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Analysis

  • max time kernel
    644s
  • max time network
    646s
  • platform
    windows11-21h2_x64
  • resource
    win11-20240221-en
  • resource tags

    arch:x64arch:x86image:win11-20240221-enlocale:en-usos:windows11-21h2-x64system
  • submitted
    08/04/2024, 21:56

Errors

Reason
Machine shutdown

General

  • Target

    Flash Player.exe

  • Size

    534KB

  • MD5

    670c5e520902ccad978f4171dab178f4

  • SHA1

    09d08afadf92f6d7303ed406f7da32ddd708090a

  • SHA256

    d9f889aecab50e4037018337cbbe4cc3c3b0f3647dc3e97de909d3aaa0c47097

  • SHA512

    ec01f7aae8a909435823309748179408fe8b09288c4f8ba936a1c2b24ba8c2ee81dc5b9903c8401995855ba320daf79c9f755509560ded9cc697eb777f150931

  • SSDEEP

    12288:rdJX8v+mtT+AAAAAAAAAAAAAAAXAbAAAAAAAAAAAAAAAAAAAAAbAAAgAxAAAAAAk:rXHmtT

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 (193) 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 6 IoCs
  • Executes dropped EXE 13 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 2 IoCs
  • Drops desktop.ini file(s) 34 IoCs
  • Legitimate hosting services abused for malware hosting/C2 1 TTPs 1 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.

  • Creates scheduled task(s) 1 TTPs 1 IoCs

    Schtasks is often used by malware for persistence or to perform post-infection execution.

  • Interacts with shadow copies 2 TTPs 1 IoCs

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

  • Modifies data under HKEY_USERS 13 IoCs
  • Modifies registry class 1 IoCs
  • Opens file in notepad (likely ransom note) 1 IoCs
  • Suspicious behavior: AddClipboardFormatListener 1 IoCs
  • Suspicious behavior: EnumeratesProcesses 35 IoCs
  • Suspicious use of AdjustPrivilegeToken 64 IoCs
  • Suspicious use of WriteProcessMemory 41 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\Flash Player.exe
    "C:\Users\Admin\AppData\Local\Temp\Flash Player.exe"
    1⤵
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:2088
    • C:\Users\Admin\AppData\Roaming\cssrs.exe
      "C:\Users\Admin\AppData\Roaming\cssrs.exe"
      2⤵
      • Drops startup file
      • Executes dropped EXE
      • Adds Run key to start application
      • Modifies registry class
      • Suspicious use of AdjustPrivilegeToken
      • Suspicious use of WriteProcessMemory
      PID:4864
      • C:\Windows\SysWOW64\schtasks.exe
        schtasks /delete /tn "NvidiaDreever" /f
        3⤵
          PID:864
        • C:\Windows\SysWOW64\schtasks.exe
          schtasks /create /sc minute /mo 1 /tn "NvidiaDreever" /tr C:\Users\Admin\AppData\Roaming\cssrs.exe
          3⤵
          • Creates scheduled task(s)
          PID:5088
        • C:\Users\Admin\AppData\Local\Temp\c9e3fc8f2d75425083b04dfc7ec85742.exe
          "C:\Users\Admin\AppData\Local\Temp\c9e3fc8f2d75425083b04dfc7ec85742.exe"
          3⤵
          • Executes dropped EXE
          • Suspicious behavior: EnumeratesProcesses
          • Suspicious use of AdjustPrivilegeToken
          • Suspicious use of WriteProcessMemory
          PID:4308
          • C:\Users\Admin\AppData\Roaming\XXX555.exe
            "C:\Users\Admin\AppData\Roaming\XXX555.exe"
            4⤵
            • 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:3240
            • C:\Windows\System32\cmd.exe
              "C:\Windows\System32\cmd.exe" /C vssadmin delete shadows /all /quiet & wmic shadowcopy delete
              5⤵
              • Suspicious use of WriteProcessMemory
              PID:4340
              • C:\Windows\system32\vssadmin.exe
                vssadmin delete shadows /all /quiet
                6⤵
                • Interacts with shadow copies
                PID:3892
              • C:\Windows\System32\Wbem\WMIC.exe
                wmic shadowcopy delete
                6⤵
                • Suspicious use of AdjustPrivilegeToken
                PID:2344
            • C:\Windows\System32\cmd.exe
              "C:\Windows\System32\cmd.exe" /C bcdedit /set {default} bootstatuspolicy ignoreallfailures & bcdedit /set {default} recoveryenabled no
              5⤵
              • Suspicious use of WriteProcessMemory
              PID:884
              • C:\Windows\system32\bcdedit.exe
                bcdedit /set {default} bootstatuspolicy ignoreallfailures
                6⤵
                • Modifies boot configuration data using bcdedit
                PID:1624
              • C:\Windows\system32\bcdedit.exe
                bcdedit /set {default} recoveryenabled no
                6⤵
                • Modifies boot configuration data using bcdedit
                PID:4488
            • C:\Windows\System32\cmd.exe
              "C:\Windows\System32\cmd.exe" /C wbadmin delete catalog -quiet
              5⤵
              • Suspicious use of WriteProcessMemory
              PID:2040
              • C:\Windows\system32\wbadmin.exe
                wbadmin delete catalog -quiet
                6⤵
                • Deletes backup catalog
                PID:2008
        • C:\Windows\SysWOW64\NOTEPAD.EXE
          "C:\Windows\system32\NOTEPAD.EXE" C:\Users\Admin\AppData\Local\Temp\a0759b0b762a4f45b5b566506273c6d2.txt
          3⤵
          • Opens file in notepad (likely ransom note)
          PID:1472
        • C:\Windows\SysWOW64\shutdown.exe
          "C:\Windows\System32\shutdown.exe" /s /t 00
          3⤵
            PID:3408
        • C:\Windows\SysWOW64\cmd.exe
          "C:\Windows\System32\cmd.exe" /C choice /C Y /N /D Y /T 5 & Del "C:\Users\Admin\AppData\Local\Temp\Flash Player.exe"
          2⤵
          • Suspicious use of WriteProcessMemory
          PID:4692
          • C:\Windows\SysWOW64\choice.exe
            choice /C Y /N /D Y /T 5
            3⤵
              PID:3616
        • C:\Windows\system32\vssvc.exe
          C:\Windows\system32\vssvc.exe
          1⤵
          • Suspicious use of AdjustPrivilegeToken
          PID:1332
        • C:\Windows\system32\wbengine.exe
          "C:\Windows\system32\wbengine.exe"
          1⤵
          • Suspicious use of AdjustPrivilegeToken
          PID:3036
        • C:\Windows\System32\vdsldr.exe
          C:\Windows\System32\vdsldr.exe -Embedding
          1⤵
            PID:3356
          • C:\Windows\System32\vds.exe
            C:\Windows\System32\vds.exe
            1⤵
            • Checks SCSI registry key(s)
            PID:1768
          • C:\Users\Admin\AppData\Roaming\cssrs.exe
            C:\Users\Admin\AppData\Roaming\cssrs.exe
            1⤵
            • Executes dropped EXE
            PID:1660
          • C:\Users\Admin\AppData\Roaming\cssrs.exe
            C:\Users\Admin\AppData\Roaming\cssrs.exe
            1⤵
            • Executes dropped EXE
            PID:1140
          • C:\Users\Admin\AppData\Roaming\cssrs.exe
            C:\Users\Admin\AppData\Roaming\cssrs.exe
            1⤵
            • Executes dropped EXE
            PID:3936
          • C:\Users\Admin\AppData\Roaming\cssrs.exe
            C:\Users\Admin\AppData\Roaming\cssrs.exe
            1⤵
            • Executes dropped EXE
            PID:676
          • C:\Users\Admin\AppData\Roaming\cssrs.exe
            C:\Users\Admin\AppData\Roaming\cssrs.exe
            1⤵
            • Executes dropped EXE
            PID:5084
          • C:\Users\Admin\AppData\Roaming\cssrs.exe
            C:\Users\Admin\AppData\Roaming\cssrs.exe
            1⤵
            • Executes dropped EXE
            PID:1788
          • C:\Users\Admin\AppData\Roaming\cssrs.exe
            C:\Users\Admin\AppData\Roaming\cssrs.exe
            1⤵
            • Executes dropped EXE
            PID:2432
          • C:\Users\Admin\AppData\Roaming\cssrs.exe
            C:\Users\Admin\AppData\Roaming\cssrs.exe
            1⤵
            • Executes dropped EXE
            PID:3124
          • C:\Users\Admin\AppData\Roaming\cssrs.exe
            C:\Users\Admin\AppData\Roaming\cssrs.exe
            1⤵
            • Executes dropped EXE
            PID:3156
          • C:\Users\Admin\AppData\Roaming\cssrs.exe
            C:\Users\Admin\AppData\Roaming\cssrs.exe
            1⤵
            • Executes dropped EXE
            PID:2560
          • C:\Windows\system32\LogonUI.exe
            "LogonUI.exe" /flags:0x4 /state0:0xa3a20855 /state1:0x41c64e6d
            1⤵
            • Modifies data under HKEY_USERS
            PID:1700

          Network

          MITRE ATT&CK Enterprise v15

          Replay Monitor

          Loading Replay Monitor...

          Downloads

          • C:\Users\Admin\AppData\Local\Microsoft\CLR_v4.0_32\UsageLogs\cssrs.exe.log

            Filesize

            617B

            MD5

            c66cf802a892edafbc83ff0079efbd11

            SHA1

            872238b3ee0a9386a9fd634efd6e09668984fa6b

            SHA256

            4ab646f8bf5623ebac140b0b649eae85c7e864866013151d56ce996d96d64153

            SHA512

            e44b332728209d34691db8618acceacdc3366769abd8f96370e9de4e684e062e426591f9ff1dc086203db2bd0a812aff1038211638899e8b078b0819badd0708

          • C:\Users\Admin\AppData\Local\Temp\a0759b0b762a4f45b5b566506273c6d2.txt

            Filesize

            59B

            MD5

            403bb7ecdfbb13b27a7b7ae2e6b8014f

            SHA1

            8277f0e4ae5648dc81e824e8a7ee36f80adbdbef

            SHA256

            08819d4f60facc62ae8564157cc34163eb7e5ad4c4732109c9d4a7d20e76f783

            SHA512

            b4b14e33bc11c99c839ef8f963c972f62fe63ec9af0300e3aeaf1868c95f71e66355e437dd4902f5d9904dc54beb94e4aec6c214e3c88ce0d81eb761e283393e

          • C:\Users\Admin\AppData\Local\Temp\c9e3fc8f2d75425083b04dfc7ec85742.exe

            Filesize

            1.2MB

            MD5

            e4ea9a5aee8f1d7576d8237b52fe345c

            SHA1

            abf5a63f22b6d953a3cf8304f52cd2ceb1701055

            SHA256

            d2d89b20e8f6fed21b4d8747df80d8c43107853e9d820cb9d5aeb832a36d773b

            SHA512

            761f1ca9ea9dd5c2c0930d3681467924a1d4ab9cd64d02ddbe2d8555a021e96f9f8b260c3a80ea96d18115999f2289686b4644ee240864a0d3000620facf90e8

          • C:\Users\Admin\AppData\Local\Temp\hphzsvxxug.gif

            Filesize

            422KB

            MD5

            705a10144ffd51597b863af7b6dc6761

            SHA1

            68e3ff4a0c5c498e958431cc4379f33042900194

            SHA256

            cbc8a31345ac302681cac85e5347de1ffcbaa12bdc50c679ecf99cda7fc5157e

            SHA512

            00685116a9471c2f95534932eedf29e70c0486cdb16235770ff3ab8655396ead19378c29f57f298ac2d17e202ed8e75b4ecab282a1be4cb40dd27774568107a3

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

            Filesize

            534KB

            MD5

            670c5e520902ccad978f4171dab178f4

            SHA1

            09d08afadf92f6d7303ed406f7da32ddd708090a

            SHA256

            d9f889aecab50e4037018337cbbe4cc3c3b0f3647dc3e97de909d3aaa0c47097

            SHA512

            ec01f7aae8a909435823309748179408fe8b09288c4f8ba936a1c2b24ba8c2ee81dc5b9903c8401995855ba320daf79c9f755509560ded9cc697eb777f150931

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

            Filesize

            171B

            MD5

            3e6c4d018bb590573ad262cc1715d7b9

            SHA1

            d1b9156f9c88feb4d8da5d6b18d7861622794960

            SHA256

            06442ae852bdef53ce2a12888f2204f0b2facd1fb43cbba94869adc97e6ad00a

            SHA512

            4bba042c7c071d1f63ac51c1e2c4ff440c5bf00f1836668cc7048f35332da9a7324b41394596c0da9fb77c8a6ececc722f955185dd0f983c2c236ea19bfb0b19

          • memory/676-503-0x0000000075200000-0x00000000759B1000-memory.dmp

            Filesize

            7.7MB

          • memory/676-504-0x0000000075200000-0x00000000759B1000-memory.dmp

            Filesize

            7.7MB

          • memory/1140-498-0x0000000075200000-0x00000000759B1000-memory.dmp

            Filesize

            7.7MB

          • memory/1140-497-0x0000000075200000-0x00000000759B1000-memory.dmp

            Filesize

            7.7MB

          • memory/1660-493-0x0000000075200000-0x00000000759B1000-memory.dmp

            Filesize

            7.7MB

          • memory/1660-491-0x0000000075200000-0x00000000759B1000-memory.dmp

            Filesize

            7.7MB

          • memory/1788-510-0x0000000075200000-0x00000000759B1000-memory.dmp

            Filesize

            7.7MB

          • memory/1788-509-0x0000000075200000-0x00000000759B1000-memory.dmp

            Filesize

            7.7MB

          • memory/2088-14-0x0000000075200000-0x00000000759B1000-memory.dmp

            Filesize

            7.7MB

          • memory/2088-1-0x0000000075200000-0x00000000759B1000-memory.dmp

            Filesize

            7.7MB

          • memory/2088-3-0x0000000005240000-0x00000000057E6000-memory.dmp

            Filesize

            5.6MB

          • memory/2088-2-0x0000000004BF0000-0x0000000004C8C000-memory.dmp

            Filesize

            624KB

          • memory/2088-0-0x0000000000090000-0x000000000011C000-memory.dmp

            Filesize

            560KB

          • memory/2432-513-0x0000000075200000-0x00000000759B1000-memory.dmp

            Filesize

            7.7MB

          • memory/2432-512-0x0000000075200000-0x00000000759B1000-memory.dmp

            Filesize

            7.7MB

          • memory/2560-532-0x0000000075200000-0x00000000759B1000-memory.dmp

            Filesize

            7.7MB

          • memory/2560-531-0x0000000075200000-0x00000000759B1000-memory.dmp

            Filesize

            7.7MB

          • memory/3124-516-0x0000000075200000-0x00000000759B1000-memory.dmp

            Filesize

            7.7MB

          • memory/3124-515-0x0000000075200000-0x00000000759B1000-memory.dmp

            Filesize

            7.7MB

          • memory/3156-529-0x0000000075200000-0x00000000759B1000-memory.dmp

            Filesize

            7.7MB

          • memory/3156-525-0x0000000075200000-0x00000000759B1000-memory.dmp

            Filesize

            7.7MB

          • memory/3240-489-0x000000001B220000-0x000000001B230000-memory.dmp

            Filesize

            64KB

          • memory/3240-533-0x00007FFF99BA0000-0x00007FFF9A662000-memory.dmp

            Filesize

            10.8MB

          • memory/3240-50-0x00007FFF99BA0000-0x00007FFF9A662000-memory.dmp

            Filesize

            10.8MB

          • memory/3240-488-0x00007FFF99BA0000-0x00007FFF9A662000-memory.dmp

            Filesize

            10.8MB

          • memory/3936-500-0x0000000075200000-0x00000000759B1000-memory.dmp

            Filesize

            7.7MB

          • memory/3936-501-0x0000000075200000-0x00000000759B1000-memory.dmp

            Filesize

            7.7MB

          • memory/4308-49-0x00007FFF99BA0000-0x00007FFF9A662000-memory.dmp

            Filesize

            10.8MB

          • memory/4308-36-0x00007FFF99BA0000-0x00007FFF9A662000-memory.dmp

            Filesize

            10.8MB

          • memory/4308-35-0x0000000000E40000-0x0000000000F76000-memory.dmp

            Filesize

            1.2MB

          • memory/4864-19-0x0000000005430000-0x00000000054C2000-memory.dmp

            Filesize

            584KB

          • memory/4864-22-0x0000000006520000-0x0000000006538000-memory.dmp

            Filesize

            96KB

          • memory/4864-23-0x0000000075200000-0x00000000759B1000-memory.dmp

            Filesize

            7.7MB

          • memory/4864-17-0x0000000005240000-0x0000000005250000-memory.dmp

            Filesize

            64KB

          • memory/4864-522-0x00000000053E0000-0x00000000053EA000-memory.dmp

            Filesize

            40KB

          • memory/4864-13-0x0000000075200000-0x00000000759B1000-memory.dmp

            Filesize

            7.7MB

          • memory/4864-20-0x00000000053C0000-0x00000000053CA000-memory.dmp

            Filesize

            40KB

          • memory/4864-21-0x0000000005660000-0x00000000056C6000-memory.dmp

            Filesize

            408KB

          • memory/4864-52-0x0000000005240000-0x0000000005250000-memory.dmp

            Filesize

            64KB

          • memory/4864-534-0x0000000075200000-0x00000000759B1000-memory.dmp

            Filesize

            7.7MB

          • memory/5084-507-0x0000000075200000-0x00000000759B1000-memory.dmp

            Filesize

            7.7MB

          • memory/5084-506-0x0000000075200000-0x00000000759B1000-memory.dmp

            Filesize

            7.7MB