Analysis

  • max time kernel
    66s
  • max time network
    128s
  • platform
    windows10_x64
  • resource
    win10v20201028
  • submitted
    13/02/2021, 11:35

General

  • Target

    B9B1.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\B9B1.exe
    "C:\Users\Admin\AppData\Local\Temp\B9B1.exe"
    1⤵
    • Adds Run key to start application
    • Modifies system certificate store
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious use of WriteProcessMemory
    PID:412
    • C:\Windows\SysWOW64\icacls.exe
      icacls "C:\Users\Admin\AppData\Local\bb89d61e-a283-4b86-9fbc-60fdfb180646" /deny *S-1-1-0:(OI)(CI)(DE,DC)
      2⤵
      • Modifies file permissions
      PID:3776
    • C:\Users\Admin\AppData\Local\Temp\B9B1.exe
      "C:\Users\Admin\AppData\Local\Temp\B9B1.exe" --Admin IsNotAutoStart IsNotTask
      2⤵
      • Suspicious behavior: EnumeratesProcesses
      • Suspicious use of WriteProcessMemory
      PID:3568
      • C:\Users\Admin\AppData\Local\0abd520e-d7ad-460a-939d-43ef859fc083\updatewin1.exe
        "C:\Users\Admin\AppData\Local\0abd520e-d7ad-460a-939d-43ef859fc083\updatewin1.exe"
        3⤵
        • Executes dropped EXE
        • Suspicious use of WriteProcessMemory
        PID:3144
        • C:\Users\Admin\AppData\Local\0abd520e-d7ad-460a-939d-43ef859fc083\updatewin1.exe
          "C:\Users\Admin\AppData\Local\0abd520e-d7ad-460a-939d-43ef859fc083\updatewin1.exe" --Admin
          4⤵
          • Executes dropped EXE
          • Suspicious use of WriteProcessMemory
          PID:3108
          • C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
            powershell -Command Set-ExecutionPolicy -Scope CurrentUser RemoteSigned
            5⤵
            • Suspicious behavior: EnumeratesProcesses
            • Suspicious use of AdjustPrivilegeToken
            PID:900
          • 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:3880
            • 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:1312
          • C:\Program Files\Windows Defender\mpcmdrun.exe
            "C:\Program Files\Windows Defender\mpcmdrun.exe" -removedefinitions -all
            5⤵
            • Deletes Windows Defender Definitions
            PID:3892
          • C:\Windows\SysWOW64\cmd.exe
            C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\delself.bat""
            5⤵
              PID:3296
        • C:\Users\Admin\AppData\Local\0abd520e-d7ad-460a-939d-43ef859fc083\updatewin2.exe
          "C:\Users\Admin\AppData\Local\0abd520e-d7ad-460a-939d-43ef859fc083\updatewin2.exe"
          3⤵
          • Drops file in Drivers directory
          • Executes dropped EXE
          PID:1028
        • C:\Users\Admin\AppData\Local\0abd520e-d7ad-460a-939d-43ef859fc083\updatewin.exe
          "C:\Users\Admin\AppData\Local\0abd520e-d7ad-460a-939d-43ef859fc083\updatewin.exe"
          3⤵
          • Executes dropped EXE
          • Suspicious use of WriteProcessMemory
          PID:2668
          • C:\Windows\SysWOW64\cmd.exe
            /c timeout /t 3 & del /f /q C:\Users\Admin\AppData\Local\0abd520e-d7ad-460a-939d-43ef859fc083\updatewin.exe
            4⤵
            • Suspicious use of WriteProcessMemory
            PID:3532
            • C:\Windows\SysWOW64\timeout.exe
              timeout /t 3
              5⤵
              • Delays execution with timeout.exe
              PID:1776
        • C:\Users\Admin\AppData\Local\0abd520e-d7ad-460a-939d-43ef859fc083\5.exe
          "C:\Users\Admin\AppData\Local\0abd520e-d7ad-460a-939d-43ef859fc083\5.exe"
          3⤵
          • Executes dropped EXE
          • Loads dropped DLL
          • Checks processor information in registry
          • Suspicious behavior: EnumeratesProcesses
          • Suspicious use of WriteProcessMemory
          PID:3760
          • C:\Windows\SysWOW64\cmd.exe
            "C:\Windows\System32\cmd.exe" /c taskkill /im 5.exe /f & erase C:\Users\Admin\AppData\Local\0abd520e-d7ad-460a-939d-43ef859fc083\5.exe & exit
            4⤵
            • Suspicious use of WriteProcessMemory
            PID:1832
            • C:\Windows\SysWOW64\taskkill.exe
              taskkill /im 5.exe /f
              5⤵
              • Kills process with taskkill
              • Suspicious use of AdjustPrivilegeToken
              PID:1204

    Network

    MITRE ATT&CK Enterprise v6

    Replay Monitor

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    Downloads

    • memory/412-4-0x0000000000400000-0x0000000000537000-memory.dmp

      Filesize

      1.2MB

    • memory/412-3-0x0000000000D20000-0x0000000000E3A000-memory.dmp

      Filesize

      1.1MB

    • memory/412-2-0x0000000000D20000-0x0000000000D21000-memory.dmp

      Filesize

      4KB

    • memory/900-49-0x0000000006680000-0x0000000006681000-memory.dmp

      Filesize

      4KB

    • memory/900-68-0x0000000008F60000-0x0000000008F61000-memory.dmp

      Filesize

      4KB

    • memory/900-81-0x0000000006686000-0x0000000006688000-memory.dmp

      Filesize

      8KB

    • memory/900-71-0x00000000090B0000-0x00000000090B1000-memory.dmp

      Filesize

      4KB

    • memory/900-70-0x0000000006683000-0x0000000006684000-memory.dmp

      Filesize

      4KB

    • memory/900-69-0x0000000009110000-0x0000000009111000-memory.dmp

      Filesize

      4KB

    • memory/900-67-0x0000000008DF0000-0x0000000008DF1000-memory.dmp

      Filesize

      4KB

    • memory/900-62-0x000000007F590000-0x000000007F591000-memory.dmp

      Filesize

      4KB

    • memory/900-59-0x0000000008E30000-0x0000000008E63000-memory.dmp

      Filesize

      204KB

    • memory/900-57-0x0000000007E50000-0x0000000007E51000-memory.dmp

      Filesize

      4KB

    • memory/900-56-0x0000000008070000-0x0000000008071000-memory.dmp

      Filesize

      4KB

    • memory/900-55-0x0000000007B30000-0x0000000007B31000-memory.dmp

      Filesize

      4KB

    • memory/900-54-0x0000000007680000-0x0000000007681000-memory.dmp

      Filesize

      4KB

    • memory/900-53-0x0000000007610000-0x0000000007611000-memory.dmp

      Filesize

      4KB

    • memory/900-52-0x00000000074A0000-0x00000000074A1000-memory.dmp

      Filesize

      4KB

    • memory/900-45-0x0000000072480000-0x0000000072B6E000-memory.dmp

      Filesize

      6.9MB

    • memory/900-47-0x00000000066D0000-0x00000000066D1000-memory.dmp

      Filesize

      4KB

    • memory/900-48-0x0000000006D40000-0x0000000006D41000-memory.dmp

      Filesize

      4KB

    • memory/900-51-0x0000000006CB0000-0x0000000006CB1000-memory.dmp

      Filesize

      4KB

    • memory/900-50-0x0000000006682000-0x0000000006683000-memory.dmp

      Filesize

      4KB

    • memory/1028-22-0x0000000002140000-0x0000000002141000-memory.dmp

      Filesize

      4KB

    • memory/1028-41-0x0000000000400000-0x0000000000432000-memory.dmp

      Filesize

      200KB

    • memory/1312-124-0x00000000090A0000-0x00000000090A1000-memory.dmp

      Filesize

      4KB

    • memory/1312-123-0x00000000068F3000-0x00000000068F4000-memory.dmp

      Filesize

      4KB

    • memory/1312-126-0x0000000009080000-0x0000000009081000-memory.dmp

      Filesize

      4KB

    • memory/1312-104-0x0000000007740000-0x0000000007741000-memory.dmp

      Filesize

      4KB

    • memory/1312-120-0x0000000008F30000-0x0000000008F31000-memory.dmp

      Filesize

      4KB

    • memory/1312-98-0x00000000068F0000-0x00000000068F1000-memory.dmp

      Filesize

      4KB

    • memory/1312-121-0x000000007FBB0000-0x000000007FBB1000-memory.dmp

      Filesize

      4KB

    • memory/1312-107-0x0000000007CE0000-0x0000000007CE1000-memory.dmp

      Filesize

      4KB

    • memory/1312-96-0x00000000720C0000-0x00000000727AE000-memory.dmp

      Filesize

      6.9MB

    • memory/1312-109-0x00000000068F2000-0x00000000068F3000-memory.dmp

      Filesize

      4KB

    • memory/3108-39-0x00000000020C0000-0x00000000020C1000-memory.dmp

      Filesize

      4KB

    • memory/3144-18-0x0000000002180000-0x0000000002181000-memory.dmp

      Filesize

      4KB

    • memory/3144-40-0x0000000000400000-0x0000000000432000-memory.dmp

      Filesize

      200KB

    • memory/3568-8-0x0000000000D60000-0x0000000000D61000-memory.dmp

      Filesize

      4KB

    • memory/3568-14-0x0000000000400000-0x0000000000537000-memory.dmp

      Filesize

      1.2MB

    • memory/3760-31-0x0000000003F70000-0x0000000003F71000-memory.dmp

      Filesize

      4KB

    • memory/3760-32-0x0000000003F70000-0x0000000003FF8000-memory.dmp

      Filesize

      544KB

    • memory/3760-33-0x0000000000400000-0x000000000048C000-memory.dmp

      Filesize

      560KB

    • memory/3880-82-0x0000000004FB0000-0x0000000004FB1000-memory.dmp

      Filesize

      4KB

    • memory/3880-97-0x0000000004FB3000-0x0000000004FB4000-memory.dmp

      Filesize

      4KB

    • memory/3880-91-0x000000000A0B0000-0x000000000A0B1000-memory.dmp

      Filesize

      4KB

    • memory/3880-90-0x0000000009890000-0x0000000009891000-memory.dmp

      Filesize

      4KB

    • memory/3880-83-0x0000000004FB2000-0x0000000004FB3000-memory.dmp

      Filesize

      4KB

    • memory/3880-80-0x0000000008320000-0x0000000008321000-memory.dmp

      Filesize

      4KB

    • memory/3880-74-0x0000000072480000-0x0000000072B6E000-memory.dmp

      Filesize

      6.9MB