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Analysis

  • max time kernel
    131s
  • max time network
    141s
  • platform
    windows7_x64
  • resource
    win7-20240508-en
  • resource tags

    arch:x64arch:x86image:win7-20240508-enlocale:en-usos:windows7-x64system
  • submitted
    18-06-2024 13:45

General

  • Target

    Documents/Ransomware.Cryptowall/cryptowall.exe

  • Size

    240KB

  • MD5

    47363b94cee907e2b8926c1be61150c7

  • SHA1

    ca963033b9a285b8cd0044df38146a932c838071

  • SHA256

    45317968759d3e37282ceb75149f627d648534c5b4685f6da3966d8f6fca662d

  • SHA512

    93dfaafc183360829448887a112dd49c90ec5fe50dcd7c7bbc06c1c8daa206eeea5577f726d906446322c731d0520e93700d5ff9cefd730fba347c72b7325068

  • SSDEEP

    3072:xkeyloECBch6ZCGBGSmHJ0y5lj6jdojK7+MGOXpXx8z3Lp7Yoq:xGlnCIwMpj6ijKfxx8z3F0V

Malware Config

Signatures

  • Deletes shadow copies 3 TTPs

    Ransomware often targets backup files to inhibit system recovery.

  • Drops startup file 1 IoCs
  • Adds Run key to start application 2 TTPs 4 IoCs
  • Looks up external IP address via web service 2 IoCs

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

  • Suspicious use of SetThreadContext 1 IoCs
  • Interacts with shadow copies 3 TTPs 1 IoCs

    Shadow copies are often targeted by ransomware to inhibit system recovery.

  • Suspicious behavior: EnumeratesProcesses 2 IoCs
  • Suspicious behavior: MapViewOfSection 2 IoCs
  • Suspicious use of AdjustPrivilegeToken 5 IoCs
  • Suspicious use of WriteProcessMemory 22 IoCs
  • Uses Volume Shadow Copy service COM API

    The Volume Shadow Copy service is used to manage backups/snapshots.

Processes

  • C:\Users\Admin\AppData\Local\Temp\Documents\Ransomware.Cryptowall\cryptowall.exe
    "C:\Users\Admin\AppData\Local\Temp\Documents\Ransomware.Cryptowall\cryptowall.exe"
    1⤵
    • Suspicious use of SetThreadContext
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:1192
    • C:\Users\Admin\AppData\Local\Temp\Documents\Ransomware.Cryptowall\cryptowall.exe
      "C:\Users\Admin\AppData\Local\Temp\Documents\Ransomware.Cryptowall\cryptowall.exe"
      2⤵
      • Suspicious behavior: MapViewOfSection
      • Suspicious use of WriteProcessMemory
      PID:1244
      • C:\Windows\syswow64\explorer.exe
        "C:\Windows\syswow64\explorer.exe"
        3⤵
        • Drops startup file
        • Adds Run key to start application
        • Suspicious behavior: MapViewOfSection
        • Suspicious use of WriteProcessMemory
        PID:1220
        • C:\Windows\syswow64\svchost.exe
          -k netsvcs
          4⤵
            PID:2972
          • C:\Windows\syswow64\vssadmin.exe
            vssadmin.exe Delete Shadows /All /Quiet
            4⤵
            • Interacts with shadow copies
            PID:2968
    • C:\Windows\system32\vssvc.exe
      C:\Windows\system32\vssvc.exe
      1⤵
      • Suspicious use of AdjustPrivilegeToken
      PID:2504

    Network

    MITRE ATT&CK Enterprise v15

    Replay Monitor

    Loading Replay Monitor...

    Downloads

    • memory/1192-0-0x0000000000240000-0x0000000000256000-memory.dmp

      Filesize

      88KB

    • memory/1220-22-0x0000000000330000-0x0000000000355000-memory.dmp

      Filesize

      148KB

    • memory/1220-15-0x0000000000330000-0x0000000000355000-memory.dmp

      Filesize

      148KB

    • memory/1244-3-0x0000000000400000-0x0000000000425000-memory.dmp

      Filesize

      148KB

    • memory/1244-7-0x0000000000400000-0x0000000000425000-memory.dmp

      Filesize

      148KB

    • memory/1244-5-0x0000000000400000-0x0000000000425000-memory.dmp

      Filesize

      148KB

    • memory/1244-9-0x0000000000400000-0x0000000000425000-memory.dmp

      Filesize

      148KB

    • memory/1244-1-0x0000000000400000-0x0000000000425000-memory.dmp

      Filesize

      148KB

    • memory/1244-11-0x000000007EFDE000-0x000000007EFDF000-memory.dmp

      Filesize

      4KB

    • memory/1244-16-0x0000000000400000-0x0000000000425000-memory.dmp

      Filesize

      148KB

    • memory/1244-14-0x0000000000400000-0x0000000000425000-memory.dmp

      Filesize

      148KB

    • memory/1244-13-0x0000000000400000-0x0000000000425000-memory.dmp

      Filesize

      148KB

    • memory/2972-21-0x00000000000C0000-0x00000000000E5000-memory.dmp

      Filesize

      148KB