Resubmissions

18-04-2024 16:18

240418-tr7fwsae6x 10

13-04-2024 06:33

240413-hbqbwseg9z 10

12-04-2024 09:47

240412-lr6klacd6s 10

Analysis

  • max time kernel
    119s
  • max time network
    117s
  • platform
    windows7_x64
  • resource
    win7-20240215-en
  • resource tags

    arch:x64arch:x86image:win7-20240215-enlocale:en-usos:windows7-x64system
  • submitted
    18-04-2024 16:18

General

  • Target

    Antivirus.exe

  • Size

    111KB

  • MD5

    df1ce61fb4869963a1e95a917adef9d0

  • SHA1

    bcf132651a5bd948e758441e4733519d1502c8bf

  • SHA256

    e58bf0a81866c21e25dbe8f85fd74304259be3e1b53019f857c2354e23f71b1e

  • SHA512

    d2867e1b00900098674f1a87653a9f016911649162c66f0eab67336f758a6611a497bc21a6cbe336bbc2464212bfec59e991b99aa92777ad2250e72b4e17888b

  • SSDEEP

    3072:CB7q9NKEXUrQlGRSAMHsEwGYMl9AYGywOjvOjJ:CB7q9CQ8hMs7GpKPOaj

Malware Config

Signatures

  • Chaos

    Ransomware family first seen in June 2021.

  • Chaos Ransomware 3 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 (187) 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 2 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.

  • Adds Run key to start application 2 TTPs 1 IoCs
  • Drops desktop.ini file(s) 64 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.

  • Modifies registry class 8 IoCs
  • Opens file in notepad (likely ransom note) 1 IoCs
  • Suspicious behavior: AddClipboardFormatListener 2 IoCs
  • Suspicious behavior: EnumeratesProcesses 5 IoCs
  • Suspicious behavior: GetForegroundWindowSpam 1 IoCs
  • Suspicious use of AdjustPrivilegeToken 52 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\Antivirus.exe
    "C:\Users\Admin\AppData\Local\Temp\Antivirus.exe"
    1⤵
    • Suspicious behavior: AddClipboardFormatListener
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:3028
    • C:\Users\Admin\AppData\Roaming\svchost.exe
      "C:\Users\Admin\AppData\Roaming\svchost.exe"
      2⤵
      • Drops startup file
      • Executes dropped EXE
      • Adds Run key to start application
      • 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:2852
      • 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:2676
        • C:\Windows\system32\vssadmin.exe
          vssadmin delete shadows /all /quiet
          4⤵
          • Interacts with shadow copies
          PID:2608
        • C:\Windows\System32\Wbem\WMIC.exe
          wmic shadowcopy delete
          4⤵
          • Suspicious use of AdjustPrivilegeToken
          PID:2956
      • 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:2820
        • C:\Windows\system32\bcdedit.exe
          bcdedit /set {default} bootstatuspolicy ignoreallfailures
          4⤵
          • Modifies boot configuration data using bcdedit
          PID:2920
        • C:\Windows\system32\bcdedit.exe
          bcdedit /set {default} recoveryenabled no
          4⤵
          • Modifies boot configuration data using bcdedit
          PID:2980
      • C:\Windows\System32\cmd.exe
        "C:\Windows\System32\cmd.exe" /C wbadmin delete catalog -quiet
        3⤵
        • Suspicious use of WriteProcessMemory
        PID:2936
        • C:\Windows\system32\wbadmin.exe
          wbadmin delete catalog -quiet
          4⤵
          • Deletes backup catalog
          PID:2764
      • C:\Windows\system32\NOTEPAD.EXE
        "C:\Windows\system32\NOTEPAD.EXE" C:\Users\Admin\AppData\Roaming\hehehe.txt
        3⤵
        • Opens file in notepad (likely ransom note)
        PID:1548
  • C:\Windows\system32\vssvc.exe
    C:\Windows\system32\vssvc.exe
    1⤵
    • Suspicious use of AdjustPrivilegeToken
    PID:2060
  • C:\Windows\system32\wbengine.exe
    "C:\Windows\system32\wbengine.exe"
    1⤵
    • Suspicious use of AdjustPrivilegeToken
    PID:2428
  • C:\Windows\System32\vdsldr.exe
    C:\Windows\System32\vdsldr.exe -Embedding
    1⤵
      PID:2760
    • C:\Windows\System32\vds.exe
      C:\Windows\System32\vds.exe
      1⤵
        PID:1988
      • C:\Program Files\Microsoft Games\solitaire\solitaire.exe
        "C:\Program Files\Microsoft Games\solitaire\solitaire.exe"
        1⤵
        • Modifies registry class
        • Suspicious behavior: GetForegroundWindowSpam
        PID:3000
      • C:\Windows\system32\AUDIODG.EXE
        C:\Windows\system32\AUDIODG.EXE 0x580
        1⤵
        • Suspicious use of AdjustPrivilegeToken
        PID:2340

      Network

      MITRE ATT&CK Enterprise v15

      Replay Monitor

      Loading Replay Monitor...

      Downloads

      • C:\Users\Admin\AppData\Local\hehehe.txt

        Filesize

        52B

        MD5

        f8f5b009780aaaed87e3da3eac18755f

        SHA1

        1139582169a36844b8a637bdff2c99e5e187f779

        SHA256

        f0b0870127af4f58da5dbc9c87bb5f63284c56d471647437dabff5bd051217c7

        SHA512

        355107f39f82d6f01aeba045b74bb37716374ba710e0f895b5a98a531a8133b601aba830dbfbf3650495b8780455c6933cc0502c3832733e2005f298b51bd7af

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

        Filesize

        111KB

        MD5

        df1ce61fb4869963a1e95a917adef9d0

        SHA1

        bcf132651a5bd948e758441e4733519d1502c8bf

        SHA256

        e58bf0a81866c21e25dbe8f85fd74304259be3e1b53019f857c2354e23f71b1e

        SHA512

        d2867e1b00900098674f1a87653a9f016911649162c66f0eab67336f758a6611a497bc21a6cbe336bbc2464212bfec59e991b99aa92777ad2250e72b4e17888b

      • C:\Users\Default\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Accessories\Notepad.lnk

        Filesize

        1B

        MD5

        d1457b72c3fb323a2671125aef3eab5d

        SHA1

        5bab61eb53176449e25c2c82f172b82cb13ffb9d

        SHA256

        8a8de823d5ed3e12746a62ef169bcf372be0ca44f0a1236abc35df05d96928e1

        SHA512

        ca63c07ad35d8c9fb0c92d6146759b122d4ec5d3f67ebe2f30ddb69f9e6c9fd3bf31a5e408b08f1d4d9cd68120cced9e57f010bef3cde97653fed5470da7d1a0

      • memory/2852-948-0x0000000000B90000-0x0000000000C10000-memory.dmp

        Filesize

        512KB

      • memory/2852-947-0x000007FEF5CE0000-0x000007FEF66CC000-memory.dmp

        Filesize

        9.9MB

      • memory/2852-8-0x0000000000EE0000-0x0000000000F02000-memory.dmp

        Filesize

        136KB

      • memory/2852-10-0x000007FEF5CE0000-0x000007FEF66CC000-memory.dmp

        Filesize

        9.9MB

      • memory/2852-11-0x0000000000B90000-0x0000000000C10000-memory.dmp

        Filesize

        512KB

      • memory/3000-956-0x0000000002020000-0x0000000002021000-memory.dmp

        Filesize

        4KB

      • memory/3000-961-0x0000000002030000-0x000000000203A000-memory.dmp

        Filesize

        40KB

      • memory/3000-996-0x0000000000330000-0x0000000000430000-memory.dmp

        Filesize

        1024KB

      • memory/3000-995-0x0000000006C20000-0x0000000007020000-memory.dmp

        Filesize

        4.0MB

      • memory/3000-949-0x0000000002020000-0x0000000002021000-memory.dmp

        Filesize

        4KB

      • memory/3000-950-0x0000000002030000-0x000000000203A000-memory.dmp

        Filesize

        40KB

      • memory/3000-954-0x0000000002030000-0x000000000203A000-memory.dmp

        Filesize

        40KB

      • memory/3000-953-0x0000000002030000-0x000000000203A000-memory.dmp

        Filesize

        40KB

      • memory/3000-952-0x0000000002030000-0x000000000203A000-memory.dmp

        Filesize

        40KB

      • memory/3000-951-0x0000000002030000-0x000000000203A000-memory.dmp

        Filesize

        40KB

      • memory/3000-994-0x000007FEEEB00000-0x000007FEEEC31000-memory.dmp

        Filesize

        1.2MB

      • memory/3000-957-0x0000000002030000-0x000000000203A000-memory.dmp

        Filesize

        40KB

      • memory/3000-958-0x0000000002030000-0x000000000203A000-memory.dmp

        Filesize

        40KB

      • memory/3000-959-0x0000000002030000-0x000000000203A000-memory.dmp

        Filesize

        40KB

      • memory/3000-960-0x0000000002030000-0x000000000203A000-memory.dmp

        Filesize

        40KB

      • memory/3000-992-0x0000000002070000-0x000000000207A000-memory.dmp

        Filesize

        40KB

      • memory/3000-962-0x0000000002030000-0x000000000203A000-memory.dmp

        Filesize

        40KB

      • memory/3000-964-0x0000000002070000-0x000000000207A000-memory.dmp

        Filesize

        40KB

      • memory/3000-965-0x0000000002070000-0x000000000207A000-memory.dmp

        Filesize

        40KB

      • memory/3000-967-0x0000000002070000-0x000000000207A000-memory.dmp

        Filesize

        40KB

      • memory/3000-984-0x000007FEEEB00000-0x000007FEEEC31000-memory.dmp

        Filesize

        1.2MB

      • memory/3000-988-0x0000000006C20000-0x0000000007020000-memory.dmp

        Filesize

        4.0MB

      • memory/3000-989-0x0000000000330000-0x0000000000430000-memory.dmp

        Filesize

        1024KB

      • memory/3000-990-0x0000000000330000-0x0000000000430000-memory.dmp

        Filesize

        1024KB

      • memory/3000-991-0x0000000002070000-0x000000000207A000-memory.dmp

        Filesize

        40KB

      • memory/3000-993-0x0000000002070000-0x000000000207A000-memory.dmp

        Filesize

        40KB

      • memory/3028-9-0x000007FEF5CE0000-0x000007FEF66CC000-memory.dmp

        Filesize

        9.9MB

      • memory/3028-0-0x0000000000350000-0x0000000000372000-memory.dmp

        Filesize

        136KB

      • memory/3028-1-0x000007FEF5CE0000-0x000007FEF66CC000-memory.dmp

        Filesize

        9.9MB

      • memory/3028-2-0x000000001AB30000-0x000000001ABB0000-memory.dmp

        Filesize

        512KB