Analysis

  • max time kernel
    120s
  • max time network
    128s
  • platform
    windows10_x64
  • resource
    win10v20210410
  • submitted
    01/06/2021, 06:06

General

  • Target
    7cfc44ba1c64254ae98ee93a9d29afd6.exe
  • Size 845KB
  • Sample210601-xqmaeahgve
  • SHA256 cf98b1f7e33156c7ed25ba1e303e76dea6bfc3141cedebeb19656e36d7e5e8d9
  • MD5 SHA1 SHA512

Malware Config

Extracted

Family
  • vidar

Version
  • 38.9

Botnet
  • 517

C2
  • https://HAL9THapi.faceit.compavel23puef

Attributes
  • profile_id

    517

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.

  • Vidar Stealer 5 IoCs
  • Disables Task Manager via registry modification
  • Downloads MZ/PE file
  • Drops file in Drivers directory 1 IoCs
  • Executes dropped EXE 5 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.

  • Suspicious use of SetThreadContext 3 IoCs
  • Enumerates physical storage devices 1 TTPs

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

  • 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 22 IoCs
  • Suspicious use of AdjustPrivilegeToken 4 IoCs
  • Suspicious use of WriteProcessMemory 64 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\7cfc44ba1c64254ae98ee93a9d29afd6.exe
    "C:\Users\Admin\AppData\Local\Temp\7cfc44ba1c64254ae98ee93a9d29afd6.exe"
    1⤵
    • Suspicious use of SetThreadContext
    • Suspicious use of WriteProcessMemory
    PID:1892
    • C:\Users\Admin\AppData\Local\Temp\7cfc44ba1c64254ae98ee93a9d29afd6.exe
      "C:\Users\Admin\AppData\Local\Temp\7cfc44ba1c64254ae98ee93a9d29afd6.exe"
      2⤵
      • Adds Run key to start application
      • Modifies system certificate store
      • Suspicious behavior: EnumeratesProcesses
      • Suspicious use of WriteProcessMemory
      PID:2088
      • C:\Windows\SysWOW64\icacls.exe
        icacls "C:\Users\Admin\AppData\Local\d7c5e605-5a32-48c6-894d-47918b719fa1" /deny *S-1-1-0:(OI)(CI)(DE,DC)
        3⤵
        • Modifies file permissions
        PID:4088
      • C:\Users\Admin\AppData\Local\Temp\7cfc44ba1c64254ae98ee93a9d29afd6.exe
        "C:\Users\Admin\AppData\Local\Temp\7cfc44ba1c64254ae98ee93a9d29afd6.exe" --Admin IsNotAutoStart IsNotTask
        3⤵
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:4072
        • C:\Users\Admin\AppData\Local\Temp\7cfc44ba1c64254ae98ee93a9d29afd6.exe
          "C:\Users\Admin\AppData\Local\Temp\7cfc44ba1c64254ae98ee93a9d29afd6.exe" --Admin IsNotAutoStart IsNotTask
          4⤵
          • Suspicious behavior: EnumeratesProcesses
          • Suspicious use of WriteProcessMemory
          PID:192
          • C:\Users\Admin\AppData\Local\6d5e903a-ed1f-4388-abd4-b8aedbe36257\updatewin1.exe
            "C:\Users\Admin\AppData\Local\6d5e903a-ed1f-4388-abd4-b8aedbe36257\updatewin1.exe"
            5⤵
            • Executes dropped EXE
            • Suspicious use of WriteProcessMemory
            PID:2580
            • C:\Users\Admin\AppData\Local\6d5e903a-ed1f-4388-abd4-b8aedbe36257\updatewin1.exe
              "C:\Users\Admin\AppData\Local\6d5e903a-ed1f-4388-abd4-b8aedbe36257\updatewin1.exe" --Admin
              6⤵
              • Executes dropped EXE
              • Suspicious use of WriteProcessMemory
              PID:820
              • C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
                powershell -Command Set-ExecutionPolicy -Scope CurrentUser RemoteSigned
                7⤵
                • Suspicious behavior: EnumeratesProcesses
                • Suspicious use of AdjustPrivilegeToken
                PID:3712
              • 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}"
                7⤵
                • Suspicious behavior: EnumeratesProcesses
                • Suspicious use of AdjustPrivilegeToken
                • Suspicious use of WriteProcessMemory
                PID:2204
                • 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
                  8⤵
                  • Suspicious behavior: EnumeratesProcesses
                  • Suspicious use of AdjustPrivilegeToken
                  PID:780
              • C:\Program Files\Windows Defender\mpcmdrun.exe
                "C:\Program Files\Windows Defender\mpcmdrun.exe" -removedefinitions -all
                7⤵
                • Deletes Windows Defender Definitions
                PID:2304
              • C:\Windows\SysWOW64\cmd.exe
                C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\delself.bat""
                7⤵
                  PID:3184
            • C:\Users\Admin\AppData\Local\6d5e903a-ed1f-4388-abd4-b8aedbe36257\updatewin2.exe
              "C:\Users\Admin\AppData\Local\6d5e903a-ed1f-4388-abd4-b8aedbe36257\updatewin2.exe"
              5⤵
              • Drops file in Drivers directory
              • Executes dropped EXE
              PID:1372
            • C:\Users\Admin\AppData\Local\6d5e903a-ed1f-4388-abd4-b8aedbe36257\5.exe
              "C:\Users\Admin\AppData\Local\6d5e903a-ed1f-4388-abd4-b8aedbe36257\5.exe"
              5⤵
              • Executes dropped EXE
              • Suspicious use of SetThreadContext
              • Suspicious use of WriteProcessMemory
              PID:2748
              • C:\Users\Admin\AppData\Local\6d5e903a-ed1f-4388-abd4-b8aedbe36257\5.exe
                "C:\Users\Admin\AppData\Local\6d5e903a-ed1f-4388-abd4-b8aedbe36257\5.exe"
                6⤵
                • Executes dropped EXE
                • Loads dropped DLL
                • Checks processor information in registry
                • Suspicious behavior: EnumeratesProcesses
                • Suspicious use of WriteProcessMemory
                PID:396
                • 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\6d5e903a-ed1f-4388-abd4-b8aedbe36257\5.exe" & del C:\ProgramData\*.dll & exit
                  7⤵
                  • Suspicious use of WriteProcessMemory
                  PID:804
                  • C:\Windows\SysWOW64\taskkill.exe
                    taskkill /im 5.exe /f
                    8⤵
                    • Kills process with taskkill
                    • Suspicious use of AdjustPrivilegeToken
                    PID:3576
                  • C:\Windows\SysWOW64\timeout.exe
                    timeout /t 6
                    8⤵
                    • Delays execution with timeout.exe
                    PID:1224

    Network

          MITRE ATT&CK Enterprise v6

          Replay Monitor

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          Downloads

          memory/192-128-0x0000000000400000-0x0000000000537000-memory.dmp

          memory/396-163-0x0000000000400000-0x000000000049B000-memory.dmp

          memory/396-159-0x0000000000400000-0x000000000049B000-memory.dmp

          memory/780-230-0x00000000068D2000-0x00000000068D3000-memory.dmp

          memory/780-228-0x00000000068D0000-0x00000000068D1000-memory.dmp

          memory/780-231-0x000000007F0B0000-0x000000007F0B1000-memory.dmp

          memory/780-232-0x00000000068D3000-0x00000000068D4000-memory.dmp

          memory/820-150-0x0000000000400000-0x000000000044D000-memory.dmp

          memory/1372-141-0x0000000000400000-0x000000000044D000-memory.dmp

          memory/1892-116-0x0000000002280000-0x000000000239B000-memory.dmp

          memory/2088-114-0x0000000000400000-0x0000000000537000-memory.dmp

          memory/2088-117-0x0000000000400000-0x0000000000537000-memory.dmp

          memory/2204-221-0x0000000007382000-0x0000000007383000-memory.dmp

          memory/2204-220-0x0000000007380000-0x0000000007381000-memory.dmp

          memory/2204-223-0x0000000007383000-0x0000000007384000-memory.dmp

          memory/2580-135-0x0000000000400000-0x000000000044D000-memory.dmp

          memory/2748-162-0x0000000002180000-0x0000000002218000-memory.dmp

          memory/3712-149-0x00000000071C0000-0x00000000071C1000-memory.dmp

          memory/3712-147-0x0000000007120000-0x0000000007121000-memory.dmp

          memory/3712-169-0x0000000008F80000-0x0000000008FB3000-memory.dmp

          memory/3712-176-0x0000000008F40000-0x0000000008F41000-memory.dmp

          memory/3712-182-0x0000000009480000-0x0000000009481000-memory.dmp

          memory/3712-154-0x0000000007290000-0x0000000007291000-memory.dmp

          memory/3712-153-0x0000000002D50000-0x0000000002E9A000-memory.dmp

          memory/3712-152-0x0000000002D50000-0x0000000002E9A000-memory.dmp

          memory/3712-151-0x0000000007AC0000-0x0000000007AC1000-memory.dmp

          memory/3712-156-0x00000000081C0000-0x00000000081C1000-memory.dmp

          memory/3712-155-0x00000000083D0000-0x00000000083D1000-memory.dmp

          memory/3712-146-0x00000000072B0000-0x00000000072B1000-memory.dmp

          memory/3712-148-0x0000000007A50000-0x0000000007A51000-memory.dmp

          memory/3712-219-0x0000000002D50000-0x0000000002E9A000-memory.dmp

          memory/3712-145-0x0000000002E50000-0x0000000002E51000-memory.dmp

          memory/3712-181-0x0000000008FC0000-0x0000000008FC1000-memory.dmp

          memory/3712-213-0x0000000002D50000-0x0000000002E9A000-memory.dmp

          memory/3712-212-0x000000007F920000-0x000000007F921000-memory.dmp