Analysis

  • max time kernel
    146s
  • max time network
    150s
  • platform
    windows11-21h2_x64
  • resource
    win11-20240221-en
  • resource tags

    arch:x64arch:x86image:win11-20240221-enlocale:en-usos:windows11-21h2-x64system
  • submitted
    01/03/2024, 20:55

General

  • Target

    AsyncClient.exe

  • Size

    47KB

  • MD5

    1318c166e2823474696400cb49c69019

  • SHA1

    41cac1850c0e996752475baa19716b0dfcf88351

  • SHA256

    5b23cda7e61a7e54331995b5eab48efd59ff50455881027ea8bd5cd70a6833a0

  • SHA512

    1fad54e3f6b8c1ac376456aa4f3be361898e9126955425f75181a7f9d2e28e09597a60a7ccd8588af47ebad9b3672ab53e09321b82bc51df4536442c96bc157f

  • SSDEEP

    768:tuEs9THvkHCWU0neImo2q8HWdbFk+AH5PIM0690bRkYnT/fGdaRSl8BDZvx:tuEs9THc72ibF4H2M06abR1DOsRldvx

Score
10/10

Malware Config

Extracted

Family

asyncrat

Version

0.5.8

Botnet

adsf

C2

FearME-55506.portmap.host:5508

FearME-55506.portmap.host:55506

Mutex

LlyPtPKotdCY

Attributes
  • delay

    3

  • install

    true

  • install_file

    test.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
  • 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.

  • Delays execution with timeout.exe 1 IoCs
  • Suspicious behavior: EnumeratesProcesses 19 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⤵
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:4000
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /c schtasks /create /f /sc onlogon /rl highest /tn "test" /tr '"C:\Users\Admin\AppData\Roaming\test.exe"' & exit
      2⤵
      • Suspicious use of WriteProcessMemory
      PID:484
      • C:\Windows\SysWOW64\schtasks.exe
        schtasks /create /f /sc onlogon /rl highest /tn "test" /tr '"C:\Users\Admin\AppData\Roaming\test.exe"'
        3⤵
        • Creates scheduled task(s)
        PID:3124
    • C:\Windows\SysWOW64\cmd.exe
      C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\tmp6699.tmp.bat""
      2⤵
      • Suspicious use of WriteProcessMemory
      PID:3580
      • C:\Windows\SysWOW64\timeout.exe
        timeout 3
        3⤵
        • Delays execution with timeout.exe
        PID:1712
      • C:\Users\Admin\AppData\Roaming\test.exe
        "C:\Users\Admin\AppData\Roaming\test.exe"
        3⤵
        • Executes dropped EXE
        • Suspicious use of AdjustPrivilegeToken
        PID:1584

Network

        MITRE ATT&CK Enterprise v15

        Replay Monitor

        Loading Replay Monitor...

        Downloads

        • C:\Users\Admin\AppData\Local\Temp\tmp6699.tmp.bat

          Filesize

          148B

          MD5

          373535f30badea65c0c6b4115711f4da

          SHA1

          919e3f7e01c705d0cf812c49e0920a539517bffe

          SHA256

          45b05de917e3250057cb33b00649b54d55b1b67cf83738517f4dd9445a74635a

          SHA512

          feabb1b5cbe7e9408752f86693ef3a5e122d686df4f43f0b1b8a028c1744b5df1021529771530cbe68102832c5dc104a2ddc08e59fbd31b84f3081e320bbfb18

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

          Filesize

          47KB

          MD5

          1318c166e2823474696400cb49c69019

          SHA1

          41cac1850c0e996752475baa19716b0dfcf88351

          SHA256

          5b23cda7e61a7e54331995b5eab48efd59ff50455881027ea8bd5cd70a6833a0

          SHA512

          1fad54e3f6b8c1ac376456aa4f3be361898e9126955425f75181a7f9d2e28e09597a60a7ccd8588af47ebad9b3672ab53e09321b82bc51df4536442c96bc157f

        • memory/1584-13-0x0000000074BC0000-0x0000000075371000-memory.dmp

          Filesize

          7.7MB

        • memory/1584-14-0x0000000005730000-0x0000000005740000-memory.dmp

          Filesize

          64KB

        • memory/1584-15-0x0000000074BC0000-0x0000000075371000-memory.dmp

          Filesize

          7.7MB

        • memory/1584-16-0x0000000005730000-0x0000000005740000-memory.dmp

          Filesize

          64KB

        • memory/4000-0-0x0000000000250000-0x0000000000262000-memory.dmp

          Filesize

          72KB

        • memory/4000-1-0x0000000074C70000-0x0000000075421000-memory.dmp

          Filesize

          7.7MB

        • memory/4000-2-0x0000000004D10000-0x0000000004D20000-memory.dmp

          Filesize

          64KB

        • memory/4000-3-0x0000000004D20000-0x0000000004DBC000-memory.dmp

          Filesize

          624KB

        • memory/4000-8-0x0000000074C70000-0x0000000075421000-memory.dmp

          Filesize

          7.7MB