Analysis

  • max time kernel
    90s
  • max time network
    113s
  • platform
    windows10_x64
  • resource
    win10v20210408
  • submitted
    25/07/2021, 16:42

General

  • Target
    f4ad2cb7d4d6b02b1debf1d41849b71e.exe
  • Size 492KB
  • Sample210725-b5vqpsd982
  • SHA256 bf53b4b404f09c51fc30b4e683f5258b8172e0698ec61837da1e88a9704b37e8
  • MD5 SHA1 SHA512

Malware Config

Signatures

  • Downloads MZ/PE file
  • Executes dropped EXE 2 IoCs
  • Loads dropped DLL 5 IoCs
  • Reads user/profile data of local email clients 2 TTPs

    Email clients store some user data on disk where infostealers will often target it.

  • Reads user/profile data of web browsers 2 TTPs

    Infostealers often target stored browser data, which can include saved credentials etc.

  • Checks installed software on the system 1 TTPs

    Looks up Uninstall key entries in the registry to enumerate software on the system.

  • Enumerates physical storage devices 1 TTPs

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

  • Creates scheduled task(s) 1 TTPs 2 IoCs

    Schtasks is often used by malware for persistence or to perform post-infection execution.

  • Delays execution with timeout.exe 1 IoCs
  • Suspicious use of WriteProcessMemory 15 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\f4ad2cb7d4d6b02b1debf1d41849b71e.exe
    "C:\Users\Admin\AppData\Local\Temp\f4ad2cb7d4d6b02b1debf1d41849b71e.exe"
    1⤵
    • Loads dropped DLL
    • Suspicious use of WriteProcessMemory
    PID:604
    • C:\Users\Admin\AppData\Local\Temp\i8GNlo5RB3.exe
      "C:\Users\Admin\AppData\Local\Temp\i8GNlo5RB3.exe"
      2⤵
      • Executes dropped EXE
      • Suspicious use of WriteProcessMemory
      PID:3312
      • C:\Windows\SysWOW64\schtasks.exe
        /C /create /F /sc minute /mo 1 /tn "Azure-Update-Task" /tr "C:\Users\Admin\AppData\Roaming\Microsoft\Network\sqlcmd.exe"
        3⤵
        • Creates scheduled task(s)
        PID:3460
    • C:\Windows\SysWOW64\cmd.exe
      cmd.exe /C timeout /T 10 /NOBREAK > Nul & Del /f /q "C:\Users\Admin\AppData\Local\Temp\f4ad2cb7d4d6b02b1debf1d41849b71e.exe"
      2⤵
      • Suspicious use of WriteProcessMemory
      PID:1356
      • C:\Windows\SysWOW64\timeout.exe
        timeout /T 10 /NOBREAK
        3⤵
        • Delays execution with timeout.exe
        PID:3220
  • C:\Users\Admin\AppData\Roaming\Microsoft\Network\sqlcmd.exe
    C:\Users\Admin\AppData\Roaming\Microsoft\Network\sqlcmd.exe
    1⤵
    • Executes dropped EXE
    • Suspicious use of WriteProcessMemory
    PID:3884
    • C:\Windows\SysWOW64\schtasks.exe
      /C /create /F /sc minute /mo 1 /tn "Azure-Update-Task" /tr "C:\Users\Admin\AppData\Roaming\Microsoft\Network\sqlcmd.exe"
      2⤵
      • Creates scheduled task(s)
      PID:3564

Network

        MITRE ATT&CK Enterprise v6

        Replay Monitor

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        Downloads

        memory/604-114-0x0000000002680000-0x0000000002713000-memory.dmp

        memory/604-115-0x0000000000400000-0x00000000008E5000-memory.dmp

        memory/3312-128-0x0000000000400000-0x000000000089C000-memory.dmp

        memory/3312-127-0x00000000008B0000-0x00000000008B4000-memory.dmp

        memory/3884-132-0x0000000000400000-0x000000000089C000-memory.dmp