical location of that host.

  • 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 23 IoCs
  • Suspicious use of AdjustPrivilegeToken 2 IoCs
  • Suspicious use of WriteProcessMemory 15 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\AsyncClient.exe
    "C:\Users\Admin\AppData\Local\Temp\AsyncClient.exe"
    1⤵
    • Checks computer location settings
    • System Location Discovery: System Language Discovery
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:3336
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /c schtasks /create /f /sc onlogon /rl highest /tn "das" /tr '"C:\Users\Admin\AppData\Roaming\das.exe"' & exit
      2⤵
      • System Location Discovery: System Language Discovery
      • Suspicious use of WriteProcessMemory
      PID:4204
      • C:\Windows\SysWOW64\schtasks.exe
        schtasks /create /f /sc onlogon /rl highest /tn "das" /tr '"C:\Users\Admin\AppData\Roaming\das.exe"'
        3⤵
        • System Location Discovery: System Language Discovery
        • Scheduled Task/Job: Scheduled Task
        PID:1080
    • C:\Windows\SysWOW64\cmd.exe
      C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\tmp9D3A.tmp.bat""
      2⤵
      • System Location Discovery: System Language Discovery
      • Suspicious use of WriteProcessMemory
      PID:4908
      • C:\Windows\SysWOW64\timeout.exe
        timeout 3
        3⤵
        • System Location Discovery: System Language Discovery
        • Delays execution with timeout.exe
        PID:1892
      • C:\Users\Admin\AppData\Roaming\das.exe
        "C:\Users\Admin\AppData\Roaming\das.exe"
        3⤵
        • Executes dropped EXE
        • System Location Discovery: System Language Discovery
        • Suspicious use of AdjustPrivilegeToken
        PID:3892

Network

MITRE ATT&CK Enterprise v15

Replay Monitor

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Downloads

  • C:\Users\Admin\AppData\Local\Temp\tmp9D3A.tmp.bat

    Filesize

    147B

    MD5

    949f7f8e83bd27df2c828105845cd1da

    SHA1

    93f141b01ef5aaea9b027c374934a80565bd7b1b

    SHA256

    359d9fa4999b07b1057bdefa91e9ae8b261c0bfad036484391f4b17662b1b39c

    SHA512

    20dbea08aa1c1196574154ebbd27d46e60af8d642f35128bcd4cf3972767673f678fe2e978193b76906d0634f08a305df7eeff56460e9893d0d31b1531b412a2

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

    Filesize

    47KB

    MD5

    ee97dc0328ea5ef92cdadeb280891591

    SHA1

    916924ecdb96aa0ec227b12df2af8f5038f239ab

    SHA256

    44b6e2af6e5e547cfc9c2c3607bd7cda4785688b60720c5501968b536ce331c9

    SHA512

    52ecca0f00d47f9bffc50bb516988715ae2c1aaf96f3a5bb132619ebbd8a370c9eef0f33d5b67accc2ffe2187e60564fa353eef037b35be9159f17aad6e621c2

  • memory/3336-0-0x000000007478E000-0x000000007478F000-memory.dmp

    Filesize

    4KB

  • memory/3336-1-0x0000000000160000-0x0000000000172000-memory.dmp

    Filesize

    72KB

  • memory/3336-2-0x0000000074780000-0x0000000074F30000-memory.dmp

    Filesize

    7.7MB

  • memory/3336-3-0x0000000004B50000-0x0000000004BEC000-memory.dmp

    Filesize

    624KB

  • memory/3336-8-0x0000000074780000-0x0000000074F30000-memory.dmp

    Filesize

    7.7MB

  • memory/3892-13-0x00000000746D0000-0x0000000074E80000-memory.dmp

    Filesize

    7.7MB

  • memory/3892-14-0x00000000746D0000-0x0000000074E80000-memory.dmp

    Filesize

    7.7MB