Analysis

  • max time kernel
    90s
  • max time network
    130s
  • platform
    windows10_x64
  • resource
    win10v20210408
  • submitted
    05/05/2021, 18:58

General

  • Target
    6c905b18c6865b7bfa638c7c46620f59.exe
  • Size 831KB
  • Sample210505-p1a3z3bcfe
  • SHA256 50164e878b632fdf08b4f0de2060872ede8970238cbcfc55e32bfc1f81dfb4e2
  • 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\6c905b18c6865b7bfa638c7c46620f59.exe
    "C:\Users\Admin\AppData\Local\Temp\6c905b18c6865b7bfa638c7c46620f59.exe"
    1⤵
    • Adds Run key to start application
    • Modifies system certificate store
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious use of WriteProcessMemory
    PID:4652
    • C:\Windows\SysWOW64\icacls.exe
      icacls "C:\Users\Admin\AppData\Local\419a62d6-0187-4f93-82b4-c06bdf515dfa" /deny *S-1-1-0:(OI)(CI)(DE,DC)
      2⤵
      • Modifies file permissions
      PID:4260
    • C:\Users\Admin\AppData\Local\Temp\6c905b18c6865b7bfa638c7c46620f59.exe
      "C:\Users\Admin\AppData\Local\Temp\6c905b18c6865b7bfa638c7c46620f59.exe" --Admin IsNotAutoStart IsNotTask
      2⤵
      • Suspicious behavior: EnumeratesProcesses
      • Suspicious use of WriteProcessMemory
      PID:4276
      • C:\Users\Admin\AppData\Local\174491bd-0eef-48b5-83a0-9a6b0ea23068\updatewin1.exe
        "C:\Users\Admin\AppData\Local\174491bd-0eef-48b5-83a0-9a6b0ea23068\updatewin1.exe"
        3⤵
        • Executes dropped EXE
        • Suspicious use of WriteProcessMemory
        PID:1012
        • C:\Users\Admin\AppData\Local\174491bd-0eef-48b5-83a0-9a6b0ea23068\updatewin1.exe
          "C:\Users\Admin\AppData\Local\174491bd-0eef-48b5-83a0-9a6b0ea23068\updatewin1.exe" --Admin
          4⤵
          • Executes dropped EXE
          • Suspicious use of WriteProcessMemory
          PID:4400
          • C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
            powershell -Command Set-ExecutionPolicy -Scope CurrentUser RemoteSigned
            5⤵
            • Suspicious use of AdjustPrivilegeToken
            PID:2648
          • 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:4968
            • 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:2212
          • C:\Program Files\Windows Defender\mpcmdrun.exe
            "C:\Program Files\Windows Defender\mpcmdrun.exe" -removedefinitions -all
            5⤵
            • Deletes Windows Defender Definitions
            PID:4892
          • C:\Windows\SysWOW64\cmd.exe
            C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\delself.bat""
            5⤵
              PID:1216
        • C:\Users\Admin\AppData\Local\174491bd-0eef-48b5-83a0-9a6b0ea23068\updatewin2.exe
          "C:\Users\Admin\AppData\Local\174491bd-0eef-48b5-83a0-9a6b0ea23068\updatewin2.exe"
          3⤵
          • Drops file in Drivers directory
          • Executes dropped EXE
          PID:584
        • C:\Users\Admin\AppData\Local\174491bd-0eef-48b5-83a0-9a6b0ea23068\5.exe
          "C:\Users\Admin\AppData\Local\174491bd-0eef-48b5-83a0-9a6b0ea23068\5.exe"
          3⤵
          • Executes dropped EXE
          • Loads dropped DLL
          • Checks processor information in registry
          • Suspicious use of WriteProcessMemory
          PID:1384
          • C:\Windows\SysWOW64\WerFault.exe
            C:\Windows\SysWOW64\WerFault.exe -u -p 1384 -s 912
            4⤵
            • Program crash
            • Suspicious behavior: EnumeratesProcesses
            • Suspicious use of AdjustPrivilegeToken
            PID:1760
          • C:\Windows\SysWOW64\WerFault.exe
            C:\Windows\SysWOW64\WerFault.exe -u -p 1384 -s 916
            4⤵
            • Program crash
            • Suspicious behavior: EnumeratesProcesses
            • Suspicious use of AdjustPrivilegeToken
            PID:1508
          • C:\Windows\SysWOW64\WerFault.exe
            C:\Windows\SysWOW64\WerFault.exe -u -p 1384 -s 1076
            4⤵
            • Program crash
            • Suspicious behavior: EnumeratesProcesses
            • Suspicious use of AdjustPrivilegeToken
            PID:2340
          • C:\Windows\SysWOW64\WerFault.exe
            C:\Windows\SysWOW64\WerFault.exe -u -p 1384 -s 1080
            4⤵
            • Program crash
            • Suspicious behavior: EnumeratesProcesses
            • Suspicious use of AdjustPrivilegeToken
            PID:2504
          • C:\Windows\SysWOW64\WerFault.exe
            C:\Windows\SysWOW64\WerFault.exe -u -p 1384 -s 1060
            4⤵
            • Program crash
            • Suspicious behavior: EnumeratesProcesses
            • Suspicious use of AdjustPrivilegeToken
            PID:2672
          • C:\Windows\SysWOW64\WerFault.exe
            C:\Windows\SysWOW64\WerFault.exe -u -p 1384 -s 1136
            4⤵
            • Program crash
            • Suspicious use of AdjustPrivilegeToken
            PID:3004
          • C:\Windows\SysWOW64\WerFault.exe
            C:\Windows\SysWOW64\WerFault.exe -u -p 1384 -s 1420
            4⤵
            • Program crash
            • Suspicious use of AdjustPrivilegeToken
            PID:3060
          • C:\Windows\SysWOW64\WerFault.exe
            C:\Windows\SysWOW64\WerFault.exe -u -p 1384 -s 1460
            4⤵
            • Program crash
            • Suspicious use of AdjustPrivilegeToken
            PID:3632
          • C:\Windows\SysWOW64\WerFault.exe
            C:\Windows\SysWOW64\WerFault.exe -u -p 1384 -s 1424
            4⤵
            • Program crash
            • Suspicious use of AdjustPrivilegeToken
            PID:4304
          • C:\Windows\SysWOW64\WerFault.exe
            C:\Windows\SysWOW64\WerFault.exe -u -p 1384 -s 1712
            4⤵
            • Program crash
            • Suspicious use of AdjustPrivilegeToken
            PID:4312
          • C:\Windows\SysWOW64\WerFault.exe
            C:\Windows\SysWOW64\WerFault.exe -u -p 1384 -s 1444
            4⤵
            • Program crash
            • Suspicious use of AdjustPrivilegeToken
            PID:4008
          • C:\Windows\SysWOW64\WerFault.exe
            C:\Windows\SysWOW64\WerFault.exe -u -p 1384 -s 1588
            4⤵
            • Program crash
            • Suspicious use of AdjustPrivilegeToken
            PID:4416
          • C:\Windows\SysWOW64\WerFault.exe
            C:\Windows\SysWOW64\WerFault.exe -u -p 1384 -s 1728
            4⤵
            • Program crash
            • Suspicious use of AdjustPrivilegeToken
            PID:4428
          • C:\Windows\SysWOW64\WerFault.exe
            C:\Windows\SysWOW64\WerFault.exe -u -p 1384 -s 1960
            4⤵
            • Program crash
            • Suspicious use of AdjustPrivilegeToken
            PID:4408
          • 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\174491bd-0eef-48b5-83a0-9a6b0ea23068\5.exe" & del C:\ProgramData\*.dll & exit
            4⤵
            • Suspicious use of WriteProcessMemory
            PID:3928
            • C:\Windows\SysWOW64\taskkill.exe
              taskkill /im 5.exe /f
              5⤵
              • Kills process with taskkill
              • Suspicious use of AdjustPrivilegeToken
              PID:4592
            • C:\Windows\SysWOW64\timeout.exe
              timeout /t 6
              5⤵
              • Delays execution with timeout.exe
              PID:1532

    Network

          MITRE ATT&CK Enterprise v6

          Replay Monitor

          Loading Replay Monitor...

          Downloads

          memory/584-141-0x0000000000400000-0x000000000044D000-memory.dmp

          memory/1012-140-0x0000000000400000-0x000000000044D000-memory.dmp

          memory/1384-135-0x0000000000400000-0x00000000004B4000-memory.dmp

          memory/1384-134-0x00000000020E0000-0x0000000002177000-memory.dmp

          memory/2212-235-0x0000000007402000-0x0000000007403000-memory.dmp

          memory/2212-234-0x0000000007400000-0x0000000007401000-memory.dmp

          memory/2212-237-0x0000000007403000-0x0000000007404000-memory.dmp

          memory/2212-236-0x000000007EFE0000-0x000000007EFE1000-memory.dmp

          memory/2648-224-0x0000000007226000-0x0000000007228000-memory.dmp

          memory/2648-150-0x0000000007860000-0x0000000007861000-memory.dmp

          memory/2648-158-0x00000000085C0000-0x00000000085C1000-memory.dmp

          memory/2648-159-0x00000000088C0000-0x00000000088C1000-memory.dmp

          memory/2648-167-0x0000000009630000-0x0000000009663000-memory.dmp

          memory/2648-174-0x0000000009610000-0x0000000009611000-memory.dmp

          memory/2648-179-0x0000000009780000-0x0000000009781000-memory.dmp

          memory/2648-180-0x000000007EE20000-0x000000007EE21000-memory.dmp

          memory/2648-181-0x0000000009B40000-0x0000000009B41000-memory.dmp

          memory/2648-214-0x0000000007223000-0x0000000007224000-memory.dmp

          memory/2648-156-0x00000000081C0000-0x00000000081C1000-memory.dmp

          memory/2648-155-0x0000000008150000-0x0000000008151000-memory.dmp

          memory/2648-149-0x00000000050A0000-0x00000000050A1000-memory.dmp

          memory/2648-157-0x0000000008030000-0x0000000008031000-memory.dmp

          memory/2648-154-0x0000000007222000-0x0000000007223000-memory.dmp

          memory/2648-151-0x00000000075E0000-0x00000000075E1000-memory.dmp

          memory/2648-152-0x0000000007F00000-0x0000000007F01000-memory.dmp

          memory/2648-153-0x0000000007220000-0x0000000007221000-memory.dmp

          memory/4276-124-0x0000000000400000-0x00000000008C8000-memory.dmp

          memory/4400-147-0x0000000000400000-0x000000000044D000-memory.dmp

          memory/4652-115-0x0000000000400000-0x00000000008C8000-memory.dmp

          memory/4652-114-0x0000000002680000-0x000000000279A000-memory.dmp

          memory/4968-226-0x0000000004672000-0x0000000004673000-memory.dmp

          memory/4968-229-0x0000000004673000-0x0000000004674000-memory.dmp

          memory/4968-225-0x0000000004670000-0x0000000004671000-memory.dmp