Analysis

  • max time kernel
    65s
  • max time network
    127s
  • platform
    windows10_x64
  • resource
    win10v20201028
  • submitted
    13/02/2021, 11:08

General

  • Target

    8B59.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\8B59.exe
    "C:\Users\Admin\AppData\Local\Temp\8B59.exe"
    1⤵
    • Adds Run key to start application
    • Modifies system certificate store
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious use of WriteProcessMemory
    PID:1028
    • C:\Windows\SysWOW64\icacls.exe
      icacls "C:\Users\Admin\AppData\Local\b6bf5264-48bd-4191-982a-e842136d55f6" /deny *S-1-1-0:(OI)(CI)(DE,DC)
      2⤵
      • Modifies file permissions
      PID:192
    • C:\Users\Admin\AppData\Local\Temp\8B59.exe
      "C:\Users\Admin\AppData\Local\Temp\8B59.exe" --Admin IsNotAutoStart IsNotTask
      2⤵
      • Suspicious behavior: EnumeratesProcesses
      • Suspicious use of WriteProcessMemory
      PID:2552
      • C:\Users\Admin\AppData\Local\91e56562-83ae-415a-b654-9a352571132d\updatewin1.exe
        "C:\Users\Admin\AppData\Local\91e56562-83ae-415a-b654-9a352571132d\updatewin1.exe"
        3⤵
        • Executes dropped EXE
        • Suspicious use of WriteProcessMemory
        PID:2092
        • C:\Users\Admin\AppData\Local\91e56562-83ae-415a-b654-9a352571132d\updatewin1.exe
          "C:\Users\Admin\AppData\Local\91e56562-83ae-415a-b654-9a352571132d\updatewin1.exe" --Admin
          4⤵
          • Executes dropped EXE
          • Suspicious use of WriteProcessMemory
          PID:416
          • C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
            powershell -Command Set-ExecutionPolicy -Scope CurrentUser RemoteSigned
            5⤵
            • Suspicious behavior: EnumeratesProcesses
            • Suspicious use of AdjustPrivilegeToken
            PID:3156
          • 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:2964
            • 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:1336
          • C:\Program Files\Windows Defender\mpcmdrun.exe
            "C:\Program Files\Windows Defender\mpcmdrun.exe" -removedefinitions -all
            5⤵
            • Deletes Windows Defender Definitions
            PID:3624
          • C:\Windows\SysWOW64\cmd.exe
            C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\delself.bat""
            5⤵
              PID:3964
        • C:\Users\Admin\AppData\Local\91e56562-83ae-415a-b654-9a352571132d\updatewin2.exe
          "C:\Users\Admin\AppData\Local\91e56562-83ae-415a-b654-9a352571132d\updatewin2.exe"
          3⤵
          • Drops file in Drivers directory
          • Executes dropped EXE
          PID:3892
        • C:\Users\Admin\AppData\Local\91e56562-83ae-415a-b654-9a352571132d\updatewin.exe
          "C:\Users\Admin\AppData\Local\91e56562-83ae-415a-b654-9a352571132d\updatewin.exe"
          3⤵
          • Executes dropped EXE
          • Suspicious use of WriteProcessMemory
          PID:2100
          • C:\Windows\SysWOW64\cmd.exe
            /c timeout /t 3 & del /f /q C:\Users\Admin\AppData\Local\91e56562-83ae-415a-b654-9a352571132d\updatewin.exe
            4⤵
            • Suspicious use of WriteProcessMemory
            PID:984
            • C:\Windows\SysWOW64\timeout.exe
              timeout /t 3
              5⤵
              • Delays execution with timeout.exe
              PID:3744
        • C:\Users\Admin\AppData\Local\91e56562-83ae-415a-b654-9a352571132d\5.exe
          "C:\Users\Admin\AppData\Local\91e56562-83ae-415a-b654-9a352571132d\5.exe"
          3⤵
          • Executes dropped EXE
          • Loads dropped DLL
          • Checks processor information in registry
          • Suspicious behavior: EnumeratesProcesses
          • Suspicious use of WriteProcessMemory
          PID:3516
          • C:\Windows\SysWOW64\cmd.exe
            "C:\Windows\System32\cmd.exe" /c taskkill /im 5.exe /f & erase C:\Users\Admin\AppData\Local\91e56562-83ae-415a-b654-9a352571132d\5.exe & exit
            4⤵
            • Suspicious use of WriteProcessMemory
            PID:3704
            • C:\Windows\SysWOW64\taskkill.exe
              taskkill /im 5.exe /f
              5⤵
              • Kills process with taskkill
              • Suspicious use of AdjustPrivilegeToken
              PID:2528

    Network

    MITRE ATT&CK Enterprise v6

    Replay Monitor

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    Downloads

    • memory/416-37-0x0000000002250000-0x0000000002251000-memory.dmp

      Filesize

      4KB

    • memory/1028-2-0x0000000000DE0000-0x0000000000DE1000-memory.dmp

      Filesize

      4KB

    • memory/1028-4-0x0000000000400000-0x0000000000537000-memory.dmp

      Filesize

      1.2MB

    • memory/1028-3-0x0000000000C20000-0x0000000000D3A000-memory.dmp

      Filesize

      1.1MB

    • memory/1336-104-0x00000000069D2000-0x00000000069D3000-memory.dmp

      Filesize

      4KB

    • memory/1336-103-0x00000000069D0000-0x00000000069D1000-memory.dmp

      Filesize

      4KB

    • memory/1336-107-0x0000000008220000-0x0000000008221000-memory.dmp

      Filesize

      4KB

    • memory/1336-121-0x000000007F660000-0x000000007F661000-memory.dmp

      Filesize

      4KB

    • memory/1336-94-0x0000000072640000-0x0000000072D2E000-memory.dmp

      Filesize

      6.9MB

    • memory/1336-122-0x00000000069D3000-0x00000000069D4000-memory.dmp

      Filesize

      4KB

    • memory/1336-119-0x00000000090F0000-0x00000000090F1000-memory.dmp

      Filesize

      4KB

    • memory/1336-123-0x0000000009260000-0x0000000009261000-memory.dmp

      Filesize

      4KB

    • memory/1336-125-0x0000000009240000-0x0000000009241000-memory.dmp

      Filesize

      4KB

    • memory/1336-102-0x0000000007880000-0x0000000007881000-memory.dmp

      Filesize

      4KB

    • memory/2092-18-0x00000000022F0000-0x00000000022F1000-memory.dmp

      Filesize

      4KB

    • memory/2092-34-0x0000000000400000-0x0000000000432000-memory.dmp

      Filesize

      200KB

    • memory/2552-14-0x0000000000400000-0x0000000000537000-memory.dmp

      Filesize

      1.2MB

    • memory/2552-8-0x0000000000D20000-0x0000000000D21000-memory.dmp

      Filesize

      4KB

    • memory/2964-81-0x0000000007D50000-0x0000000007D51000-memory.dmp

      Filesize

      4KB

    • memory/2964-101-0x0000000006F13000-0x0000000006F14000-memory.dmp

      Filesize

      4KB

    • memory/2964-90-0x0000000009A60000-0x0000000009A61000-memory.dmp

      Filesize

      4KB

    • memory/2964-89-0x00000000091D0000-0x00000000091D1000-memory.dmp

      Filesize

      4KB

    • memory/2964-85-0x0000000006F12000-0x0000000006F13000-memory.dmp

      Filesize

      4KB

    • memory/2964-84-0x00000000086D0000-0x00000000086D1000-memory.dmp

      Filesize

      4KB

    • memory/2964-72-0x00000000729F0000-0x00000000730DE000-memory.dmp

      Filesize

      6.9MB

    • memory/2964-76-0x0000000006F10000-0x0000000006F11000-memory.dmp

      Filesize

      4KB

    • memory/3156-69-0x0000000009030000-0x0000000009031000-memory.dmp

      Filesize

      4KB

    • memory/3156-47-0x0000000006712000-0x0000000006713000-memory.dmp

      Filesize

      4KB

    • memory/3156-52-0x0000000007570000-0x0000000007571000-memory.dmp

      Filesize

      4KB

    • memory/3156-67-0x0000000008ED0000-0x0000000008ED1000-memory.dmp

      Filesize

      4KB

    • memory/3156-50-0x0000000007640000-0x0000000007641000-memory.dmp

      Filesize

      4KB

    • memory/3156-74-0x0000000006716000-0x0000000006718000-memory.dmp

      Filesize

      8KB

    • memory/3156-73-0x0000000006713000-0x0000000006714000-memory.dmp

      Filesize

      4KB

    • memory/3156-66-0x000000007E550000-0x000000007E551000-memory.dmp

      Filesize

      4KB

    • memory/3156-65-0x0000000008D70000-0x0000000008D71000-memory.dmp

      Filesize

      4KB

    • memory/3156-49-0x00000000075D0000-0x00000000075D1000-memory.dmp

      Filesize

      4KB

    • memory/3156-48-0x0000000006D20000-0x0000000006D21000-memory.dmp

      Filesize

      4KB

    • memory/3156-58-0x0000000008D90000-0x0000000008DC3000-memory.dmp

      Filesize

      204KB

    • memory/3156-51-0x0000000007720000-0x0000000007721000-memory.dmp

      Filesize

      4KB

    • memory/3156-54-0x0000000007DB0000-0x0000000007DB1000-memory.dmp

      Filesize

      4KB

    • memory/3156-68-0x0000000009090000-0x0000000009091000-memory.dmp

      Filesize

      4KB

    • memory/3156-42-0x00000000722F0000-0x00000000729DE000-memory.dmp

      Filesize

      6.9MB

    • memory/3156-43-0x0000000006600000-0x0000000006601000-memory.dmp

      Filesize

      4KB

    • memory/3156-46-0x0000000006710000-0x0000000006711000-memory.dmp

      Filesize

      4KB

    • memory/3156-44-0x0000000006D50000-0x0000000006D51000-memory.dmp

      Filesize

      4KB

    • memory/3156-53-0x0000000007E60000-0x0000000007E61000-memory.dmp

      Filesize

      4KB

    • memory/3516-33-0x0000000000400000-0x000000000048C000-memory.dmp

      Filesize

      560KB

    • memory/3516-32-0x0000000003F70000-0x0000000003FF8000-memory.dmp

      Filesize

      544KB

    • memory/3516-31-0x0000000003F70000-0x0000000003F71000-memory.dmp

      Filesize

      4KB

    • memory/3892-38-0x0000000000400000-0x0000000000432000-memory.dmp

      Filesize

      200KB

    • memory/3892-22-0x0000000002280000-0x0000000002281000-memory.dmp

      Filesize

      4KB