Analysis

  • max time kernel
    67s
  • max time network
    129s
  • platform
    windows10_x64
  • resource
    win10v20210408
  • submitted
    05/05/2021, 13:54

General

  • Target
    build.exe
  • Size 831KB
  • Sample210505-vce8dr9192
  • SHA256 3763170476b8a4c3cb592cbea6c4471ba2ea2463db9f7839fda502ef0a06b092
  • 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\build.exe
    "C:\Users\Admin\AppData\Local\Temp\build.exe"
    1⤵
    • Adds Run key to start application
    • Modifies system certificate store
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious use of WriteProcessMemory
    PID:852
    • C:\Windows\SysWOW64\icacls.exe
      icacls "C:\Users\Admin\AppData\Local\4cb66a38-1b75-4297-bece-c43d21a8194b" /deny *S-1-1-0:(OI)(CI)(DE,DC)
      2⤵
      • Modifies file permissions
      PID:2648
    • C:\Users\Admin\AppData\Local\Temp\build.exe
      "C:\Users\Admin\AppData\Local\Temp\build.exe" --Admin IsNotAutoStart IsNotTask
      2⤵
      • Suspicious behavior: EnumeratesProcesses
      • Suspicious use of WriteProcessMemory
      PID:196
      • C:\Users\Admin\AppData\Local\fae3c7bc-8579-483b-b490-49b16a8fb9d3\updatewin1.exe
        "C:\Users\Admin\AppData\Local\fae3c7bc-8579-483b-b490-49b16a8fb9d3\updatewin1.exe"
        3⤵
        • Executes dropped EXE
        • Suspicious use of WriteProcessMemory
        PID:3732
        • C:\Users\Admin\AppData\Local\fae3c7bc-8579-483b-b490-49b16a8fb9d3\updatewin1.exe
          "C:\Users\Admin\AppData\Local\fae3c7bc-8579-483b-b490-49b16a8fb9d3\updatewin1.exe" --Admin
          4⤵
          • Executes dropped EXE
          • Suspicious use of WriteProcessMemory
          PID:424
          • C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
            powershell -Command Set-ExecutionPolicy -Scope CurrentUser RemoteSigned
            5⤵
            • Suspicious use of AdjustPrivilegeToken
            PID:2204
          • 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:1368
            • 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:3644
          • C:\Program Files\Windows Defender\mpcmdrun.exe
            "C:\Program Files\Windows Defender\mpcmdrun.exe" -removedefinitions -all
            5⤵
            • Deletes Windows Defender Definitions
            PID:3176
          • C:\Windows\SysWOW64\cmd.exe
            C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\delself.bat""
            5⤵
              PID:496
        • C:\Users\Admin\AppData\Local\fae3c7bc-8579-483b-b490-49b16a8fb9d3\updatewin2.exe
          "C:\Users\Admin\AppData\Local\fae3c7bc-8579-483b-b490-49b16a8fb9d3\updatewin2.exe"
          3⤵
          • Drops file in Drivers directory
          • Executes dropped EXE
          PID:2120
        • C:\Users\Admin\AppData\Local\fae3c7bc-8579-483b-b490-49b16a8fb9d3\5.exe
          "C:\Users\Admin\AppData\Local\fae3c7bc-8579-483b-b490-49b16a8fb9d3\5.exe"
          3⤵
          • Executes dropped EXE
          • Loads dropped DLL
          • Checks processor information in registry
          • Suspicious use of WriteProcessMemory
          PID:3828
          • C:\Windows\SysWOW64\WerFault.exe
            C:\Windows\SysWOW64\WerFault.exe -u -p 3828 -s 840
            4⤵
            • Program crash
            • Suspicious behavior: EnumeratesProcesses
            • Suspicious use of AdjustPrivilegeToken
            PID:1648
          • C:\Windows\SysWOW64\WerFault.exe
            C:\Windows\SysWOW64\WerFault.exe -u -p 3828 -s 916
            4⤵
            • Program crash
            • Suspicious behavior: EnumeratesProcesses
            • Suspicious use of AdjustPrivilegeToken
            PID:2644
          • C:\Windows\SysWOW64\WerFault.exe
            C:\Windows\SysWOW64\WerFault.exe -u -p 3828 -s 1076
            4⤵
            • Program crash
            • Suspicious behavior: EnumeratesProcesses
            • Suspicious use of AdjustPrivilegeToken
            PID:2868
          • C:\Windows\SysWOW64\WerFault.exe
            C:\Windows\SysWOW64\WerFault.exe -u -p 3828 -s 1052
            4⤵
            • Program crash
            • Suspicious behavior: EnumeratesProcesses
            • Suspicious use of AdjustPrivilegeToken
            PID:2864
          • C:\Windows\SysWOW64\WerFault.exe
            C:\Windows\SysWOW64\WerFault.exe -u -p 3828 -s 1088
            4⤵
            • Program crash
            • Suspicious use of AdjustPrivilegeToken
            PID:852
          • C:\Windows\SysWOW64\WerFault.exe
            C:\Windows\SysWOW64\WerFault.exe -u -p 3828 -s 1152
            4⤵
            • Program crash
            • Suspicious use of AdjustPrivilegeToken
            PID:3880
          • C:\Windows\SysWOW64\WerFault.exe
            C:\Windows\SysWOW64\WerFault.exe -u -p 3828 -s 1448
            4⤵
            • Program crash
            • Suspicious use of AdjustPrivilegeToken
            PID:2172
          • C:\Windows\SysWOW64\WerFault.exe
            C:\Windows\SysWOW64\WerFault.exe -u -p 3828 -s 1412
            4⤵
            • Program crash
            • Suspicious use of AdjustPrivilegeToken
            PID:492
          • C:\Windows\SysWOW64\WerFault.exe
            C:\Windows\SysWOW64\WerFault.exe -u -p 3828 -s 1468
            4⤵
            • Program crash
            • Suspicious use of AdjustPrivilegeToken
            PID:1788
          • C:\Windows\SysWOW64\WerFault.exe
            C:\Windows\SysWOW64\WerFault.exe -u -p 3828 -s 1712
            4⤵
            • Program crash
            • Suspicious use of AdjustPrivilegeToken
            PID:2316
          • C:\Windows\SysWOW64\WerFault.exe
            C:\Windows\SysWOW64\WerFault.exe -u -p 3828 -s 1736
            4⤵
            • Program crash
            • Suspicious use of AdjustPrivilegeToken
            PID:1880
          • C:\Windows\SysWOW64\WerFault.exe
            C:\Windows\SysWOW64\WerFault.exe -u -p 3828 -s 1780
            4⤵
            • Program crash
            • Suspicious use of AdjustPrivilegeToken
            PID:2000
          • C:\Windows\SysWOW64\WerFault.exe
            C:\Windows\SysWOW64\WerFault.exe -u -p 3828 -s 1824
            4⤵
            • Program crash
            • Suspicious use of AdjustPrivilegeToken
            PID:3264
          • C:\Windows\SysWOW64\WerFault.exe
            C:\Windows\SysWOW64\WerFault.exe -u -p 3828 -s 1440
            4⤵
            • Program crash
            • Suspicious use of AdjustPrivilegeToken
            PID:188
          • 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\fae3c7bc-8579-483b-b490-49b16a8fb9d3\5.exe" & del C:\ProgramData\*.dll & exit
            4⤵
            • Suspicious use of WriteProcessMemory
            PID:2588
            • C:\Windows\SysWOW64\taskkill.exe
              taskkill /im 5.exe /f
              5⤵
              • Kills process with taskkill
              • Suspicious use of AdjustPrivilegeToken
              PID:1104
            • C:\Windows\SysWOW64\timeout.exe
              timeout /t 6
              5⤵
              • Delays execution with timeout.exe
              PID:1016

    Network

          MITRE ATT&CK Enterprise v6

          Replay Monitor

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          Downloads

          memory/196-124-0x0000000000400000-0x00000000008C8000-memory.dmp

          memory/424-148-0x0000000000400000-0x000000000044D000-memory.dmp

          memory/852-115-0x0000000000400000-0x00000000008C8000-memory.dmp

          memory/852-114-0x00000000026E0000-0x00000000027FA000-memory.dmp

          memory/1368-229-0x0000000007273000-0x0000000007274000-memory.dmp

          memory/1368-226-0x0000000007272000-0x0000000007273000-memory.dmp

          memory/1368-225-0x0000000007270000-0x0000000007271000-memory.dmp

          memory/2120-141-0x0000000000400000-0x000000000044D000-memory.dmp

          memory/2204-153-0x0000000007590000-0x0000000007591000-memory.dmp

          memory/2204-221-0x0000000004896000-0x0000000004898000-memory.dmp

          memory/2204-159-0x0000000007F30000-0x0000000007F31000-memory.dmp

          memory/2204-167-0x0000000008EC0000-0x0000000008EF3000-memory.dmp

          memory/2204-174-0x0000000008C90000-0x0000000008C91000-memory.dmp

          memory/2204-179-0x0000000009010000-0x0000000009011000-memory.dmp

          memory/2204-157-0x0000000007B10000-0x0000000007B11000-memory.dmp

          memory/2204-156-0x00000000077A0000-0x00000000077A1000-memory.dmp

          memory/2204-155-0x0000000007730000-0x0000000007731000-memory.dmp

          memory/2204-154-0x0000000006EB0000-0x0000000006EB1000-memory.dmp

          memory/2204-151-0x0000000004890000-0x0000000004891000-memory.dmp

          memory/2204-152-0x0000000004892000-0x0000000004893000-memory.dmp

          memory/2204-186-0x000000007E9F0000-0x000000007E9F1000-memory.dmp

          memory/2204-187-0x00000000091D0000-0x00000000091D1000-memory.dmp

          memory/2204-220-0x0000000004893000-0x0000000004894000-memory.dmp

          memory/2204-158-0x0000000008120000-0x0000000008121000-memory.dmp

          memory/2204-150-0x0000000006F60000-0x0000000006F61000-memory.dmp

          memory/2204-149-0x00000000047A0000-0x00000000047A1000-memory.dmp

          memory/3644-234-0x00000000072C2000-0x00000000072C3000-memory.dmp

          memory/3644-233-0x00000000072C0000-0x00000000072C1000-memory.dmp

          memory/3644-236-0x000000007EF40000-0x000000007EF41000-memory.dmp

          memory/3644-237-0x00000000072C3000-0x00000000072C4000-memory.dmp

          memory/3732-140-0x0000000000400000-0x000000000044D000-memory.dmp

          memory/3828-135-0x0000000000400000-0x00000000004B4000-memory.dmp

          memory/3828-134-0x0000000002130000-0x00000000021C7000-memory.dmp