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Resubmissions

31/03/2024, 09:16

240331-k8y2eahd2s 10

31/03/2024, 09:07

240331-k3d42shh42 10

20/03/2024, 19:30

240320-x7y18shg5v 10

Analysis

  • max time kernel
    122s
  • max time network
    126s
  • platform
    windows7_x64
  • resource
    win7-20240221-en
  • resource tags

    arch:x64arch:x86image:win7-20240221-enlocale:en-usos:windows7-x64system
  • submitted
    20/03/2024, 19:30

General

  • Target

    2024-03-20_1b2fdf47aaaccaf622e33cb4dd63e8e2_wannacry.exe

  • Size

    372KB

  • MD5

    1b2fdf47aaaccaf622e33cb4dd63e8e2

  • SHA1

    1130c9d40bc5ab004918a509811f914605594961

  • SHA256

    24266d8af5e54a179ca62fe8ba586a9bced5e39565ad05f33583a3fc8f509613

  • SHA512

    f494e23997ba85df3fcdaaaeb1d6c056de6f7b6a22ecf8df4797b302016deafea0d2030058680baa521cae93cf5921b3bd58d1750274819f866a868beff2739c

  • SSDEEP

    3072:doeNsCr9h4ca2aHBSCAb2+IPdG1UlcaVSptR4jiYFD:nNr9h4ca7SCdI12cTtRcf

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 (199) 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.

  • 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) 34 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).

  • 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: AddClipboardFormatListener 1 IoCs
  • Suspicious behavior: EnumeratesProcesses 6 IoCs
  • Suspicious use of AdjustPrivilegeToken 48 IoCs
  • Suspicious use of WriteProcessMemory 30 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\2024-03-20_1b2fdf47aaaccaf622e33cb4dd63e8e2_wannacry.exe
    "C:\Users\Admin\AppData\Local\Temp\2024-03-20_1b2fdf47aaaccaf622e33cb4dd63e8e2_wannacry.exe"
    1⤵
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:2240
    • 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)
      • Sets desktop wallpaper using registry
      • Suspicious behavior: AddClipboardFormatListener
      • Suspicious behavior: EnumeratesProcesses
      • Suspicious use of AdjustPrivilegeToken
      • Suspicious use of WriteProcessMemory
      PID:1956
      • 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:2500
        • C:\Windows\system32\vssadmin.exe
          vssadmin delete shadows /all /quiet
          4⤵
          • Interacts with shadow copies
          PID:2736
        • C:\Windows\System32\Wbem\WMIC.exe
          wmic shadowcopy delete
          4⤵
          • Suspicious use of AdjustPrivilegeToken
          PID:1080
      • 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:1780
        • C:\Windows\system32\bcdedit.exe
          bcdedit /set {default} bootstatuspolicy ignoreallfailures
          4⤵
          • Modifies boot configuration data using bcdedit
          PID:1848
        • C:\Windows\system32\bcdedit.exe
          bcdedit /set {default} recoveryenabled no
          4⤵
          • Modifies boot configuration data using bcdedit
          PID:3060
      • C:\Windows\System32\cmd.exe
        "C:\Windows\System32\cmd.exe" /C wbadmin delete catalog -quiet
        3⤵
        • Suspicious use of WriteProcessMemory
        PID:2812
        • C:\Windows\system32\wbadmin.exe
          wbadmin delete catalog -quiet
          4⤵
          • Deletes backup catalog
          PID:2264
      • C:\Windows\system32\NOTEPAD.EXE
        "C:\Windows\system32\NOTEPAD.EXE" C:\Users\Admin\AppData\Roaming\meleaicara.txt
        3⤵
        • Opens file in notepad (likely ransom note)
        PID:2040
  • C:\Windows\system32\vssvc.exe
    C:\Windows\system32\vssvc.exe
    1⤵
    • Suspicious use of AdjustPrivilegeToken
    PID:2644
  • C:\Windows\system32\wbengine.exe
    "C:\Windows\system32\wbengine.exe"
    1⤵
    • Suspicious use of AdjustPrivilegeToken
    PID:2716
  • C:\Windows\System32\vdsldr.exe
    C:\Windows\System32\vdsldr.exe -Embedding
    1⤵
      PID:1984
    • C:\Windows\System32\vds.exe
      C:\Windows\System32\vds.exe
      1⤵
        PID:1084

      Network

      MITRE ATT&CK Enterprise v15

      Replay Monitor

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      Downloads

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

        Filesize

        372KB

        MD5

        1b2fdf47aaaccaf622e33cb4dd63e8e2

        SHA1

        1130c9d40bc5ab004918a509811f914605594961

        SHA256

        24266d8af5e54a179ca62fe8ba586a9bced5e39565ad05f33583a3fc8f509613

        SHA512

        f494e23997ba85df3fcdaaaeb1d6c056de6f7b6a22ecf8df4797b302016deafea0d2030058680baa521cae93cf5921b3bd58d1750274819f866a868beff2739c

      • C:\Users\Admin\Documents\meleaicara.txt

        Filesize

        337B

        MD5

        2453eac3dfe17fe5b3e88b03f449d805

        SHA1

        24c16cbbf4f2b8ea43d1cbea09a51eaa2c0d6b13

        SHA256

        2464de8fc12e32477f09621b90d707ab9fcca3b9d8b1b1caf367f5496021091f

        SHA512

        d5750b142533e1fab2deaae7563edb7da723ef69cc93f91c1e91659da92167d9f9d0b34a7ed828761563068a510857f62d893c0028cc826f3252fc993c420a0a

      • memory/1956-7-0x00000000012B0000-0x0000000001312000-memory.dmp

        Filesize

        392KB

      • memory/1956-9-0x000007FEF5700000-0x000007FEF60EC000-memory.dmp

        Filesize

        9.9MB

      • memory/1956-11-0x0000000000AF0000-0x0000000000B70000-memory.dmp

        Filesize

        512KB

      • memory/1956-458-0x000007FEF5700000-0x000007FEF60EC000-memory.dmp

        Filesize

        9.9MB

      • memory/2240-0-0x00000000003A0000-0x0000000000402000-memory.dmp

        Filesize

        392KB

      • memory/2240-1-0x000007FEF5700000-0x000007FEF60EC000-memory.dmp

        Filesize

        9.9MB

      • memory/2240-8-0x000007FEF5700000-0x000007FEF60EC000-memory.dmp

        Filesize

        9.9MB