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
    91s
  • max time network
    124s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20240412-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20240412-enlocale:en-usos:windows10-2004-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 2 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 (181) 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
  • Checks computer location settings 2 TTPs 2 IoCs

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

  • 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).

  • 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 2 IoCs
  • Suspicious behavior: EnumeratesProcesses 44 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\Antivirus.exe
    "C:\Users\Admin\AppData\Local\Temp\Antivirus.exe"
    1⤵
    • Checks computer location settings
    • Suspicious behavior: AddClipboardFormatListener
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:5064
    • C:\Users\Admin\AppData\Roaming\svchost.exe
      "C:\Users\Admin\AppData\Roaming\svchost.exe"
      2⤵
      • Checks computer location settings
      • Drops startup file
      • Executes dropped EXE
      • Adds Run key to start application
      • 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:4504
      • 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:1268
        • C:\Windows\system32\vssadmin.exe
          vssadmin delete shadows /all /quiet
          4⤵
          • Interacts with shadow copies
          PID:2492
        • C:\Windows\System32\Wbem\WMIC.exe
          wmic shadowcopy delete
          4⤵
          • Suspicious use of AdjustPrivilegeToken
          PID:3816
      • 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:4044
        • C:\Windows\system32\bcdedit.exe
          bcdedit /set {default} bootstatuspolicy ignoreallfailures
          4⤵
          • Modifies boot configuration data using bcdedit
          PID:4000
        • C:\Windows\system32\bcdedit.exe
          bcdedit /set {default} recoveryenabled no
          4⤵
          • Modifies boot configuration data using bcdedit
          PID:2148
      • C:\Windows\System32\cmd.exe
        "C:\Windows\System32\cmd.exe" /C wbadmin delete catalog -quiet
        3⤵
        • Suspicious use of WriteProcessMemory
        PID:4580
        • C:\Windows\system32\wbadmin.exe
          wbadmin delete catalog -quiet
          4⤵
          • Deletes backup catalog
          PID:4024
      • 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:4984
  • C:\Windows\system32\vssvc.exe
    C:\Windows\system32\vssvc.exe
    1⤵
    • Suspicious use of AdjustPrivilegeToken
    PID:1260
  • C:\Windows\system32\wbengine.exe
    "C:\Windows\system32\wbengine.exe"
    1⤵
    • Suspicious use of AdjustPrivilegeToken
    PID:2520
  • C:\Windows\System32\vdsldr.exe
    C:\Windows\System32\vdsldr.exe -Embedding
    1⤵
      PID:2688
    • C:\Windows\System32\vds.exe
      C:\Windows\System32\vds.exe
      1⤵
      • Checks SCSI registry key(s)
      PID:3620

    Network

    MITRE ATT&CK Enterprise v15

    Replay Monitor

    Loading Replay Monitor...

    Downloads

    • C:\Users\Admin\AppData\Local\Microsoft\CLR_v4.0\UsageLogs\Antivirus.exe.log

      Filesize

      1KB

      MD5

      baf55b95da4a601229647f25dad12878

      SHA1

      abc16954ebfd213733c4493fc1910164d825cac8

      SHA256

      ee954c5d8156fd8890e582c716e5758ed9b33721258f10e758bdc31ccbcb1924

      SHA512

      24f502fedb1a305d0d7b08857ffc1db9b2359ff34e06d5748ecc84e35c985f29a20d9f0a533bea32d234ab37097ec0481620c63b14ac89b280e75e14d19fd545

    • 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\Admin\Desktop\DenyWatch.m1v

      Filesize

      1B

      MD5

      d1457b72c3fb323a2671125aef3eab5d

      SHA1

      5bab61eb53176449e25c2c82f172b82cb13ffb9d

      SHA256

      8a8de823d5ed3e12746a62ef169bcf372be0ca44f0a1236abc35df05d96928e1

      SHA512

      ca63c07ad35d8c9fb0c92d6146759b122d4ec5d3f67ebe2f30ddb69f9e6c9fd3bf31a5e408b08f1d4d9cd68120cced9e57f010bef3cde97653fed5470da7d1a0

    • memory/4504-16-0x00007FFF7EEC0000-0x00007FFF7F981000-memory.dmp

      Filesize

      10.8MB

    • memory/4504-1185-0x00007FFF7EEC0000-0x00007FFF7F981000-memory.dmp

      Filesize

      10.8MB

    • memory/5064-0-0x0000000000440000-0x0000000000462000-memory.dmp

      Filesize

      136KB

    • memory/5064-1-0x00007FFF7EEC0000-0x00007FFF7F981000-memory.dmp

      Filesize

      10.8MB

    • memory/5064-2-0x000000001B040000-0x000000001B050000-memory.dmp

      Filesize

      64KB

    • memory/5064-15-0x00007FFF7EEC0000-0x00007FFF7F981000-memory.dmp

      Filesize

      10.8MB