Analysis

  • max time kernel
    149s
  • max time network
    156s
  • platform
    windows10-1703_x64
  • resource
    win10-20240611-en
  • resource tags

    arch:x64arch:x86image:win10-20240611-enlocale:en-usos:windows10-1703-x64system
  • submitted
    29-06-2024 11:27

General

  • Target

    normal.exe

  • Size

    45KB

  • MD5

    24de871a8fa5bc8a878ae2b76ccf7081

  • SHA1

    c31b38ed40a3e89d2c156851740cf50c6b42441e

  • SHA256

    659a6386bb99408c651bbadc023de111e967f887c92e66f83d38208f8eee3afc

  • SHA512

    9bfad714aa138a4de3c568540ae07ea65c57f4230748d74561a18dc125de1e47bb1fa27c4fb30b1d52d554e240c48435e60d2c46989453fffa8fe1930195e859

  • SSDEEP

    768:yu1a71T3EiJfWUzDydmo2qzh58SIkOPILzjb5gs3i+uROUHVnloBDZ7x:yu1a71T3xq2sNF3L3bWsS+yHVlOd7x

Score
10/10

Malware Config

Extracted

Family

asyncrat

Version

0.5.8

Botnet

Default

Mutex

dzacwFnyvZFC

Attributes
  • delay

    3

  • install

    true

  • install_file

    update.exe

  • install_folder

    %AppData%

  • pastebin_config

    https://pastebin.com/raw/K16mDJV5

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
  • Legitimate hosting services abused for malware hosting/C2 1 TTPs 28 IoCs
  • Drops file in Windows directory 2 IoCs
  • Enumerates physical storage devices 1 TTPs

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

  • Checks SCSI registry key(s) 3 TTPs 3 IoCs

    SCSI information is often read in order to detect sandboxing environments.

  • Checks processor information in registry 2 TTPs 2 IoCs

    Processor information is often read in order to detect sandboxing environments.

  • Delays execution with timeout.exe 1 IoCs
  • Gathers network information 2 TTPs 1 IoCs

    Uses commandline utility to view network configuration.

  • Modifies registry class 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 45 IoCs
  • Suspicious use of AdjustPrivilegeToken 7 IoCs
  • Suspicious use of FindShellTrayWindow 57 IoCs
  • Suspicious use of SendNotifyMessage 57 IoCs
  • Suspicious use of WriteProcessMemory 17 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\normal.exe
    "C:\Users\Admin\AppData\Local\Temp\normal.exe"
    1⤵
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:2584
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /c schtasks /create /f /sc onlogon /rl highest /tn "update" /tr '"C:\Users\Admin\AppData\Roaming\update.exe"' & exit
      2⤵
      • Suspicious use of WriteProcessMemory
      PID:2784
      • C:\Windows\SysWOW64\schtasks.exe
        schtasks /create /f /sc onlogon /rl highest /tn "update" /tr '"C:\Users\Admin\AppData\Roaming\update.exe"'
        3⤵
        • Scheduled Task/Job: Scheduled Task
        PID:4248
    • C:\Windows\SysWOW64\cmd.exe
      C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\tmpE772.tmp.bat""
      2⤵
      • Suspicious use of WriteProcessMemory
      PID:4720
      • C:\Windows\SysWOW64\timeout.exe
        timeout 3
        3⤵
        • Delays execution with timeout.exe
        PID:4664
      • C:\Users\Admin\AppData\Roaming\update.exe
        "C:\Users\Admin\AppData\Roaming\update.exe"
        3⤵
        • Executes dropped EXE
        • Suspicious use of AdjustPrivilegeToken
        PID:3144
  • C:\Windows\system32\taskmgr.exe
    "C:\Windows\system32\taskmgr.exe" /4
    1⤵
    • Drops file in Windows directory
    • Checks SCSI registry key(s)
    • Checks processor information in registry
    • Modifies registry class
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of FindShellTrayWindow
    • Suspicious use of SendNotifyMessage
    PID:1280
  • C:\Windows\System32\rundll32.exe
    C:\Windows\System32\rundll32.exe C:\Windows\System32\shell32.dll,SHCreateLocalServerRunDll {9aa46009-3ce0-458a-a354-715610a075e6} -Embedding
    1⤵
      PID:4316
    • C:\Windows\system32\cmd.exe
      "C:\Windows\system32\cmd.exe"
      1⤵
      • Suspicious use of WriteProcessMemory
      PID:5020
      • C:\Windows\system32\ipconfig.exe
        ipconfig
        2⤵
        • Gathers network information
        PID:4468

    Network

    MITRE ATT&CK Enterprise v15

    Replay Monitor

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    Downloads

    • C:\Users\Admin\AppData\Local\Temp\tmpE772.tmp.bat

      Filesize

      150B

      MD5

      5e2719daf60432c9227c2112e48b0b90

      SHA1

      de96bf8cdda01a98d94419ae38ca9d6363ee918e

      SHA256

      19ab6ab1d7f4bcec1ef25bb05eb219a16e5ee6cf97507cd3152cf4869151a344

      SHA512

      e22f37479e85d22224c206d400784b726c7ae4ac4d6a4d90685c9d272b0218c68442804521e38b261a266f40005af8de80d7d00e6249bd4a961f498a24556280

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

      Filesize

      45KB

      MD5

      24de871a8fa5bc8a878ae2b76ccf7081

      SHA1

      c31b38ed40a3e89d2c156851740cf50c6b42441e

      SHA256

      659a6386bb99408c651bbadc023de111e967f887c92e66f83d38208f8eee3afc

      SHA512

      9bfad714aa138a4de3c568540ae07ea65c57f4230748d74561a18dc125de1e47bb1fa27c4fb30b1d52d554e240c48435e60d2c46989453fffa8fe1930195e859

    • memory/2584-0-0x00007FFDFC070000-0x00007FFDFC24B000-memory.dmp

      Filesize

      1.9MB

    • memory/2584-1-0x0000000000580000-0x0000000000592000-memory.dmp

      Filesize

      72KB

    • memory/2584-2-0x0000000004EF0000-0x0000000004F8C000-memory.dmp

      Filesize

      624KB

    • memory/2584-7-0x00007FFDFC070000-0x00007FFDFC24B000-memory.dmp

      Filesize

      1.9MB