Analysis

  • max time kernel
    144s
  • max time network
    148s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20240802-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20240802-enlocale:en-usos:windows10-2004-x64system
  • submitted
    08-08-2024 01:50

General

  • Target

    AsyncClient.exe

  • Size

    45KB

  • MD5

    2f0206e9dd15d9dccb2ecf93e7cf8ce8

  • SHA1

    48223ea372b29b082e8f44c610ffc0edd88ed2ae

  • SHA256

    24fa23a1908d5afe4a323872a2df703ecdc1fe033d321423c6c60f983d8d1f6e

  • SHA512

    0790798f4a11cbf09c2a1dc74ef92c1b2f84c3b659efec9df9099a1eaab9c6a00c430c8316aaefa94da206b589741c45e7f0bf56cd3b58e8e43f8a8130ff8160

  • SSDEEP

    768:puwpFTAY3IQWUe9jqmo2qLoKjPGaG6PIyzjbFgX3i+7Qs0M48wDdOTwBDZ6x:puwpFTA4/2xKTkDy3bCXS+cs07tgmd6x

Malware Config

Extracted

Family

asyncrat

Version

0.5.8

Botnet

Default

C2

127.0.0.1:6606

127.0.0.1:7707

127.0.0.1:8808

Mutex

ZC7aTuQsZ3YU

Attributes
  • delay

    3

  • install

    true

  • install_file

    new rat.exe

  • install_folder

    %AppData%

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
  • 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 21 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:2964
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /c schtasks /create /f /sc onlogon /rl highest /tn "new rat" /tr '"C:\Users\Admin\AppData\Roaming\new rat.exe"' & exit
      2⤵
      • System Location Discovery: System Language Discovery
      • Suspicious use of WriteProcessMemory
      PID:4600
      • C:\Windows\SysWOW64\schtasks.exe
        schtasks /create /f /sc onlogon /rl highest /tn "new rat" /tr '"C:\Users\Admin\AppData\Roaming\new rat.exe"'
        3⤵
        • System Location Discovery: System Language Discovery
        • Scheduled Task/Job: Scheduled Task
        PID:4040
    • C:\Windows\SysWOW64\cmd.exe
      C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\tmpCDEF.tmp.bat""
      2⤵
      • System Location Discovery: System Language Discovery
      • Suspicious use of WriteProcessMemory
      PID:3996
      • C:\Windows\SysWOW64\timeout.exe
        timeout 3
        3⤵
        • System Location Discovery: System Language Discovery
        • Delays execution with timeout.exe
        PID:3908
      • C:\Users\Admin\AppData\Roaming\new rat.exe
        "C:\Users\Admin\AppData\Roaming\new rat.exe"
        3⤵
        • Executes dropped EXE
        • System Location Discovery: System Language Discovery
        • Suspicious use of AdjustPrivilegeToken
        PID:824

Network

MITRE ATT&CK Enterprise v15

Replay Monitor

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Downloads

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

    Filesize

    151B

    MD5

    23b31c02ae5256542c49a2e0b70c0633

    SHA1

    80b81506421fb20f73ffef3fe09dfdca2fe467a7

    SHA256

    a8b076f234dc8bc2db591fc74f9b2b275fa62c6ed164ada71c3a91c036ed719d

    SHA512

    587d4fe9975570132fab5ad1fcee193e0fd5b34f9db4cbf06a090ab10e0a5cbd98e83f1351d48cb54cc7dc735bd956308a62c3b9629326b4c09ffb86021556a7

  • C:\Users\Admin\AppData\Roaming\new rat.exe

    Filesize

    45KB

    MD5

    2f0206e9dd15d9dccb2ecf93e7cf8ce8

    SHA1

    48223ea372b29b082e8f44c610ffc0edd88ed2ae

    SHA256

    24fa23a1908d5afe4a323872a2df703ecdc1fe033d321423c6c60f983d8d1f6e

    SHA512

    0790798f4a11cbf09c2a1dc74ef92c1b2f84c3b659efec9df9099a1eaab9c6a00c430c8316aaefa94da206b589741c45e7f0bf56cd3b58e8e43f8a8130ff8160

  • memory/824-13-0x0000000074D70000-0x0000000075520000-memory.dmp

    Filesize

    7.7MB

  • memory/824-14-0x0000000074D70000-0x0000000075520000-memory.dmp

    Filesize

    7.7MB

  • memory/2964-0-0x0000000074E1E000-0x0000000074E1F000-memory.dmp

    Filesize

    4KB

  • memory/2964-1-0x0000000000810000-0x0000000000822000-memory.dmp

    Filesize

    72KB

  • memory/2964-2-0x0000000074E10000-0x00000000755C0000-memory.dmp

    Filesize

    7.7MB

  • memory/2964-3-0x00000000051F0000-0x000000000528C000-memory.dmp

    Filesize

    624KB

  • memory/2964-8-0x0000000074E10000-0x00000000755C0000-memory.dmp

    Filesize

    7.7MB