Analysis

  • max time kernel
    18s
  • max time network
    122s
  • platform
    windows7_x64
  • resource
    win7-20231215-en
  • resource tags

    arch:x64arch:x86image:win7-20231215-enlocale:en-usos:windows7-x64system
  • submitted
    06-02-2024 02:46

General

  • Target

    2024-02-06_b339405d60e7219f6d2313c712a43b98_wannacry.exe

  • Size

    279KB

  • MD5

    b339405d60e7219f6d2313c712a43b98

  • SHA1

    448869cec847c2348093340691ffbc91c43f9924

  • SHA256

    893415f77589706593c2ce3cd6f388b0fe035e32cb39d4e1e1a81cea167386a0

  • SHA512

    13dfb12dc92d361c3513452887a375f8ba5a73b65611501ac27936cdf6446c4bb9a2e259bfa6b576fc13ba72d57c755762586ec18631329f879fedd5c41cd461

  • SSDEEP

    6144:Oc95/KFl0f3OZ9JWAsPb6CvVNbGRUly3RPdIg:j/KFl0f3OZ9kAsD6CdNbGRU43RPdI

Malware Config

Signatures

  • Chaos

    Ransomware family first seen in June 2021.

  • Chaos Ransomware 4 IoCs
  • Deletes shadow copies 2 TTPs

    Ransomware often targets backup files to inhibit system recovery.

  • Detects command variations typically used by ransomware 4 IoCs
  • Modifies boot configuration data using bcdedit 1 TTPs 2 IoCs
  • Renames multiple (175) files with added filename extension

    This suggests ransomware activity of encrypting all the files on the system.

  • Deletes backup catalog 3 TTPs 1 IoCs

    Uses wbadmin.exe to inhibit system recovery.

  • Disables Task Manager via registry modification
  • Drops startup file 3 IoCs
  • Executes dropped EXE 1 IoCs
  • Reads user/profile data of web browsers 2 TTPs

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

  • Drops desktop.ini file(s) 64 IoCs
  • Enumerates physical storage devices 1 TTPs

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

  • Interacts with shadow copies 2 TTPs 1 IoCs

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

  • Opens file in notepad (likely ransom note) 1 IoCs
  • Suspicious behavior: EnumeratesProcesses 8 IoCs
  • Suspicious use of AdjustPrivilegeToken 48 IoCs
  • Suspicious use of WriteProcessMemory 27 IoCs
  • Uses Task Scheduler COM API 1 TTPs

    The Task Scheduler COM API can be used to schedule applications to run on boot or at set times.

  • 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\2024-02-06_b339405d60e7219f6d2313c712a43b98_wannacry.exe
    "C:\Users\Admin\AppData\Local\Temp\2024-02-06_b339405d60e7219f6d2313c712a43b98_wannacry.exe"
    1⤵
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:2152
    • C:\Users\Admin\AppData\Roaming\svchost.exe
      "C:\Users\Admin\AppData\Roaming\svchost.exe"
      2⤵
      • Drops startup file
      • Executes dropped EXE
      • Drops desktop.ini file(s)
      • Suspicious behavior: EnumeratesProcesses
      • Suspicious use of AdjustPrivilegeToken
      • Suspicious use of WriteProcessMemory
      PID:1688
      • C:\Windows\System32\cmd.exe
        "C:\Windows\System32\cmd.exe" /C wbadmin delete catalog -quiet
        3⤵
        • Suspicious use of WriteProcessMemory
        PID:2924
        • C:\Windows\system32\wbadmin.exe
          wbadmin delete catalog -quiet
          4⤵
          • Deletes backup catalog
          PID:3040
      • C:\Windows\System32\cmd.exe
        "C:\Windows\System32\cmd.exe" /C bcdedit /set {default} bootstatuspolicy ignoreallfailures & bcdedit /set {default} recoveryenabled no
        3⤵
        • Suspicious use of WriteProcessMemory
        PID:2900
      • C:\Windows\system32\NOTEPAD.EXE
        "C:\Windows\system32\NOTEPAD.EXE" C:\Users\Admin\AppData\Roaming\Open.txt
        3⤵
        • Opens file in notepad (likely ransom note)
        PID:2940
  • C:\Windows\System32\cmd.exe
    "C:\Windows\System32\cmd.exe" /C vssadmin delete shadows /all /quiet & wmic shadowcopy delete
    1⤵
    • Suspicious use of WriteProcessMemory
    PID:2972
    • C:\Windows\system32\vssadmin.exe
      vssadmin delete shadows /all /quiet
      2⤵
      • Interacts with shadow copies
      PID:2960
    • C:\Windows\System32\Wbem\WMIC.exe
      wmic shadowcopy delete
      2⤵
      • Suspicious use of AdjustPrivilegeToken
      PID:2376
  • C:\Windows\system32\vssvc.exe
    C:\Windows\system32\vssvc.exe
    1⤵
    • Suspicious use of AdjustPrivilegeToken
    PID:2752
  • C:\Windows\system32\bcdedit.exe
    bcdedit /set {default} recoveryenabled no
    1⤵
    • Modifies boot configuration data using bcdedit
    PID:2916
  • C:\Windows\system32\bcdedit.exe
    bcdedit /set {default} bootstatuspolicy ignoreallfailures
    1⤵
    • Modifies boot configuration data using bcdedit
    PID:2904
  • C:\Windows\system32\wbengine.exe
    "C:\Windows\system32\wbengine.exe"
    1⤵
    • Suspicious use of AdjustPrivilegeToken
    PID:2036
  • C:\Windows\System32\vdsldr.exe
    C:\Windows\System32\vdsldr.exe -Embedding
    1⤵
      PID:2232
    • C:\Windows\System32\vds.exe
      C:\Windows\System32\vds.exe
      1⤵
        PID:2508

      Network

      MITRE ATT&CK Enterprise v15

      Replay Monitor

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      Downloads

      • C:\Users\Admin\AppData\Local\Google\Chrome\User Data\Crashpad\Open.txt

        Filesize

        1KB

        MD5

        a4e0df828e30dcdbffb01710a73949fb

        SHA1

        6db94686c50fde57e7c5cf188034883b95006770

        SHA256

        56ce87b571f67cd9e21e4c0045a4b4bb2889dac8c05a5fed6f38f1fe3fcc12dc

        SHA512

        b410941f284b4e2fde82a19edf3ca3dbd3ec5965c1cf7952bdacc6b5492a4913ea6eb257c7cbfbf6a7a9bee49b94204299fb0a350f6c6ef8ad5ea2025149c82c

      • C:\Users\Admin\AppData\Roaming\LimitRequest.jpg

        Filesize

        1B

        MD5

        d1457b72c3fb323a2671125aef3eab5d

        SHA1

        5bab61eb53176449e25c2c82f172b82cb13ffb9d

        SHA256

        8a8de823d5ed3e12746a62ef169bcf372be0ca44f0a1236abc35df05d96928e1

        SHA512

        ca63c07ad35d8c9fb0c92d6146759b122d4ec5d3f67ebe2f30ddb69f9e6c9fd3bf31a5e408b08f1d4d9cd68120cced9e57f010bef3cde97653fed5470da7d1a0

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

        Filesize

        154KB

        MD5

        ee5eea609ea8c28ba06ceddf6aa54e81

        SHA1

        5bb892576745266e9a20128a7f5492e10501576f

        SHA256

        fdd89ab74613941869b602197464944c0d294cfe611b56cae8dba6952cbe630d

        SHA512

        4ab8e56c6fd65d3234db80384937bfb2bade63fcc33a1c3c63590df4e777f125070b506ea484aac4ff78ebe5ba2529e724d0d76c909bd25a8d87a52c1d7de715

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

        Filesize

        231KB

        MD5

        3bc962f449d5a8dc67f322e6ff6aa99b

        SHA1

        a38f7472892dbbfcd95f463ac1aac9f5c18ec446

        SHA256

        4d665cbc7d64e542d35954bf2b379e5bf193d78d933f05ea7827988cfce93f56

        SHA512

        8df22a77690c9b391bf192efe59e2fbe558c033d81f6e10f9f428cece204f11ae9b20e642c6f9deeed91d43599b70f8b44229e7d1fa03d955b52c7679c9bf672

      • memory/1688-7-0x00000000000B0000-0x00000000000FC000-memory.dmp

        Filesize

        304KB

      • memory/1688-9-0x000007FEF5B30000-0x000007FEF651C000-memory.dmp

        Filesize

        9.9MB

      • memory/1688-59-0x000000001AFE0000-0x000000001B060000-memory.dmp

        Filesize

        512KB

      • memory/1688-890-0x000007FEF5B30000-0x000007FEF651C000-memory.dmp

        Filesize

        9.9MB

      • memory/1688-891-0x000000001AFE0000-0x000000001B060000-memory.dmp

        Filesize

        512KB

      • memory/2152-0-0x0000000000FE0000-0x000000000102C000-memory.dmp

        Filesize

        304KB

      • memory/2152-1-0x000007FEF5B30000-0x000007FEF651C000-memory.dmp

        Filesize

        9.9MB

      • memory/2152-8-0x000007FEF5B30000-0x000007FEF651C000-memory.dmp

        Filesize

        9.9MB