Analysis

  • max time kernel
    119s
  • max time network
    147s
  • platform
    windows7_x64
  • resource
    win7-20241023-en
  • resource tags

    arch:x64arch:x86image:win7-20241023-enlocale:en-usos:windows7-x64system
  • submitted
    27-11-2024 17:07

General

  • Target

    Start.exe

  • Size

    45KB

  • MD5

    b733e729705bf66c1e5c66d97e247701

  • SHA1

    25eec814abdf1fc6afe621e16aa89c4eb42616b9

  • SHA256

    9081f9cf986ed111d976a07ee26fc2b1b9992301344197d6d3f83fe0d2616023

  • SHA512

    09b59b8942c1409a03ca4e7f77c6007160af4d557386b766516dba392750869c017d0fd5d6fbbfcbb3e559a70ad42adcb498595df186be180cfc04e921d74320

  • SSDEEP

    768:Nu2/0TckJ26WUsFvgmo2q7MKjPGaG6PIyzjbFgX3iWlcF4S0ru1pYI0sBDZOx:Nu2/0TceH2ZKTkDy3bCXSWlc6SKuRjdM

Malware Config

Extracted

Family

asyncrat

Version

0.5.8

Botnet

Default

C2

66.66.146.74:9511

Mutex

nwJFeGdDXcL2

Attributes
  • delay

    3

  • install

    true

  • install_file

    System32.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
  • Executes dropped EXE 1 IoCs
  • Loads dropped DLL 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 3 IoCs
  • Suspicious use of AdjustPrivilegeToken 2 IoCs
  • Suspicious use of WriteProcessMemory 20 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\Start.exe
    "C:\Users\Admin\AppData\Local\Temp\Start.exe"
    1⤵
    • System Location Discovery: System Language Discovery
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:1720
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /c schtasks /create /f /sc onlogon /rl highest /tn "System32" /tr '"C:\Users\Admin\AppData\Roaming\System32.exe"' & exit
      2⤵
      • System Location Discovery: System Language Discovery
      • Suspicious use of WriteProcessMemory
      PID:1760
      • C:\Windows\SysWOW64\schtasks.exe
        schtasks /create /f /sc onlogon /rl highest /tn "System32" /tr '"C:\Users\Admin\AppData\Roaming\System32.exe"'
        3⤵
        • System Location Discovery: System Language Discovery
        • Scheduled Task/Job: Scheduled Task
        PID:2820
    • C:\Windows\SysWOW64\cmd.exe
      cmd /c ""C:\Users\Admin\AppData\Local\Temp\tmpA737.tmp.bat""
      2⤵
      • Loads dropped DLL
      • System Location Discovery: System Language Discovery
      • Suspicious use of WriteProcessMemory
      PID:2216
      • C:\Windows\SysWOW64\timeout.exe
        timeout 3
        3⤵
        • System Location Discovery: System Language Discovery
        • Delays execution with timeout.exe
        PID:2120
      • C:\Users\Admin\AppData\Roaming\System32.exe
        "C:\Users\Admin\AppData\Roaming\System32.exe"
        3⤵
        • Executes dropped EXE
        • System Location Discovery: System Language Discovery
        • Suspicious use of AdjustPrivilegeToken
        PID:2864

Network

MITRE ATT&CK Enterprise v15

Replay Monitor

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Downloads

  • C:\Users\Admin\AppData\Local\Temp\CabC42B.tmp

    Filesize

    70KB

    MD5

    49aebf8cbd62d92ac215b2923fb1b9f5

    SHA1

    1723be06719828dda65ad804298d0431f6aff976

    SHA256

    b33efcb95235b98b48508e019afa4b7655e80cf071defabd8b2123fc8b29307f

    SHA512

    bf86116b015fb56709516d686e168e7c9c68365136231cc51d0b6542ae95323a71d2c7acec84aad7dcecc2e410843f6d82a0a6d51b9acfc721a9c84fdd877b5b

  • C:\Users\Admin\AppData\Local\Temp\tmpA737.tmp.bat

    Filesize

    152B

    MD5

    07f29dfd553e422ad184a2c27970ee24

    SHA1

    e589193f6eb6741b6fb4e14f4928bf92eabe2343

    SHA256

    19ca48e050f4b15f293c0cbd2d974a8f1b867af95dde88182a7199f7f1d2221d

    SHA512

    3f0ecca66ee44e71837ec346ddaab501c1d54f74b64be202b0a03950da92ecc98007b185aa88a35bc9a67400d635022e06f2eb1a049d79ec313a414690f51d73

  • \Users\Admin\AppData\Roaming\System32.exe

    Filesize

    45KB

    MD5

    b733e729705bf66c1e5c66d97e247701

    SHA1

    25eec814abdf1fc6afe621e16aa89c4eb42616b9

    SHA256

    9081f9cf986ed111d976a07ee26fc2b1b9992301344197d6d3f83fe0d2616023

    SHA512

    09b59b8942c1409a03ca4e7f77c6007160af4d557386b766516dba392750869c017d0fd5d6fbbfcbb3e559a70ad42adcb498595df186be180cfc04e921d74320

  • memory/1720-0-0x000000007499E000-0x000000007499F000-memory.dmp

    Filesize

    4KB

  • memory/1720-1-0x0000000000E30000-0x0000000000E42000-memory.dmp

    Filesize

    72KB

  • memory/1720-2-0x0000000074990000-0x000000007507E000-memory.dmp

    Filesize

    6.9MB

  • memory/1720-11-0x0000000074990000-0x000000007507E000-memory.dmp

    Filesize

    6.9MB

  • memory/2864-16-0x0000000001380000-0x0000000001392000-memory.dmp

    Filesize

    72KB