Analysis

  • max time kernel
    70s
  • max time network
    137s
  • platform
    windows10_x64
  • resource
    win10v20210408
  • submitted
    08/06/2021, 06:32

General

  • Target
    3f355ae395b605682e8c759c50c3bdb3.exe
  • Size 809KB
  • Sample210608-vs6hfnycne
  • SHA256 d577b90e358071e4681e45d1b0d69d28d8671b1bc7200ddac5b6dab5b3482f66
  • MD5 SHA1 SHA512

Malware Config

Extracted

Family
  • vidar

Version
  • 39.3

Botnet
  • 517

C2
  • https://bandakere.tumblr.com

Attributes
  • profile_id

    517

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.

  • Vidar Stealer 4 IoCs
  • Disables Task Manager via registry modification
  • Downloads MZ/PE file
  • 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 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.

  • Suspicious use of SetThreadContext 3 IoCs
  • 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 64 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\3f355ae395b605682e8c759c50c3bdb3.exe
    "C:\Users\Admin\AppData\Local\Temp\3f355ae395b605682e8c759c50c3bdb3.exe"
    1⤵
    • Suspicious use of SetThreadContext
    • Suspicious use of WriteProcessMemory
    PID:648
    • C:\Users\Admin\AppData\Local\Temp\3f355ae395b605682e8c759c50c3bdb3.exe
      "C:\Users\Admin\AppData\Local\Temp\3f355ae395b605682e8c759c50c3bdb3.exe"
      2⤵
      • Adds Run key to start application
      • Modifies system certificate store
      • Suspicious behavior: EnumeratesProcesses
      • Suspicious use of WriteProcessMemory
      PID:2604
      • C:\Windows\SysWOW64\icacls.exe
        icacls "C:\Users\Admin\AppData\Local\6f8c7b35-ee87-4192-a36d-f8de69ac1d9d" /deny *S-1-1-0:(OI)(CI)(DE,DC)
        3⤵
        • Modifies file permissions
        PID:3380
      • C:\Users\Admin\AppData\Local\Temp\3f355ae395b605682e8c759c50c3bdb3.exe
        "C:\Users\Admin\AppData\Local\Temp\3f355ae395b605682e8c759c50c3bdb3.exe" --Admin IsNotAutoStart IsNotTask
        3⤵
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:192
        • C:\Users\Admin\AppData\Local\Temp\3f355ae395b605682e8c759c50c3bdb3.exe
          "C:\Users\Admin\AppData\Local\Temp\3f355ae395b605682e8c759c50c3bdb3.exe" --Admin IsNotAutoStart IsNotTask
          4⤵
          • Suspicious behavior: EnumeratesProcesses
          • Suspicious use of WriteProcessMemory
          PID:1284
          • C:\Users\Admin\AppData\Local\9784fe10-72a8-42d2-82a5-e1950bdb5ba6\updatewin1.exe
            "C:\Users\Admin\AppData\Local\9784fe10-72a8-42d2-82a5-e1950bdb5ba6\updatewin1.exe"
            5⤵
            • Executes dropped EXE
            • Suspicious use of WriteProcessMemory
            PID:1544
            • C:\Users\Admin\AppData\Local\9784fe10-72a8-42d2-82a5-e1950bdb5ba6\updatewin1.exe
              "C:\Users\Admin\AppData\Local\9784fe10-72a8-42d2-82a5-e1950bdb5ba6\updatewin1.exe" --Admin
              6⤵
              • Executes dropped EXE
              • Suspicious use of WriteProcessMemory
              PID:3664
              • C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
                powershell -Command Set-ExecutionPolicy -Scope CurrentUser RemoteSigned
                7⤵
                • Suspicious behavior: EnumeratesProcesses
                • Suspicious use of AdjustPrivilegeToken
                PID:2028
              • 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}"
                7⤵
                • Suspicious behavior: EnumeratesProcesses
                • Suspicious use of AdjustPrivilegeToken
                • Suspicious use of WriteProcessMemory
                PID:2680
                • 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
                  8⤵
                  • Suspicious behavior: EnumeratesProcesses
                  • Suspicious use of AdjustPrivilegeToken
                  PID:1612
              • C:\Program Files\Windows Defender\mpcmdrun.exe
                "C:\Program Files\Windows Defender\mpcmdrun.exe" -removedefinitions -all
                7⤵
                • Deletes Windows Defender Definitions
                PID:648
              • C:\Windows\SysWOW64\cmd.exe
                C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\delself.bat""
                7⤵
                  PID:4048
            • C:\Users\Admin\AppData\Local\9784fe10-72a8-42d2-82a5-e1950bdb5ba6\updatewin2.exe
              "C:\Users\Admin\AppData\Local\9784fe10-72a8-42d2-82a5-e1950bdb5ba6\updatewin2.exe"
              5⤵
              • Drops file in Drivers directory
              • Executes dropped EXE
              PID:3984
            • C:\Users\Admin\AppData\Local\9784fe10-72a8-42d2-82a5-e1950bdb5ba6\5.exe
              "C:\Users\Admin\AppData\Local\9784fe10-72a8-42d2-82a5-e1950bdb5ba6\5.exe"
              5⤵
              • Executes dropped EXE
              • Suspicious use of SetThreadContext
              • Suspicious use of WriteProcessMemory
              PID:3244
              • C:\Users\Admin\AppData\Local\9784fe10-72a8-42d2-82a5-e1950bdb5ba6\5.exe
                "C:\Users\Admin\AppData\Local\9784fe10-72a8-42d2-82a5-e1950bdb5ba6\5.exe"
                6⤵
                • Executes dropped EXE
                • Loads dropped DLL
                • Checks processor information in registry
                • Suspicious behavior: EnumeratesProcesses
                • Suspicious use of WriteProcessMemory
                PID:3884
                • 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\9784fe10-72a8-42d2-82a5-e1950bdb5ba6\5.exe" & del C:\ProgramData\*.dll & exit
                  7⤵
                  • Suspicious use of WriteProcessMemory
                  PID:1112
                  • C:\Windows\SysWOW64\taskkill.exe
                    taskkill /im 5.exe /f
                    8⤵
                    • Kills process with taskkill
                    • Suspicious use of AdjustPrivilegeToken
                    PID:3988
                  • C:\Windows\SysWOW64\timeout.exe
                    timeout /t 6
                    8⤵
                    • Delays execution with timeout.exe
                    PID:3128

    Network

          MITRE ATT&CK Enterprise v6

          Replay Monitor

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          Downloads

          memory/648-116-0x0000000002430000-0x000000000254B000-memory.dmp

          memory/1284-124-0x0000000000400000-0x0000000000537000-memory.dmp

          memory/1544-140-0x0000000000400000-0x000000000044D000-memory.dmp

          memory/1612-232-0x0000000004F40000-0x0000000004F41000-memory.dmp

          memory/1612-233-0x0000000004F42000-0x0000000004F43000-memory.dmp

          memory/1612-234-0x000000007F3A0000-0x000000007F3A1000-memory.dmp

          memory/1612-235-0x0000000004F43000-0x0000000004F44000-memory.dmp

          memory/2028-155-0x0000000000C20000-0x0000000000C21000-memory.dmp

          memory/2028-157-0x0000000006CD0000-0x0000000006CD1000-memory.dmp

          memory/2028-159-0x0000000006D70000-0x0000000006D71000-memory.dmp

          memory/2028-160-0x0000000007690000-0x0000000007691000-memory.dmp

          memory/2028-161-0x0000000007600000-0x0000000007601000-memory.dmp

          memory/2028-162-0x0000000007FA0000-0x0000000007FA1000-memory.dmp

          memory/2028-163-0x0000000007DB0000-0x0000000007DB1000-memory.dmp

          memory/2028-171-0x0000000008B20000-0x0000000008B53000-memory.dmp

          memory/2028-178-0x0000000008B00000-0x0000000008B01000-memory.dmp

          memory/2028-183-0x0000000008C70000-0x0000000008C71000-memory.dmp

          memory/2028-184-0x0000000009030000-0x0000000009031000-memory.dmp

          memory/2028-154-0x0000000006DF0000-0x0000000006DF1000-memory.dmp

          memory/2028-156-0x0000000000C22000-0x0000000000C23000-memory.dmp

          memory/2028-189-0x000000007EB70000-0x000000007EB71000-memory.dmp

          memory/2028-190-0x0000000000C23000-0x0000000000C24000-memory.dmp

          memory/2028-153-0x00000000045C0000-0x00000000045C1000-memory.dmp

          memory/2028-158-0x0000000007590000-0x0000000007591000-memory.dmp

          memory/2028-221-0x0000000000C26000-0x0000000000C28000-memory.dmp

          memory/2604-114-0x0000000000400000-0x0000000000537000-memory.dmp

          memory/2604-117-0x0000000000400000-0x0000000000537000-memory.dmp

          memory/2680-222-0x0000000006870000-0x0000000006871000-memory.dmp

          memory/2680-228-0x0000000006873000-0x0000000006874000-memory.dmp

          memory/2680-223-0x0000000006872000-0x0000000006873000-memory.dmp

          memory/3244-145-0x0000000000630000-0x00000000006C8000-memory.dmp

          memory/3664-149-0x0000000000400000-0x000000000044D000-memory.dmp

          memory/3884-141-0x0000000000400000-0x000000000049B000-memory.dmp

          memory/3884-146-0x0000000000400000-0x000000000049B000-memory.dmp

          memory/3984-144-0x0000000000400000-0x000000000044D000-memory.dmp