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Analysis

  • max time kernel
    111s
  • max time network
    128s
  • platform
    windows7_x64
  • resource
    win7-20240221-en
  • resource tags

    arch:x64arch:x86image:win7-20240221-enlocale:en-usos:windows7-x64system
  • submitted
    08/04/2024, 21:56

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 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 (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.

  • Deletes itself 1 IoCs
  • Drops startup file 6 IoCs
  • Executes dropped EXE 5 IoCs
  • Loads dropped DLL 2 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 2 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).

  • 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.

  • Opens file in notepad (likely ransom note) 1 IoCs
  • Suspicious behavior: AddClipboardFormatListener 1 IoCs
  • Suspicious behavior: EnumeratesProcesses 7 IoCs
  • Suspicious use of AdjustPrivilegeToken 64 IoCs
  • Suspicious use of WriteProcessMemory 62 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⤵
    • Loads dropped DLL
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:2104
    • C:\Users\Admin\AppData\Roaming\cssrs.exe
      "C:\Users\Admin\AppData\Roaming\cssrs.exe"
      2⤵
      • Drops startup file
      • Executes dropped EXE
      • Loads dropped DLL
      • Adds Run key to start application
      • Suspicious use of AdjustPrivilegeToken
      • Suspicious use of WriteProcessMemory
      PID:3020
      • C:\Windows\SysWOW64\schtasks.exe
        schtasks /delete /tn "NvidiaDreever" /f
        3⤵
          PID:1980
        • 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:2408
        • C:\Users\Admin\AppData\Local\Temp\4d9fed084801431486ffc9a8cb69237c.exe
          "C:\Users\Admin\AppData\Local\Temp\4d9fed084801431486ffc9a8cb69237c.exe"
          3⤵
          • Executes dropped EXE
          • Suspicious behavior: EnumeratesProcesses
          • Suspicious use of AdjustPrivilegeToken
          • Suspicious use of WriteProcessMemory
          PID:1808
          • 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:1972
            • 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:3028
              • C:\Windows\system32\vssadmin.exe
                vssadmin delete shadows /all /quiet
                6⤵
                • Interacts with shadow copies
                PID:860
              • C:\Windows\System32\Wbem\WMIC.exe
                wmic shadowcopy delete
                6⤵
                • Suspicious use of AdjustPrivilegeToken
                PID:2532
            • 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:2520
              • C:\Windows\system32\bcdedit.exe
                bcdedit /set {default} bootstatuspolicy ignoreallfailures
                6⤵
                • Modifies boot configuration data using bcdedit
                PID:2424
              • C:\Windows\system32\bcdedit.exe
                bcdedit /set {default} recoveryenabled no
                6⤵
                • Modifies boot configuration data using bcdedit
                PID:2412
            • C:\Windows\System32\cmd.exe
              "C:\Windows\System32\cmd.exe" /C wbadmin delete catalog -quiet
              5⤵
              • Suspicious use of WriteProcessMemory
              PID:2404
              • C:\Windows\system32\wbadmin.exe
                wbadmin delete catalog -quiet
                6⤵
                • Deletes backup catalog
                PID:568
            • 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:540
      • 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⤵
        • Deletes itself
        • Suspicious use of WriteProcessMemory
        PID:2640
        • C:\Windows\SysWOW64\choice.exe
          choice /C Y /N /D Y /T 5
          3⤵
            PID:2532
      • C:\Windows\system32\taskeng.exe
        taskeng.exe {E949B889-5754-477E-8DB2-5B43C891A98F} S-1-5-21-330940541-141609230-1670313778-1000:KXIPPCKF\Admin:Interactive:[1]
        1⤵
        • Suspicious use of WriteProcessMemory
        PID:580
        • C:\Users\Admin\AppData\Roaming\cssrs.exe
          C:\Users\Admin\AppData\Roaming\cssrs.exe
          2⤵
          • Executes dropped EXE
          • Suspicious use of AdjustPrivilegeToken
          PID:1548
        • C:\Users\Admin\AppData\Roaming\cssrs.exe
          C:\Users\Admin\AppData\Roaming\cssrs.exe
          2⤵
          • Executes dropped EXE
          PID:2140
      • C:\Windows\system32\vssvc.exe
        C:\Windows\system32\vssvc.exe
        1⤵
        • Suspicious use of AdjustPrivilegeToken
        PID:2760
      • C:\Windows\system32\wbengine.exe
        "C:\Windows\system32\wbengine.exe"
        1⤵
        • Suspicious use of AdjustPrivilegeToken
        PID:1648
      • C:\Windows\System32\vdsldr.exe
        C:\Windows\System32\vdsldr.exe -Embedding
        1⤵
          PID:1860
        • C:\Windows\System32\vds.exe
          C:\Windows\System32\vds.exe
          1⤵
            PID:2320

          Network

          MITRE ATT&CK Enterprise v15

          Replay Monitor

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          Downloads

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

            Filesize

            171B

            MD5

            3e6c4d018bb590573ad262cc1715d7b9

            SHA1

            d1b9156f9c88feb4d8da5d6b18d7861622794960

            SHA256

            06442ae852bdef53ce2a12888f2204f0b2facd1fb43cbba94869adc97e6ad00a

            SHA512

            4bba042c7c071d1f63ac51c1e2c4ff440c5bf00f1836668cc7048f35332da9a7324b41394596c0da9fb77c8a6ececc722f955185dd0f983c2c236ea19bfb0b19

          • \Users\Admin\AppData\Local\Temp\4d9fed084801431486ffc9a8cb69237c.exe

            Filesize

            1.2MB

            MD5

            5ac0301392b4b41c55a8fa525ce1fc71

            SHA1

            e1e852d4a292bf2885cfb075cfc0b57a4c352ed0

            SHA256

            770375f7bce6884c1b5dc9458ae0ee3982b0b7ce9bdf7259c631faf9f9facc22

            SHA512

            d4d4b5c53e86f8a59f10b5208ebfe3a9fd5b98b471de001782f8de3c220af23c6cf662f387252869262d21dd92b7e3933f6674967cd3e4bab7666978ad31d5f1

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

            Filesize

            534KB

            MD5

            670c5e520902ccad978f4171dab178f4

            SHA1

            09d08afadf92f6d7303ed406f7da32ddd708090a

            SHA256

            d9f889aecab50e4037018337cbbe4cc3c3b0f3647dc3e97de909d3aaa0c47097

            SHA512

            ec01f7aae8a909435823309748179408fe8b09288c4f8ba936a1c2b24ba8c2ee81dc5b9903c8401995855ba320daf79c9f755509560ded9cc697eb777f150931

          • memory/1548-18-0x0000000074860000-0x0000000074F4E000-memory.dmp

            Filesize

            6.9MB

          • memory/1548-20-0x0000000074860000-0x0000000074F4E000-memory.dmp

            Filesize

            6.9MB

          • memory/1808-27-0x0000000001390000-0x00000000014C6000-memory.dmp

            Filesize

            1.2MB

          • memory/1808-28-0x000007FEF5870000-0x000007FEF625C000-memory.dmp

            Filesize

            9.9MB

          • memory/1808-465-0x000007FEF5870000-0x000007FEF625C000-memory.dmp

            Filesize

            9.9MB

          • memory/1972-467-0x000000001AFB0000-0x000000001B030000-memory.dmp

            Filesize

            512KB

          • memory/1972-466-0x000007FEF5870000-0x000007FEF625C000-memory.dmp

            Filesize

            9.9MB

          • memory/1972-38-0x000000001AFB0000-0x000000001B030000-memory.dmp

            Filesize

            512KB

          • memory/1972-34-0x000007FEF5870000-0x000007FEF625C000-memory.dmp

            Filesize

            9.9MB

          • memory/1972-35-0x00000000001F0000-0x0000000000326000-memory.dmp

            Filesize

            1.2MB

          • memory/2104-1-0x0000000074860000-0x0000000074F4E000-memory.dmp

            Filesize

            6.9MB

          • memory/2104-0-0x0000000000930000-0x00000000009BC000-memory.dmp

            Filesize

            560KB

          • memory/2104-11-0x0000000074860000-0x0000000074F4E000-memory.dmp

            Filesize

            6.9MB

          • memory/2140-469-0x0000000074860000-0x0000000074F4E000-memory.dmp

            Filesize

            6.9MB

          • memory/2140-470-0x0000000074860000-0x0000000074F4E000-memory.dmp

            Filesize

            6.9MB

          • memory/3020-10-0x0000000074860000-0x0000000074F4E000-memory.dmp

            Filesize

            6.9MB

          • memory/3020-37-0x00000000005A0000-0x00000000005E0000-memory.dmp

            Filesize

            256KB

          • memory/3020-9-0x0000000001320000-0x00000000013AC000-memory.dmp

            Filesize

            560KB

          • memory/3020-15-0x00000000005A0000-0x00000000005E0000-memory.dmp

            Filesize

            256KB

          • memory/3020-459-0x0000000004CB0000-0x0000000004CBA000-memory.dmp

            Filesize

            40KB

          • memory/3020-19-0x00000000005A0000-0x00000000005E0000-memory.dmp

            Filesize

            256KB

          • memory/3020-17-0x0000000074860000-0x0000000074F4E000-memory.dmp

            Filesize

            6.9MB