Analysis

  • max time kernel
    554s
  • max time network
    870s
  • platform
    windows10-1703_x64
  • resource
    win10-20230220-en
  • resource tags

    arch:x64arch:x86image:win10-20230220-enlocale:en-usos:windows10-1703-x64system
  • submitted
    27/04/2023, 05:35

General

  • Target

    AsyncClient.exe

  • Size

    45KB

  • MD5

    5b9e5723583eb31b9d67c46b2825d6bb

  • SHA1

    44a867a74e714a77e0fc6eda42e9865370ba0937

  • SHA256

    4dcb2fbc2fcfc15556b81e2b07f84427f80435b1b312fea8b18e688a565eac6e

  • SHA512

    fade32705bd80dcdbbdeda9415ac3d7fdb1872803808f6ba000d365723642ed863ee70da38ab31906b0a83fb0aa84ea25ad50bf30a980b481a9791f95674d0ab

  • SSDEEP

    768:nugSNTokqd97WUHgAKpmo2q7HKjGKG6PIyzjbFgX3i2usR0FiXOhqAm0BDZ/x:nugSNToTdQT2mKYDy3bCXSpsCFFqABdp

Score
10/10

Malware Config

Extracted

Family

asyncrat

Version

0.5.7B

Botnet

Default

C2

127.0.0.1:61288

146.70.165.10:61288

Mutex

AsyncMutex_6SI8OkPnk

Attributes
  • delay

    3

  • install

    false

  • install_file

    Microsoft Update.exe

  • install_folder

    %AppData%

aes.plain

Signatures

  • AsyncRat

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

  • Async RAT payload 5 IoCs
  • Checks computer location settings 2 TTPs 1 IoCs

    Looks up country code configured in the registry, likely geofence.

  • Drops file in Windows directory 1 IoCs
  • Enumerates physical storage devices 1 TTPs

    Attempts to interact with connected storage/optical drive(s).

  • Suspicious use of AdjustPrivilegeToken 1 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\AsyncClient.exe
    "C:\Users\Admin\AppData\Local\Temp\AsyncClient.exe"
    1⤵
    • Checks computer location settings
    • Drops file in Windows directory
    • Suspicious use of AdjustPrivilegeToken
    PID:1872

Network

        MITRE ATT&CK Enterprise v6

        Replay Monitor

        Loading Replay Monitor...

        Downloads

        • memory/1872-118-0x00000000000A0000-0x00000000000B2000-memory.dmp

          Filesize

          72KB

        • memory/1872-119-0x0000000004A30000-0x0000000004A40000-memory.dmp

          Filesize

          64KB

        • memory/1872-122-0x0000000004FD0000-0x000000000506C000-memory.dmp

          Filesize

          624KB

        • memory/1872-123-0x00000000058C0000-0x0000000005DBE000-memory.dmp

          Filesize

          5.0MB

        • memory/1872-124-0x0000000005430000-0x0000000005496000-memory.dmp

          Filesize

          408KB

        • memory/1872-125-0x0000000004A30000-0x0000000004A40000-memory.dmp

          Filesize

          64KB

        • memory/1872-126-0x0000000006280000-0x00000000062F6000-memory.dmp

          Filesize

          472KB

        • memory/1872-127-0x00000000058A0000-0x00000000058C6000-memory.dmp

          Filesize

          152KB

        • memory/1872-128-0x0000000006250000-0x000000000626E000-memory.dmp

          Filesize

          120KB

        • memory/1872-129-0x0000000006460000-0x00000000064F2000-memory.dmp

          Filesize

          584KB

        • memory/1872-130-0x0000000006F10000-0x0000000006F32000-memory.dmp

          Filesize

          136KB

        • memory/1872-131-0x0000000006FD0000-0x0000000006FDA000-memory.dmp

          Filesize

          40KB

        • memory/1872-132-0x0000000004A30000-0x0000000004A40000-memory.dmp

          Filesize

          64KB

        • memory/1872-133-0x0000000004A30000-0x0000000004A40000-memory.dmp

          Filesize

          64KB

        • memory/1872-134-0x0000000005670000-0x0000000005696000-memory.dmp

          Filesize

          152KB

        • memory/1872-135-0x00000000001D0000-0x0000000000200000-memory.dmp

          Filesize

          192KB