Analysis

  • max time kernel
    68s
  • max time network
    130s
  • platform
    windows10_x64
  • resource
    win10v20210408
  • submitted
    05/05/2021, 17:26

General

  • Target
    dc00eb5a66b87a51f308cb804916811d.exe
  • Size 842KB
  • Sample210505-1bdnvz1k9a
  • SHA256 e0fffaaa25dc5ace2bf9e00b3787ebb45299f98fc8d4dbe6aad888c03e6164aa
  • MD5 SHA1 SHA512

Malware Config

Signatures

  • Deletes Windows Defender Definitions 2 TTPs 1 IoCs

    Uses mpcmdrun utility to delete all AV definitions.

  • Djvu Ransomware

    Ransomware which is a variant of the STOP family.

  • Vidar

    Vidar is an infostealer based on Arkei stealer.

  • Disables Task Manager via registry modification
  • Downloads MZ/PE file
  • Drops file in Drivers directory 1 IoCs
  • Executes dropped EXE 4 IoCs
  • Loads dropped DLL 2 IoCs
  • Modifies file permissions 1 TTPs 1 IoCs
  • Reads local data of messenger clients 2 TTPs

    Infostealers often target stored data of messaging applications, which can include saved credentials and account information.

  • Reads user/profile data of web browsers 2 TTPs

    Infostealers often target stored browser data, which can include saved credentials etc.

  • Accesses 2FA software files, possible credential harvesting 2 TTPs
  • Accesses cryptocurrency files/wallets, possible credential harvesting 2 TTPs
  • Adds Run key to start application 2 TTPs 1 IoCs
  • Checks installed software on the system 1 TTPs

    Looks up Uninstall key entries in the registry to enumerate software on the system.

  • Looks up external IP address via web service 3 IoCs

    Uses a legitimate IP lookup service to find the infected system's external IP.

  • Enumerates physical storage devices 1 TTPs

    Attempts to interact with connected storage/optical drive(s). Likely ransomware behaviour.

  • Program crash 14 IoCs
  • Checks processor information in registry 2 TTPs 2 IoCs

    Processor information is often read in order to detect sandboxing environments.

  • Delays execution with timeout.exe 1 IoCs
  • Kills process with taskkill 1 IoCs
  • Modifies system certificate store 2 TTPs 2 IoCs
  • Suspicious behavior: EnumeratesProcesses 64 IoCs
  • Suspicious use of AdjustPrivilegeToken 20 IoCs
  • Suspicious use of WriteProcessMemory 41 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\dc00eb5a66b87a51f308cb804916811d.exe
    "C:\Users\Admin\AppData\Local\Temp\dc00eb5a66b87a51f308cb804916811d.exe"
    1⤵
    • Adds Run key to start application
    • Modifies system certificate store
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious use of WriteProcessMemory
    PID:996
    • C:\Windows\SysWOW64\icacls.exe
      icacls "C:\Users\Admin\AppData\Local\295bb616-b108-4b9b-941f-3521ec46c734" /deny *S-1-1-0:(OI)(CI)(DE,DC)
      2⤵
      • Modifies file permissions
      PID:204
    • C:\Users\Admin\AppData\Local\Temp\dc00eb5a66b87a51f308cb804916811d.exe
      "C:\Users\Admin\AppData\Local\Temp\dc00eb5a66b87a51f308cb804916811d.exe" --Admin IsNotAutoStart IsNotTask
      2⤵
      • Suspicious behavior: EnumeratesProcesses
      • Suspicious use of WriteProcessMemory
      PID:1308
      • C:\Users\Admin\AppData\Local\28e7063b-c42a-4888-82a3-fb17123f7fca\updatewin1.exe
        "C:\Users\Admin\AppData\Local\28e7063b-c42a-4888-82a3-fb17123f7fca\updatewin1.exe"
        3⤵
        • Executes dropped EXE
        • Suspicious use of WriteProcessMemory
        PID:3892
        • C:\Users\Admin\AppData\Local\28e7063b-c42a-4888-82a3-fb17123f7fca\updatewin1.exe
          "C:\Users\Admin\AppData\Local\28e7063b-c42a-4888-82a3-fb17123f7fca\updatewin1.exe" --Admin
          4⤵
          • Executes dropped EXE
          • Suspicious use of WriteProcessMemory
          PID:696
          • C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
            powershell -Command Set-ExecutionPolicy -Scope CurrentUser RemoteSigned
            5⤵
            • Suspicious use of AdjustPrivilegeToken
            PID:2384
          • C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
            powershell -NoProfile -ExecutionPolicy Bypass -Command "& {Start-Process PowerShell -ArgumentList '-NoProfile -ExecutionPolicy Bypass -File ""C:\Users\Admin\AppData\Local\script.ps1""' -Verb RunAs}"
            5⤵
            • Suspicious use of AdjustPrivilegeToken
            • Suspicious use of WriteProcessMemory
            PID:4036
            • C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
              "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -NoProfile -ExecutionPolicy Bypass -File "C:\Users\Admin\AppData\Local\script.ps1
              6⤵
              • Suspicious use of AdjustPrivilegeToken
              PID:2640
          • C:\Program Files\Windows Defender\mpcmdrun.exe
            "C:\Program Files\Windows Defender\mpcmdrun.exe" -removedefinitions -all
            5⤵
            • Deletes Windows Defender Definitions
            PID:2200
          • C:\Windows\SysWOW64\cmd.exe
            C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\delself.bat""
            5⤵
              PID:204
        • C:\Users\Admin\AppData\Local\28e7063b-c42a-4888-82a3-fb17123f7fca\updatewin2.exe
          "C:\Users\Admin\AppData\Local\28e7063b-c42a-4888-82a3-fb17123f7fca\updatewin2.exe"
          3⤵
          • Drops file in Drivers directory
          • Executes dropped EXE
          PID:2644
        • C:\Users\Admin\AppData\Local\28e7063b-c42a-4888-82a3-fb17123f7fca\5.exe
          "C:\Users\Admin\AppData\Local\28e7063b-c42a-4888-82a3-fb17123f7fca\5.exe"
          3⤵
          • Executes dropped EXE
          • Loads dropped DLL
          • Checks processor information in registry
          • Suspicious use of WriteProcessMemory
          PID:3824
          • C:\Windows\SysWOW64\WerFault.exe
            C:\Windows\SysWOW64\WerFault.exe -u -p 3824 -s 840
            4⤵
            • Program crash
            • Suspicious behavior: EnumeratesProcesses
            • Suspicious use of AdjustPrivilegeToken
            PID:1164
          • C:\Windows\SysWOW64\WerFault.exe
            C:\Windows\SysWOW64\WerFault.exe -u -p 3824 -s 932
            4⤵
            • Program crash
            • Suspicious behavior: EnumeratesProcesses
            • Suspicious use of AdjustPrivilegeToken
            PID:1872
          • C:\Windows\SysWOW64\WerFault.exe
            C:\Windows\SysWOW64\WerFault.exe -u -p 3824 -s 1076
            4⤵
            • Program crash
            • Suspicious behavior: EnumeratesProcesses
            • Suspicious use of AdjustPrivilegeToken
            PID:2636
          • C:\Windows\SysWOW64\WerFault.exe
            C:\Windows\SysWOW64\WerFault.exe -u -p 3824 -s 1080
            4⤵
            • Program crash
            • Suspicious behavior: EnumeratesProcesses
            • Suspicious use of AdjustPrivilegeToken
            PID:3716
          • C:\Windows\SysWOW64\WerFault.exe
            C:\Windows\SysWOW64\WerFault.exe -u -p 3824 -s 1088
            4⤵
            • Program crash
            • Suspicious use of AdjustPrivilegeToken
            PID:680
          • C:\Windows\SysWOW64\WerFault.exe
            C:\Windows\SysWOW64\WerFault.exe -u -p 3824 -s 1112
            4⤵
            • Program crash
            • Suspicious use of AdjustPrivilegeToken
            PID:2908
          • C:\Windows\SysWOW64\WerFault.exe
            C:\Windows\SysWOW64\WerFault.exe -u -p 3824 -s 1404
            4⤵
            • Program crash
            • Suspicious use of AdjustPrivilegeToken
            PID:2296
          • C:\Windows\SysWOW64\WerFault.exe
            C:\Windows\SysWOW64\WerFault.exe -u -p 3824 -s 1448
            4⤵
            • Program crash
            • Suspicious use of AdjustPrivilegeToken
            PID:2216
          • C:\Windows\SysWOW64\WerFault.exe
            C:\Windows\SysWOW64\WerFault.exe -u -p 3824 -s 1668
            4⤵
            • Program crash
            • Suspicious use of AdjustPrivilegeToken
            PID:2092
          • C:\Windows\SysWOW64\WerFault.exe
            C:\Windows\SysWOW64\WerFault.exe -u -p 3824 -s 1616
            4⤵
            • Program crash
            • Suspicious use of AdjustPrivilegeToken
            PID:2224
          • C:\Windows\SysWOW64\WerFault.exe
            C:\Windows\SysWOW64\WerFault.exe -u -p 3824 -s 1572
            4⤵
            • Program crash
            • Suspicious use of AdjustPrivilegeToken
            PID:2340
          • C:\Windows\SysWOW64\WerFault.exe
            C:\Windows\SysWOW64\WerFault.exe -u -p 3824 -s 1688
            4⤵
            • Program crash
            • Suspicious use of AdjustPrivilegeToken
            PID:2384
          • C:\Windows\SysWOW64\WerFault.exe
            C:\Windows\SysWOW64\WerFault.exe -u -p 3824 -s 1704
            4⤵
            • Program crash
            • Suspicious use of AdjustPrivilegeToken
            PID:2692
          • C:\Windows\SysWOW64\WerFault.exe
            C:\Windows\SysWOW64\WerFault.exe -u -p 3824 -s 1824
            4⤵
            • Program crash
            • Suspicious use of AdjustPrivilegeToken
            PID:2292
          • C:\Windows\SysWOW64\cmd.exe
            "C:\Windows\System32\cmd.exe" /c taskkill /im 5.exe /f & timeout /t 6 & del /f /q "C:\Users\Admin\AppData\Local\28e7063b-c42a-4888-82a3-fb17123f7fca\5.exe" & del C:\ProgramData\*.dll & exit
            4⤵
            • Suspicious use of WriteProcessMemory
            PID:3176
            • C:\Windows\SysWOW64\taskkill.exe
              taskkill /im 5.exe /f
              5⤵
              • Kills process with taskkill
              • Suspicious use of AdjustPrivilegeToken
              PID:2200
            • C:\Windows\SysWOW64\timeout.exe
              timeout /t 6
              5⤵
              • Delays execution with timeout.exe
              PID:192

    Network

          MITRE ATT&CK Enterprise v6

          Replay Monitor

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          Downloads

          memory/696-146-0x0000000000400000-0x000000000044D000-memory.dmp

          memory/996-115-0x0000000000400000-0x00000000008CB000-memory.dmp

          memory/996-114-0x00000000025C0000-0x00000000026DA000-memory.dmp

          memory/1308-120-0x0000000000400000-0x00000000008CB000-memory.dmp

          memory/2384-153-0x0000000007450000-0x0000000007451000-memory.dmp

          memory/2384-187-0x0000000009810000-0x0000000009811000-memory.dmp

          memory/2384-155-0x0000000007BE0000-0x0000000007BE1000-memory.dmp

          memory/2384-156-0x0000000007D90000-0x0000000007D91000-memory.dmp

          memory/2384-157-0x00000000080E0000-0x00000000080E1000-memory.dmp

          memory/2384-158-0x00000000085C0000-0x00000000085C1000-memory.dmp

          memory/2384-159-0x0000000008500000-0x0000000008501000-memory.dmp

          memory/2384-152-0x0000000006F02000-0x0000000006F03000-memory.dmp

          memory/2384-151-0x0000000006F00000-0x0000000006F01000-memory.dmp

          memory/2384-150-0x0000000007540000-0x0000000007541000-memory.dmp

          memory/2384-149-0x0000000006D50000-0x0000000006D51000-memory.dmp

          memory/2384-224-0x0000000006F06000-0x0000000006F08000-memory.dmp

          memory/2384-173-0x00000000092A0000-0x00000000092D3000-memory.dmp

          memory/2384-175-0x000000007E7D0000-0x000000007E7D1000-memory.dmp

          memory/2384-181-0x0000000009280000-0x0000000009281000-memory.dmp

          memory/2384-186-0x00000000093F0000-0x00000000093F1000-memory.dmp

          memory/2384-154-0x0000000007B70000-0x0000000007B71000-memory.dmp

          memory/2384-192-0x0000000006F03000-0x0000000006F04000-memory.dmp

          memory/2640-232-0x00000000048D0000-0x00000000048D1000-memory.dmp

          memory/2640-237-0x00000000048D3000-0x00000000048D4000-memory.dmp

          memory/2640-236-0x000000007F0A0000-0x000000007F0A1000-memory.dmp

          memory/2640-233-0x00000000048D2000-0x00000000048D3000-memory.dmp

          memory/2644-141-0x0000000000400000-0x000000000044D000-memory.dmp

          memory/3824-134-0x00000000020F0000-0x0000000002187000-memory.dmp

          memory/3824-135-0x0000000000400000-0x00000000004B4000-memory.dmp

          memory/3892-138-0x0000000000400000-0x000000000044D000-memory.dmp

          memory/4036-231-0x0000000004A43000-0x0000000004A44000-memory.dmp

          memory/4036-226-0x0000000004A42000-0x0000000004A43000-memory.dmp

          memory/4036-225-0x0000000004A40000-0x0000000004A41000-memory.dmp