Analysis

  • max time kernel
    135s
  • max time network
    152s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20230220-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20230220-enlocale:en-usos:windows10-2004-x64system
  • submitted
    19/05/2023, 02:59

General

  • Target

    2023-05-18_f57965a7e68277b1d0639d191823c799_wannacry.exe

  • Size

    238KB

  • MD5

    f57965a7e68277b1d0639d191823c799

  • SHA1

    b3dbaa609cbd906d9af248937073ab41f3156d8d

  • SHA256

    13d82229656950d8653f9dbcfba5bb5accdfa2cc051736b882a3becbc9fe9f6b

  • SHA512

    71a33b794a5a0cf83f55d583c7b8c71178c9de0a0b550d8488ccffc1fbd775f1ec71e717d774d730add379603a1c3993cfdbde456d3cb0e271267d2ba5147936

  • SSDEEP

    3072:aoEu+r9EC9z3+wdSe1WcBRjpW5VFMNBDf5qIS/QWqGiUEJhREVUAISsdWBYf7DSM:ar9EChxhdsVFGEeRJk8nrKfQP

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.

  • Modifies boot configuration data using bcdedit 1 TTPs 2 IoCs
  • Renames multiple (196) 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.

  • Modifies extensions of user files 7 IoCs

    Ransomware generally changes the extension on encrypted files.

  • Checks computer location settings 2 TTPs 2 IoCs

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

  • 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) 33 IoCs
  • Sets desktop wallpaper using registry 2 TTPs 1 IoCs
  • Enumerates physical storage devices 1 TTPs

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

  • Checks SCSI registry key(s) 3 TTPs 4 IoCs

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

  • Interacts with shadow copies 2 TTPs 1 IoCs

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

  • Modifies registry class 1 IoCs
  • Opens file in notepad (likely ransom note) 1 IoCs
  • Suspicious behavior: AddClipboardFormatListener 1 IoCs
  • Suspicious behavior: EnumeratesProcesses 51 IoCs
  • Suspicious use of AdjustPrivilegeToken 50 IoCs
  • Suspicious use of WriteProcessMemory 20 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\2023-05-18_f57965a7e68277b1d0639d191823c799_wannacry.exe
    "C:\Users\Admin\AppData\Local\Temp\2023-05-18_f57965a7e68277b1d0639d191823c799_wannacry.exe"
    1⤵
    • Checks computer location settings
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:4172
    • C:\Users\Admin\AppData\Roaming\svchost.exe
      "C:\Users\Admin\AppData\Roaming\svchost.exe"
      2⤵
      • Modifies extensions of user files
      • Checks computer location settings
      • Drops startup file
      • Executes dropped EXE
      • Drops desktop.ini file(s)
      • Sets desktop wallpaper using registry
      • Modifies registry class
      • Suspicious behavior: AddClipboardFormatListener
      • Suspicious behavior: EnumeratesProcesses
      • Suspicious use of AdjustPrivilegeToken
      • Suspicious use of WriteProcessMemory
      PID:3840
      • C:\Windows\System32\cmd.exe
        "C:\Windows\System32\cmd.exe" /C vssadmin delete shadows /all /quiet & wmic shadowcopy delete
        3⤵
        • Suspicious use of WriteProcessMemory
        PID:4776
        • C:\Windows\system32\vssadmin.exe
          vssadmin delete shadows /all /quiet
          4⤵
          • Interacts with shadow copies
          PID:4888
        • C:\Windows\System32\Wbem\WMIC.exe
          wmic shadowcopy delete
          4⤵
          • Suspicious use of AdjustPrivilegeToken
          PID:3716
      • 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:3508
        • C:\Windows\system32\bcdedit.exe
          bcdedit /set {default} bootstatuspolicy ignoreallfailures
          4⤵
          • Modifies boot configuration data using bcdedit
          PID:4156
        • C:\Windows\system32\bcdedit.exe
          bcdedit /set {default} recoveryenabled no
          4⤵
          • Modifies boot configuration data using bcdedit
          PID:1880
      • C:\Windows\System32\cmd.exe
        "C:\Windows\System32\cmd.exe" /C wbadmin delete catalog -quiet
        3⤵
        • Suspicious use of WriteProcessMemory
        PID:3216
        • C:\Windows\system32\wbadmin.exe
          wbadmin delete catalog -quiet
          4⤵
          • Deletes backup catalog
          PID:3300
      • C:\Windows\system32\NOTEPAD.EXE
        "C:\Windows\system32\NOTEPAD.EXE" C:\Users\Admin\AppData\Roaming\read_it.txt
        3⤵
        • Opens file in notepad (likely ransom note)
        PID:1152
  • C:\Windows\system32\vssvc.exe
    C:\Windows\system32\vssvc.exe
    1⤵
    • Suspicious use of AdjustPrivilegeToken
    PID:1396
  • C:\Windows\system32\wbengine.exe
    "C:\Windows\system32\wbengine.exe"
    1⤵
    • Suspicious use of AdjustPrivilegeToken
    PID:2024
  • C:\Windows\System32\vdsldr.exe
    C:\Windows\System32\vdsldr.exe -Embedding
    1⤵
      PID:3848
    • C:\Windows\System32\vds.exe
      C:\Windows\System32\vds.exe
      1⤵
      • Checks SCSI registry key(s)
      PID:4592

    Network

    MITRE ATT&CK Enterprise v6

    Replay Monitor

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    Downloads

    • C:\Users\Admin\AppData\Roaming\read_it.txt

      Filesize

      1KB

      MD5

      13a4a30abd997e23de9a1133ff1a6566

      SHA1

      e113aff829850d03aef07bac26b9bb9591a876d1

      SHA256

      c49fb48169295b6b0ef7f9ac1902d74318ef9388c0cbd68a8d161a4d2131ae5c

      SHA512

      fa4e484e4df2180f512b32ec9c7ca81136257f11ec4eddf6642a1634a6ab9a9281def5e8360fc4d956a1d929d1815ec0887adc5413e35ba001bb2e2ae28122ec

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

      Filesize

      238KB

      MD5

      f57965a7e68277b1d0639d191823c799

      SHA1

      b3dbaa609cbd906d9af248937073ab41f3156d8d

      SHA256

      13d82229656950d8653f9dbcfba5bb5accdfa2cc051736b882a3becbc9fe9f6b

      SHA512

      71a33b794a5a0cf83f55d583c7b8c71178c9de0a0b550d8488ccffc1fbd775f1ec71e717d774d730add379603a1c3993cfdbde456d3cb0e271267d2ba5147936

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

      Filesize

      238KB

      MD5

      f57965a7e68277b1d0639d191823c799

      SHA1

      b3dbaa609cbd906d9af248937073ab41f3156d8d

      SHA256

      13d82229656950d8653f9dbcfba5bb5accdfa2cc051736b882a3becbc9fe9f6b

      SHA512

      71a33b794a5a0cf83f55d583c7b8c71178c9de0a0b550d8488ccffc1fbd775f1ec71e717d774d730add379603a1c3993cfdbde456d3cb0e271267d2ba5147936

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

      Filesize

      238KB

      MD5

      f57965a7e68277b1d0639d191823c799

      SHA1

      b3dbaa609cbd906d9af248937073ab41f3156d8d

      SHA256

      13d82229656950d8653f9dbcfba5bb5accdfa2cc051736b882a3becbc9fe9f6b

      SHA512

      71a33b794a5a0cf83f55d583c7b8c71178c9de0a0b550d8488ccffc1fbd775f1ec71e717d774d730add379603a1c3993cfdbde456d3cb0e271267d2ba5147936

    • C:\Users\Admin\Documents\OneNote Notebooks\My Notebook\read_it.txt

      Filesize

      1KB

      MD5

      13a4a30abd997e23de9a1133ff1a6566

      SHA1

      e113aff829850d03aef07bac26b9bb9591a876d1

      SHA256

      c49fb48169295b6b0ef7f9ac1902d74318ef9388c0cbd68a8d161a4d2131ae5c

      SHA512

      fa4e484e4df2180f512b32ec9c7ca81136257f11ec4eddf6642a1634a6ab9a9281def5e8360fc4d956a1d929d1815ec0887adc5413e35ba001bb2e2ae28122ec

    • memory/4172-133-0x0000000000E00000-0x0000000000E42000-memory.dmp

      Filesize

      264KB