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Analysis

  • max time kernel
    132s
  • max time network
    141s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20240226-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20240226-enlocale:en-usos:windows10-2004-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 (186) 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.

  • Checks computer location settings 2 TTPs 4 IoCs

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

  • Drops startup file 6 IoCs
  • Executes dropped EXE 4 IoCs
  • Reads data files stored by FTP clients 2 TTPs

    Tries to access configuration files associated with programs like FileZilla.

  • 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 15 IoCs
  • Modifies registry class 1 IoCs
  • Opens file in notepad (likely ransom note) 1 IoCs
  • Suspicious behavior: AddClipboardFormatListener 1 IoCs
  • Suspicious behavior: EnumeratesProcesses 45 IoCs
  • Suspicious use of AdjustPrivilegeToken 64 IoCs
  • Suspicious use of SetWindowsHookEx 1 IoCs
  • Suspicious use of WriteProcessMemory 40 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⤵
    • Checks computer location settings
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:4236
    • C:\Users\Admin\AppData\Roaming\cssrs.exe
      "C:\Users\Admin\AppData\Roaming\cssrs.exe"
      2⤵
      • Checks computer location settings
      • Drops startup file
      • Executes dropped EXE
      • Adds Run key to start application
      • Suspicious use of AdjustPrivilegeToken
      • Suspicious use of WriteProcessMemory
      PID:100
      • C:\Windows\SysWOW64\schtasks.exe
        schtasks /delete /tn "NvidiaDreever" /f
        3⤵
          PID:3828
        • 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:1444
        • C:\Users\Admin\AppData\Local\Temp\54c28bb4716a4e6c97b4cc2e0bb29741.exe
          "C:\Users\Admin\AppData\Local\Temp\54c28bb4716a4e6c97b4cc2e0bb29741.exe"
          3⤵
          • Checks computer location settings
          • Executes dropped EXE
          • Suspicious behavior: EnumeratesProcesses
          • Suspicious use of AdjustPrivilegeToken
          • Suspicious use of WriteProcessMemory
          PID:3948
          • C:\Users\Admin\AppData\Roaming\XXX555.exe
            "C:\Users\Admin\AppData\Roaming\XXX555.exe"
            4⤵
            • 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:2484
            • 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:728
              • C:\Windows\system32\vssadmin.exe
                vssadmin delete shadows /all /quiet
                6⤵
                • Interacts with shadow copies
                PID:5004
              • C:\Windows\System32\Wbem\WMIC.exe
                wmic shadowcopy delete
                6⤵
                • Suspicious use of AdjustPrivilegeToken
                PID:1096
            • 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:3604
              • C:\Windows\system32\bcdedit.exe
                bcdedit /set {default} bootstatuspolicy ignoreallfailures
                6⤵
                • Modifies boot configuration data using bcdedit
                PID:1836
              • C:\Windows\system32\bcdedit.exe
                bcdedit /set {default} recoveryenabled no
                6⤵
                • Modifies boot configuration data using bcdedit
                PID:5008
            • C:\Windows\System32\cmd.exe
              "C:\Windows\System32\cmd.exe" /C wbadmin delete catalog -quiet
              5⤵
              • Suspicious use of WriteProcessMemory
              PID:972
              • C:\Windows\system32\wbadmin.exe
                wbadmin delete catalog -quiet
                6⤵
                • Deletes backup catalog
                PID:3968
            • C:\Windows\system32\NOTEPAD.EXE
              "C:\Windows\system32\NOTEPAD.EXE" C:\Users\Admin\AppData\Roaming\RESTORE.txt
              5⤵
              • Opens file in notepad (likely ransom note)
              PID:3288
        • C:\Windows\SysWOW64\shutdown.exe
          "C:\Windows\System32\shutdown.exe" /r /t 00
          3⤵
            PID:1208
        • 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:2868
          • C:\Windows\SysWOW64\choice.exe
            choice /C Y /N /D Y /T 5
            3⤵
              PID:4748
        • C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe
          "C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe" --type=utility --utility-sub-type=asset_store.mojom.AssetStoreService --lang=en-US --service-sandbox-type=asset_store_service --no-appcompat-clear --mojo-platform-channel-handle=3896 --field-trial-handle=2304,i,6987730730348465820,3913273227385401271,262144 --variations-seed-version /prefetch:8
          1⤵
            PID:3852
          • C:\Users\Admin\AppData\Roaming\cssrs.exe
            C:\Users\Admin\AppData\Roaming\cssrs.exe
            1⤵
            • Executes dropped EXE
            • Suspicious use of AdjustPrivilegeToken
            PID:3520
          • C:\Windows\system32\vssvc.exe
            C:\Windows\system32\vssvc.exe
            1⤵
            • Suspicious use of AdjustPrivilegeToken
            PID:3944
          • C:\Windows\system32\wbengine.exe
            "C:\Windows\system32\wbengine.exe"
            1⤵
            • Suspicious use of AdjustPrivilegeToken
            PID:4748
          • C:\Windows\System32\vdsldr.exe
            C:\Windows\System32\vdsldr.exe -Embedding
            1⤵
              PID:1960
            • C:\Windows\System32\vds.exe
              C:\Windows\System32\vds.exe
              1⤵
              • Checks SCSI registry key(s)
              PID:2304
            • C:\Windows\system32\LogonUI.exe
              "LogonUI.exe" /flags:0x4 /state0:0xa39af855 /state1:0x41c64e6d
              1⤵
              • Modifies data under HKEY_USERS
              • Suspicious use of SetWindowsHookEx
              PID:4420

            Network

            MITRE ATT&CK Enterprise v15

            Replay Monitor

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            Downloads

            • C:\Users\Admin\AppData\Local\Temp\54c28bb4716a4e6c97b4cc2e0bb29741.exe

              Filesize

              1.2MB

              MD5

              5ac0301392b4b41c55a8fa525ce1fc71

              SHA1

              e1e852d4a292bf2885cfb075cfc0b57a4c352ed0

              SHA256

              770375f7bce6884c1b5dc9458ae0ee3982b0b7ce9bdf7259c631faf9f9facc22

              SHA512

              d4d4b5c53e86f8a59f10b5208ebfe3a9fd5b98b471de001782f8de3c220af23c6cf662f387252869262d21dd92b7e3933f6674967cd3e4bab7666978ad31d5f1

            • 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/100-483-0x0000000001500000-0x0000000001510000-memory.dmp

              Filesize

              64KB

            • memory/100-37-0x0000000005860000-0x0000000005870000-memory.dmp

              Filesize

              64KB

            • memory/100-12-0x0000000075120000-0x00000000758D0000-memory.dmp

              Filesize

              7.7MB

            • memory/100-484-0x0000000007420000-0x0000000007774000-memory.dmp

              Filesize

              3.3MB

            • memory/100-17-0x0000000005860000-0x0000000005870000-memory.dmp

              Filesize

              64KB

            • memory/100-19-0x00000000059C0000-0x0000000005A52000-memory.dmp

              Filesize

              584KB

            • memory/100-20-0x0000000005970000-0x000000000597A000-memory.dmp

              Filesize

              40KB

            • memory/100-21-0x0000000005BC0000-0x0000000005C26000-memory.dmp

              Filesize

              408KB

            • memory/100-22-0x0000000006AD0000-0x0000000006AE8000-memory.dmp

              Filesize

              96KB

            • memory/100-23-0x0000000075120000-0x00000000758D0000-memory.dmp

              Filesize

              7.7MB

            • memory/100-486-0x0000000075120000-0x00000000758D0000-memory.dmp

              Filesize

              7.7MB

            • memory/2484-57-0x000000001B450000-0x000000001B460000-memory.dmp

              Filesize

              64KB

            • memory/2484-476-0x00007FFC3C3C0000-0x00007FFC3CE81000-memory.dmp

              Filesize

              10.8MB

            • memory/2484-485-0x00007FFC3C3C0000-0x00007FFC3CE81000-memory.dmp

              Filesize

              10.8MB

            • memory/2484-482-0x000000001B450000-0x000000001B460000-memory.dmp

              Filesize

              64KB

            • memory/2484-52-0x00007FFC3C3C0000-0x00007FFC3CE81000-memory.dmp

              Filesize

              10.8MB

            • memory/3520-39-0x0000000075120000-0x00000000758D0000-memory.dmp

              Filesize

              7.7MB

            • memory/3520-55-0x0000000075120000-0x00000000758D0000-memory.dmp

              Filesize

              7.7MB

            • memory/3948-53-0x00007FFC3C3C0000-0x00007FFC3CE81000-memory.dmp

              Filesize

              10.8MB

            • memory/3948-36-0x00007FFC3C3C0000-0x00007FFC3CE81000-memory.dmp

              Filesize

              10.8MB

            • memory/3948-35-0x0000000000050000-0x0000000000186000-memory.dmp

              Filesize

              1.2MB

            • memory/4236-14-0x0000000075120000-0x00000000758D0000-memory.dmp

              Filesize

              7.7MB

            • memory/4236-0-0x0000000075120000-0x00000000758D0000-memory.dmp

              Filesize

              7.7MB

            • memory/4236-3-0x0000000005E40000-0x00000000063E4000-memory.dmp

              Filesize

              5.6MB

            • memory/4236-2-0x00000000057B0000-0x000000000584C000-memory.dmp

              Filesize

              624KB

            • memory/4236-1-0x0000000000D40000-0x0000000000DCC000-memory.dmp

              Filesize

              560KB