Analysis

  • max time kernel
    89s
  • max time network
    151s
  • platform
    windows10_x64
  • resource
    win10v20201028
  • submitted
    13-02-2021 13:52

General

  • Target

    95C8.exe

  • Size

    684KB

  • MD5

    7efdbcd2dda98974f89290ce0a02cdc7

  • SHA1

    cbae61ac09fe75b570bee392aa70310ef4d94362

  • SHA256

    eb8de87523800e3aa747857a06938f3af3856fbd42be025688e2ff50248ac197

  • SHA512

    b9d334d10bc4c02007efcdd789a4fb91bffa3790c8d8357f438cd167c86097acc0b6d4889c1b81de77c42e8b7d5f04f3a8dffca80adc2a9148051b68d1215adc

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
  • 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 user/profile data of local email clients 2 TTPs

    Email clients store some user data on disk where infostealers will often target it.

  • 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.

  • 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 47 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\95C8.exe
    "C:\Users\Admin\AppData\Local\Temp\95C8.exe"
    1⤵
    • Adds Run key to start application
    • Modifies system certificate store
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious use of WriteProcessMemory
    PID:4692
    • C:\Windows\SysWOW64\icacls.exe
      icacls "C:\Users\Admin\AppData\Local\a01920a9-34cd-4ad6-b245-962d72f22d75" /deny *S-1-1-0:(OI)(CI)(DE,DC)
      2⤵
      • Modifies file permissions
      PID:3144
    • C:\Users\Admin\AppData\Local\Temp\95C8.exe
      "C:\Users\Admin\AppData\Local\Temp\95C8.exe" --Admin IsNotAutoStart IsNotTask
      2⤵
      • Suspicious behavior: EnumeratesProcesses
      • Suspicious use of WriteProcessMemory
      PID:3804
      • C:\Users\Admin\AppData\Local\a932a68d-e54e-451f-b666-c6f74e236478\updatewin1.exe
        "C:\Users\Admin\AppData\Local\a932a68d-e54e-451f-b666-c6f74e236478\updatewin1.exe"
        3⤵
        • Executes dropped EXE
        • Suspicious use of WriteProcessMemory
        PID:992
        • C:\Users\Admin\AppData\Local\a932a68d-e54e-451f-b666-c6f74e236478\updatewin1.exe
          "C:\Users\Admin\AppData\Local\a932a68d-e54e-451f-b666-c6f74e236478\updatewin1.exe" --Admin
          4⤵
          • Executes dropped EXE
          • Suspicious use of WriteProcessMemory
          PID:4392
          • C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
            powershell -Command Set-ExecutionPolicy -Scope CurrentUser RemoteSigned
            5⤵
            • Suspicious behavior: EnumeratesProcesses
            • Suspicious use of AdjustPrivilegeToken
            PID:4464
          • 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 behavior: EnumeratesProcesses
            • Suspicious use of AdjustPrivilegeToken
            • Suspicious use of WriteProcessMemory
            PID:4572
            • 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 behavior: EnumeratesProcesses
              • Suspicious use of AdjustPrivilegeToken
              PID:3332
          • C:\Program Files\Windows Defender\mpcmdrun.exe
            "C:\Program Files\Windows Defender\mpcmdrun.exe" -removedefinitions -all
            5⤵
            • Deletes Windows Defender Definitions
            PID:3596
          • C:\Windows\SysWOW64\cmd.exe
            C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\delself.bat""
            5⤵
              PID:3400
        • C:\Users\Admin\AppData\Local\a932a68d-e54e-451f-b666-c6f74e236478\updatewin2.exe
          "C:\Users\Admin\AppData\Local\a932a68d-e54e-451f-b666-c6f74e236478\updatewin2.exe"
          3⤵
          • Drops file in Drivers directory
          • Executes dropped EXE
          PID:1412
        • C:\Users\Admin\AppData\Local\a932a68d-e54e-451f-b666-c6f74e236478\updatewin.exe
          "C:\Users\Admin\AppData\Local\a932a68d-e54e-451f-b666-c6f74e236478\updatewin.exe"
          3⤵
          • Executes dropped EXE
          • Suspicious use of WriteProcessMemory
          PID:1588
          • C:\Windows\SysWOW64\cmd.exe
            /c timeout /t 3 & del /f /q C:\Users\Admin\AppData\Local\a932a68d-e54e-451f-b666-c6f74e236478\updatewin.exe
            4⤵
            • Suspicious use of WriteProcessMemory
            PID:3556
            • C:\Windows\SysWOW64\timeout.exe
              timeout /t 3
              5⤵
              • Delays execution with timeout.exe
              PID:4388
        • C:\Users\Admin\AppData\Local\a932a68d-e54e-451f-b666-c6f74e236478\5.exe
          "C:\Users\Admin\AppData\Local\a932a68d-e54e-451f-b666-c6f74e236478\5.exe"
          3⤵
          • Executes dropped EXE
          • Loads dropped DLL
          • Checks processor information in registry
          • Suspicious behavior: EnumeratesProcesses
          • Suspicious use of WriteProcessMemory
          PID:2068
          • C:\Windows\SysWOW64\cmd.exe
            "C:\Windows\System32\cmd.exe" /c taskkill /im 5.exe /f & erase C:\Users\Admin\AppData\Local\a932a68d-e54e-451f-b666-c6f74e236478\5.exe & exit
            4⤵
            • Suspicious use of WriteProcessMemory
            PID:4532
            • C:\Windows\SysWOW64\taskkill.exe
              taskkill /im 5.exe /f
              5⤵
              • Kills process with taskkill
              • Suspicious use of AdjustPrivilegeToken
              PID:4520

    Network

    MITRE ATT&CK Enterprise v6

    Replay Monitor

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    Downloads

    • memory/992-18-0x0000000002110000-0x0000000002111000-memory.dmp

      Filesize

      4KB

    • memory/992-42-0x0000000000400000-0x0000000000432000-memory.dmp

      Filesize

      200KB

    • memory/1412-22-0x0000000002040000-0x0000000002041000-memory.dmp

      Filesize

      4KB

    • memory/1412-45-0x0000000000400000-0x0000000000432000-memory.dmp

      Filesize

      200KB

    • memory/2068-29-0x0000000003FE0000-0x0000000003FE1000-memory.dmp

      Filesize

      4KB

    • memory/2068-30-0x0000000003FE0000-0x0000000004067000-memory.dmp

      Filesize

      540KB

    • memory/2068-36-0x0000000000400000-0x000000000048C000-memory.dmp

      Filesize

      560KB

    • memory/2068-35-0x0000000002410000-0x0000000002498000-memory.dmp

      Filesize

      544KB

    • memory/3332-124-0x00000000090C0000-0x00000000090C1000-memory.dmp

      Filesize

      4KB

    • memory/3332-112-0x0000000008180000-0x0000000008181000-memory.dmp

      Filesize

      4KB

    • memory/3332-130-0x0000000009090000-0x0000000009091000-memory.dmp

      Filesize

      4KB

    • memory/3332-99-0x0000000071B90000-0x000000007227E000-memory.dmp

      Filesize

      6.9MB

    • memory/3332-127-0x0000000004993000-0x0000000004994000-memory.dmp

      Filesize

      4KB

    • memory/3332-126-0x000000007EF70000-0x000000007EF71000-memory.dmp

      Filesize

      4KB

    • memory/3332-128-0x0000000009170000-0x0000000009171000-memory.dmp

      Filesize

      4KB

    • memory/3332-106-0x0000000007730000-0x0000000007731000-memory.dmp

      Filesize

      4KB

    • memory/3332-110-0x0000000004990000-0x0000000004991000-memory.dmp

      Filesize

      4KB

    • memory/3332-111-0x0000000004992000-0x0000000004993000-memory.dmp

      Filesize

      4KB

    • memory/3804-8-0x0000000000CE0000-0x0000000000CE1000-memory.dmp

      Filesize

      4KB

    • memory/3804-10-0x0000000000400000-0x0000000000537000-memory.dmp

      Filesize

      1.2MB

    • memory/4392-41-0x0000000002280000-0x0000000002281000-memory.dmp

      Filesize

      4KB

    • memory/4464-53-0x0000000007C30000-0x0000000007C31000-memory.dmp

      Filesize

      4KB

    • memory/4464-81-0x00000000075F6000-0x00000000075F8000-memory.dmp

      Filesize

      8KB

    • memory/4464-71-0x000000007EF10000-0x000000007EF11000-memory.dmp

      Filesize

      4KB

    • memory/4464-72-0x0000000009C70000-0x0000000009C71000-memory.dmp

      Filesize

      4KB

    • memory/4464-73-0x0000000009E30000-0x0000000009E31000-memory.dmp

      Filesize

      4KB

    • memory/4464-74-0x00000000075F3000-0x00000000075F4000-memory.dmp

      Filesize

      4KB

    • memory/4464-75-0x0000000008C00000-0x0000000008C01000-memory.dmp

      Filesize

      4KB

    • memory/4464-63-0x0000000009B30000-0x0000000009B63000-memory.dmp

      Filesize

      204KB

    • memory/4464-48-0x0000000071840000-0x0000000071F2E000-memory.dmp

      Filesize

      6.9MB

    • memory/4464-56-0x0000000007B60000-0x0000000007B61000-memory.dmp

      Filesize

      4KB

    • memory/4464-55-0x0000000007A40000-0x0000000007A41000-memory.dmp

      Filesize

      4KB

    • memory/4464-50-0x00000000075F0000-0x00000000075F1000-memory.dmp

      Filesize

      4KB

    • memory/4464-57-0x0000000008360000-0x0000000008361000-memory.dmp

      Filesize

      4KB

    • memory/4464-61-0x0000000008B60000-0x0000000008B61000-memory.dmp

      Filesize

      4KB

    • memory/4464-52-0x0000000005340000-0x0000000005341000-memory.dmp

      Filesize

      4KB

    • memory/4464-54-0x00000000075F2000-0x00000000075F3000-memory.dmp

      Filesize

      4KB

    • memory/4464-70-0x0000000009B10000-0x0000000009B11000-memory.dmp

      Filesize

      4KB

    • memory/4464-60-0x00000000089D0000-0x00000000089D1000-memory.dmp

      Filesize

      4KB

    • memory/4464-59-0x0000000007BD0000-0x0000000007BD1000-memory.dmp

      Filesize

      4KB

    • memory/4464-58-0x00000000083D0000-0x00000000083D1000-memory.dmp

      Filesize

      4KB

    • memory/4572-95-0x00000000095B0000-0x00000000095B1000-memory.dmp

      Filesize

      4KB

    • memory/4572-94-0x0000000008FA0000-0x0000000008FA1000-memory.dmp

      Filesize

      4KB

    • memory/4572-108-0x0000000004973000-0x0000000004974000-memory.dmp

      Filesize

      4KB

    • memory/4572-90-0x0000000008440000-0x0000000008441000-memory.dmp

      Filesize

      4KB

    • memory/4572-87-0x0000000007B00000-0x0000000007B01000-memory.dmp

      Filesize

      4KB

    • memory/4572-83-0x0000000004972000-0x0000000004973000-memory.dmp

      Filesize

      4KB

    • memory/4572-82-0x0000000004970000-0x0000000004971000-memory.dmp

      Filesize

      4KB

    • memory/4572-78-0x0000000071F40000-0x000000007262E000-memory.dmp

      Filesize

      6.9MB

    • memory/4692-2-0x0000000000C90000-0x0000000000C91000-memory.dmp

      Filesize

      4KB

    • memory/4692-4-0x0000000000400000-0x0000000000537000-memory.dmp

      Filesize

      1.2MB

    • memory/4692-3-0x0000000000C90000-0x0000000000DAA000-memory.dmp

      Filesize

      1.1MB