Analysis

  • max time kernel
    44s
  • max time network
    148s
  • platform
    windows7_x64
  • resource
    win7v20210410
  • submitted
    07/06/2021, 18:57

General

  • Target
    e2e69d2a14b7ae74e526f7c52f61d2b0.exe
  • Size 810KB
  • Sample210607-n7zp2sqlk6
  • SHA256 0003c4ac06a2ae23eff788a3ff179174f588fbf28e876621c64943aa5db072e8
  • 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 16 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 5 IoCs
  • Suspicious behavior: EnumeratesProcesses 14 IoCs
  • Suspicious use of AdjustPrivilegeToken 4 IoCs
  • Suspicious use of WriteProcessMemory 64 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\e2e69d2a14b7ae74e526f7c52f61d2b0.exe
    "C:\Users\Admin\AppData\Local\Temp\e2e69d2a14b7ae74e526f7c52f61d2b0.exe"
    1⤵
    • Suspicious use of SetThreadContext
    • Suspicious use of WriteProcessMemory
    PID:1640
    • C:\Users\Admin\AppData\Local\Temp\e2e69d2a14b7ae74e526f7c52f61d2b0.exe
      "C:\Users\Admin\AppData\Local\Temp\e2e69d2a14b7ae74e526f7c52f61d2b0.exe"
      2⤵
      • Adds Run key to start application
      • Modifies system certificate store
      • Suspicious behavior: EnumeratesProcesses
      • Suspicious use of WriteProcessMemory
      PID:1196
      • C:\Windows\SysWOW64\icacls.exe
        icacls "C:\Users\Admin\AppData\Local\b7c15427-e2a3-4f83-a946-dd8daf447bd1" /deny *S-1-1-0:(OI)(CI)(DE,DC)
        3⤵
        • Modifies file permissions
        PID:796
      • C:\Users\Admin\AppData\Local\Temp\e2e69d2a14b7ae74e526f7c52f61d2b0.exe
        "C:\Users\Admin\AppData\Local\Temp\e2e69d2a14b7ae74e526f7c52f61d2b0.exe" --Admin IsNotAutoStart IsNotTask
        3⤵
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:928
        • C:\Users\Admin\AppData\Local\Temp\e2e69d2a14b7ae74e526f7c52f61d2b0.exe
          "C:\Users\Admin\AppData\Local\Temp\e2e69d2a14b7ae74e526f7c52f61d2b0.exe" --Admin IsNotAutoStart IsNotTask
          4⤵
          • Loads dropped DLL
          • Modifies system certificate store
          • Suspicious behavior: EnumeratesProcesses
          • Suspicious use of WriteProcessMemory
          PID:1252
          • C:\Users\Admin\AppData\Local\42dcb126-b427-48fe-a716-19f9482f136c\updatewin1.exe
            "C:\Users\Admin\AppData\Local\42dcb126-b427-48fe-a716-19f9482f136c\updatewin1.exe"
            5⤵
            • Executes dropped EXE
            • Loads dropped DLL
            • Suspicious use of WriteProcessMemory
            PID:1760
            • C:\Users\Admin\AppData\Local\42dcb126-b427-48fe-a716-19f9482f136c\updatewin1.exe
              "C:\Users\Admin\AppData\Local\42dcb126-b427-48fe-a716-19f9482f136c\updatewin1.exe" --Admin
              6⤵
              • Executes dropped EXE
              • Loads dropped DLL
              • Suspicious use of WriteProcessMemory
              PID:616
              • C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
                powershell -Command Set-ExecutionPolicy -Scope CurrentUser RemoteSigned
                7⤵
                • Suspicious behavior: EnumeratesProcesses
                • Suspicious use of AdjustPrivilegeToken
                PID:1584
              • 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
                PID:1340
                • 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:1624
              • C:\Program Files\Windows Defender\mpcmdrun.exe
                "C:\Program Files\Windows Defender\mpcmdrun.exe" -removedefinitions -all
                7⤵
                • Deletes Windows Defender Definitions
                PID:2008
              • C:\Windows\SysWOW64\cmd.exe
                cmd /c ""C:\Users\Admin\AppData\Local\Temp\delself.bat""
                7⤵
                  PID:1484
            • C:\Users\Admin\AppData\Local\42dcb126-b427-48fe-a716-19f9482f136c\updatewin2.exe
              "C:\Users\Admin\AppData\Local\42dcb126-b427-48fe-a716-19f9482f136c\updatewin2.exe"
              5⤵
              • Drops file in Drivers directory
              • Executes dropped EXE
              PID:1108
            • C:\Users\Admin\AppData\Local\42dcb126-b427-48fe-a716-19f9482f136c\5.exe
              "C:\Users\Admin\AppData\Local\42dcb126-b427-48fe-a716-19f9482f136c\5.exe"
              5⤵
              • Executes dropped EXE
              • Suspicious use of SetThreadContext
              PID:740
              • C:\Users\Admin\AppData\Local\42dcb126-b427-48fe-a716-19f9482f136c\5.exe
                "C:\Users\Admin\AppData\Local\42dcb126-b427-48fe-a716-19f9482f136c\5.exe"
                6⤵
                • Executes dropped EXE
                • Loads dropped DLL
                • Checks processor information in registry
                • Suspicious behavior: EnumeratesProcesses
                PID:1832
                • 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\42dcb126-b427-48fe-a716-19f9482f136c\5.exe" & del C:\ProgramData\*.dll & exit
                  7⤵
                    PID:1340
                    • C:\Windows\SysWOW64\taskkill.exe
                      taskkill /im 5.exe /f
                      8⤵
                      • Kills process with taskkill
                      • Suspicious use of AdjustPrivilegeToken
                      PID:1776
                    • C:\Windows\SysWOW64\timeout.exe
                      timeout /t 6
                      8⤵
                      • Delays execution with timeout.exe
                      PID:388

      Network

            MITRE ATT&CK Enterprise v6

            Replay Monitor

            Loading Replay Monitor...

            Downloads

            memory/616-99-0x0000000000400000-0x000000000044D000-memory.dmp

            memory/740-185-0x0000000000220000-0x00000000002B8000-memory.dmp

            memory/1108-107-0x0000000000400000-0x000000000044D000-memory.dmp

            memory/1196-63-0x0000000000400000-0x0000000000537000-memory.dmp

            memory/1196-61-0x00000000766D1000-0x00000000766D3000-memory.dmp

            memory/1196-59-0x0000000000400000-0x0000000000537000-memory.dmp

            memory/1252-73-0x0000000000400000-0x0000000000537000-memory.dmp

            memory/1340-134-0x00000000028A0000-0x00000000028A1000-memory.dmp

            memory/1340-136-0x0000000005420000-0x0000000005421000-memory.dmp

            memory/1340-129-0x0000000001080000-0x0000000001081000-memory.dmp

            memory/1340-130-0x0000000004A30000-0x0000000004A31000-memory.dmp

            memory/1340-146-0x0000000006260000-0x0000000006261000-memory.dmp

            memory/1340-138-0x00000000026B0000-0x00000000032FA000-memory.dmp

            memory/1340-137-0x00000000026B0000-0x00000000032FA000-memory.dmp

            memory/1584-117-0x0000000006270000-0x0000000006271000-memory.dmp

            memory/1584-97-0x0000000000630000-0x0000000000631000-memory.dmp

            memory/1584-108-0x0000000005390000-0x0000000005391000-memory.dmp

            memory/1584-111-0x0000000005730000-0x0000000005731000-memory.dmp

            memory/1584-106-0x00000000024C0000-0x00000000024C1000-memory.dmp

            memory/1584-98-0x0000000004A20000-0x0000000004A21000-memory.dmp

            memory/1584-101-0x00000000049E2000-0x00000000049E3000-memory.dmp

            memory/1584-116-0x0000000005860000-0x0000000005861000-memory.dmp

            memory/1584-100-0x00000000049E0000-0x00000000049E1000-memory.dmp

            memory/1584-125-0x00000000063A0000-0x00000000063A1000-memory.dmp

            memory/1584-118-0x000000007EF30000-0x000000007EF31000-memory.dmp

            memory/1624-153-0x00000000027A0000-0x00000000027A1000-memory.dmp

            memory/1624-156-0x0000000004A30000-0x0000000004A31000-memory.dmp

            memory/1624-178-0x0000000006560000-0x0000000006561000-memory.dmp

            memory/1624-179-0x0000000006570000-0x0000000006571000-memory.dmp

            memory/1624-150-0x00000000010A0000-0x00000000010A1000-memory.dmp

            memory/1624-170-0x000000007EF20000-0x000000007EF21000-memory.dmp

            memory/1624-154-0x00000000049F0000-0x00000000049F1000-memory.dmp

            memory/1624-165-0x0000000005A20000-0x0000000005A21000-memory.dmp

            memory/1624-162-0x0000000005920000-0x0000000005921000-memory.dmp

            memory/1624-157-0x0000000004A32000-0x0000000004A33000-memory.dmp

            memory/1640-62-0x0000000001E50000-0x0000000001F6B000-memory.dmp

            memory/1760-94-0x0000000000400000-0x000000000044D000-memory.dmp

            memory/1832-181-0x0000000000400000-0x000000000049B000-memory.dmp

            memory/1832-186-0x0000000000400000-0x000000000049B000-memory.dmp