Analysis

  • max time kernel
    151s
  • max time network
    151s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20240226-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20240226-enlocale:en-usos:windows10-2004-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
  • 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).

  • 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 22 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
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:1904
    • 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:4056
      • 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:628
    • C:\Windows\SysWOW64\cmd.exe
      C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\tmp335F.tmp.bat""
      2⤵
      • Suspicious use of WriteProcessMemory
      PID:452
      • C:\Windows\SysWOW64\timeout.exe
        timeout 3
        3⤵
        • Delays execution with timeout.exe
        PID:4988
      • C:\Users\Admin\AppData\Roaming\test.exe
        "C:\Users\Admin\AppData\Roaming\test.exe"
        3⤵
        • Executes dropped EXE
        • Suspicious use of AdjustPrivilegeToken
        PID:764
  • C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe
    "C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe" --type=utility --utility-sub-type=asset_store.mojom.AssetStoreService --lang=en-US --service-sandbox-type=asset_store_service --no-appcompat-clear --mojo-platform-channel-handle=4264 --field-trial-handle=2656,i,16940681401824032220,151921362336696246,262144 --variations-seed-version /prefetch:8
    1⤵
      PID:1548

    Network

          MITRE ATT&CK Enterprise v15

          Replay Monitor

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          Downloads

          • C:\Users\Admin\AppData\Local\Temp\tmp335F.tmp.bat

            Filesize

            148B

            MD5

            5fa55660c88c837db90adf9958fe28ce

            SHA1

            f7e248a53f0f650a6f8e27427fba11e1c7010fa0

            SHA256

            63a1a9a23023aa29057fc517ef1532b58f1824183765ee744800773a16c6fd70

            SHA512

            7ba5d44d67cb74fb47cd3fc18d0a05530d73464f9fd3793569dd1d892f0ad9e65a8fedd48d8c2bb3974cd7311e2c720e92889a7bef9538a88d2f83c376be40fd

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

            Filesize

            47KB

            MD5

            1318c166e2823474696400cb49c69019

            SHA1

            41cac1850c0e996752475baa19716b0dfcf88351

            SHA256

            5b23cda7e61a7e54331995b5eab48efd59ff50455881027ea8bd5cd70a6833a0

            SHA512

            1fad54e3f6b8c1ac376456aa4f3be361898e9126955425f75181a7f9d2e28e09597a60a7ccd8588af47ebad9b3672ab53e09321b82bc51df4536442c96bc157f

          • memory/764-13-0x0000000074E30000-0x00000000755E0000-memory.dmp

            Filesize

            7.7MB

          • memory/764-14-0x00000000053C0000-0x00000000053D0000-memory.dmp

            Filesize

            64KB

          • memory/764-15-0x0000000074E30000-0x00000000755E0000-memory.dmp

            Filesize

            7.7MB

          • memory/764-16-0x00000000053C0000-0x00000000053D0000-memory.dmp

            Filesize

            64KB

          • memory/1904-0-0x0000000074E30000-0x00000000755E0000-memory.dmp

            Filesize

            7.7MB

          • memory/1904-1-0x0000000000920000-0x0000000000932000-memory.dmp

            Filesize

            72KB

          • memory/1904-2-0x0000000005370000-0x0000000005380000-memory.dmp

            Filesize

            64KB

          • memory/1904-3-0x0000000005420000-0x00000000054BC000-memory.dmp

            Filesize

            624KB

          • memory/1904-9-0x0000000074E30000-0x00000000755E0000-memory.dmp

            Filesize

            7.7MB