Analysis

  • max time kernel
    150s
  • max time network
    113s
  • platform
    windows10_x64
  • resource
    win10v200722
  • submitted
    20/09/2020, 03:59

General

  • Target
    bd229dbb74bdb0ff7b1fcd5946fbf9ab.exe
  • Size 1.1MB
  • Sample200920-2fbv8a4h12
  • SHA256 cc487ddc590416f6a94cc808247bbdeaf25b35cf01c41f5be2024049d7e2f61d
  • MD5 SHA1 SHA512

Malware Config

Extracted

Path
  • C:\Users\Admin\AppData\Local\94A4C56A47\Log.txt

  • masslogger

Ransom Note
  • <|| v2.1.0.0 ||> User Name: Admin IP: 154.61.71.13 Location: United States Windows OS: Microsoft Windows 10 Pro 64bit Windows Serial Key: W269N-WFGWX-YVC9B-4J6C9-T83GX CPU: Persocon Processor 2.5+ GPU: Microsoft Basic Display Adapter AV: NA Screen Resolution: 1280x720 Current Time: 9/20/2020 6:02:58 AM MassLogger Started: 9/20/2020 6:02:53 AM Interval: 2 hour MassLogger Process: C:\Users\Admin\AppData\Roaming\appdata\bjsbjsf.exe MassLogger Melt: false MassLogger Exit after delivery: false As Administrator: True Processes: <|| WD Exclusion ||> Disabled <|| Binder ||> Disabled <|| USB Spread ||> Disabled <|| Downloader ||> Disabled <|| Window Searcher ||> Disabled <|| Bot Killer ||> Disabled <|| Search And Upload ||> Disabled <|| Telegram Desktop ||> Not Installed <|| Pidgin ||> Not Installed <|| FileZilla ||> Not Installed <|| Discord Tokken ||> Not Installed <|| NordVPN ||> Not Installed <|| Outlook ||> Not Installed <|| FoxMail ||> Not Installed <|| Thunderbird ||> Not Installed <|| FireFox ||> Not Found <|| QQ Browser ||> Not Installed <|| Chromium Recovery ||> Not Installed or Not Found <|| Keylogger And Clipboard ||> NA

Signatures

  • MassLogger

    Masslogger is a .NET stealer targeting passwords from browsers, email and cryptocurrency clients.

  • MassLogger log file 1 IoCs

    Detects a log file produced by MassLogger.

  • Executes dropped EXE 3 IoCs
  • UPX packed file 6 IoCs

    Detects executables packed with UPX/modified UPX open source packer.

  • Checks computer location settings 2 TTPs 1 IoCs

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

  • Drops startup file 1 IoCs
  • Reads user/profile data of web browsers 2 TTPs

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

  • Looks up external IP address via web service 1 IoCs

    Uses a legitimate IP lookup service to find the infected system's external IP.

  • Suspicious use of SetThreadContext 1 IoCs
  • NTFS ADS 1 IoCs
  • Suspicious behavior: AddClipboardFormatListener 1 IoCs
  • Suspicious behavior: EnumeratesProcesses 2598 IoCs
  • Suspicious behavior: MapViewOfSection 1 IoCs
  • Suspicious use of AdjustPrivilegeToken 1 IoCs
  • Suspicious use of SetWindowsHookEx 1 IoCs
  • Suspicious use of WriteProcessMemory 14 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\bd229dbb74bdb0ff7b1fcd5946fbf9ab.exe
    "C:\Users\Admin\AppData\Local\Temp\bd229dbb74bdb0ff7b1fcd5946fbf9ab.exe"
    1⤵
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious use of WriteProcessMemory
    PID:3824
    • C:\Windows\SysWOW64\notepad.exe
      "C:\Windows\system32\notepad.exe"
      2⤵
      • Drops startup file
      • NTFS ADS
      • Suspicious use of WriteProcessMemory
      PID:2444
      • C:\Users\Admin\AppData\Roaming\appdata\bjsbjsf.exe
        "C:\Users\Admin\AppData\Roaming\appdata\bjsbjsf.exe"
        3⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious behavior: EnumeratesProcesses
        • Suspicious behavior: MapViewOfSection
        • Suspicious use of WriteProcessMemory
        PID:2676
        • C:\Users\Admin\AppData\Roaming\appdata\bjsbjsf.exe
          "C:\Users\Admin\AppData\Roaming\appdata\bjsbjsf.exe"
          4⤵
          • Executes dropped EXE
          • Checks computer location settings
          • Suspicious behavior: AddClipboardFormatListener
          • Suspicious use of AdjustPrivilegeToken
          • Suspicious use of SetWindowsHookEx
          PID:3100
        • C:\Users\Admin\AppData\Roaming\appdata\bjsbjsf.exe
          "C:\Users\Admin\AppData\Roaming\appdata\bjsbjsf.exe" 2 3100 259306828
          4⤵
          • Executes dropped EXE
          • Suspicious behavior: EnumeratesProcesses
          PID:3636

Network

        MITRE ATT&CK Enterprise v6

        Replay Monitor

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        Downloads

        memory/2676-5-0x0000000000400000-0x0000000000517000-memory.dmp

        memory/3100-6-0x0000000000400000-0x0000000000541000-memory.dmp

        memory/3100-22-0x00000000049F0000-0x00000000049F1000-memory.dmp

        memory/3100-26-0x0000000006480000-0x000000000648F000-memory.dmp

        memory/3100-10-0x0000000000400000-0x0000000000541000-memory.dmp

        memory/3100-11-0x0000000000400000-0x0000000000541000-memory.dmp

        memory/3100-25-0x0000000007830000-0x0000000007831000-memory.dmp

        memory/3100-13-0x0000000002310000-0x00000000023AA000-memory.dmp

        memory/3100-14-0x00000000023F2000-0x00000000023F3000-memory.dmp

        memory/3100-24-0x00000000065E0000-0x00000000065E1000-memory.dmp

        memory/3100-16-0x0000000073230000-0x000000007391E000-memory.dmp

        memory/3100-19-0x0000000004B30000-0x0000000004B31000-memory.dmp

        memory/3100-20-0x0000000002500000-0x0000000002501000-memory.dmp

        memory/3100-21-0x00000000023B0000-0x00000000023EE000-memory.dmp

        memory/3100-23-0x0000000005330000-0x0000000005331000-memory.dmp

        memory/3636-15-0x0000000000400000-0x0000000000517000-memory.dmp

        memory/3824-0-0x0000000000400000-0x0000000000517000-memory.dmp