Analysis

  • max time kernel
    86s
  • max time network
    151s
  • platform
    windows10_x64
  • resource
    win10v20210408
  • 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 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\e2e69d2a14b7ae74e526f7c52f61d2b0.exe
    "C:\Users\Admin\AppData\Local\Temp\e2e69d2a14b7ae74e526f7c52f61d2b0.exe"
    1⤵
    • Suspicious use of SetThreadContext
    • Suspicious use of WriteProcessMemory
    PID:648
    • 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:2524
      • C:\Windows\SysWOW64\icacls.exe
        icacls "C:\Users\Admin\AppData\Local\369cfe4c-bdaf-454f-8dcb-db1dfec1670b" /deny *S-1-1-0:(OI)(CI)(DE,DC)
        3⤵
        • Modifies file permissions
        PID:188
      • 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:2836
        • C:\Users\Admin\AppData\Local\Temp\e2e69d2a14b7ae74e526f7c52f61d2b0.exe
          "C:\Users\Admin\AppData\Local\Temp\e2e69d2a14b7ae74e526f7c52f61d2b0.exe" --Admin IsNotAutoStart IsNotTask
          4⤵
          • Suspicious behavior: EnumeratesProcesses
          • Suspicious use of WriteProcessMemory
          PID:1512
          • C:\Users\Admin\AppData\Local\bbb48b9f-ccf3-4cb5-9645-f3f1951e73f2\updatewin1.exe
            "C:\Users\Admin\AppData\Local\bbb48b9f-ccf3-4cb5-9645-f3f1951e73f2\updatewin1.exe"
            5⤵
            • Executes dropped EXE
            • Suspicious use of WriteProcessMemory
            PID:3228
            • C:\Users\Admin\AppData\Local\bbb48b9f-ccf3-4cb5-9645-f3f1951e73f2\updatewin1.exe
              "C:\Users\Admin\AppData\Local\bbb48b9f-ccf3-4cb5-9645-f3f1951e73f2\updatewin1.exe" --Admin
              6⤵
              • Executes dropped EXE
              • Suspicious use of WriteProcessMemory
              PID:3268
              • C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
                powershell -Command Set-ExecutionPolicy -Scope CurrentUser RemoteSigned
                7⤵
                • Suspicious behavior: EnumeratesProcesses
                • Suspicious use of AdjustPrivilegeToken
                PID:3920
              • 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:868
                • 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:3244
              • C:\Program Files\Windows Defender\mpcmdrun.exe
                "C:\Program Files\Windows Defender\mpcmdrun.exe" -removedefinitions -all
                7⤵
                • Deletes Windows Defender Definitions
                PID:2012
              • C:\Windows\SysWOW64\cmd.exe
                C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\delself.bat""
                7⤵
                  PID:3668
            • C:\Users\Admin\AppData\Local\bbb48b9f-ccf3-4cb5-9645-f3f1951e73f2\updatewin2.exe
              "C:\Users\Admin\AppData\Local\bbb48b9f-ccf3-4cb5-9645-f3f1951e73f2\updatewin2.exe"
              5⤵
              • Drops file in Drivers directory
              • Executes dropped EXE
              PID:1004
            • C:\Users\Admin\AppData\Local\bbb48b9f-ccf3-4cb5-9645-f3f1951e73f2\5.exe
              "C:\Users\Admin\AppData\Local\bbb48b9f-ccf3-4cb5-9645-f3f1951e73f2\5.exe"
              5⤵
              • Executes dropped EXE
              • Suspicious use of SetThreadContext
              • Suspicious use of WriteProcessMemory
              PID:3140
              • C:\Users\Admin\AppData\Local\bbb48b9f-ccf3-4cb5-9645-f3f1951e73f2\5.exe
                "C:\Users\Admin\AppData\Local\bbb48b9f-ccf3-4cb5-9645-f3f1951e73f2\5.exe"
                6⤵
                • Executes dropped EXE
                • Loads dropped DLL
                • Checks processor information in registry
                • Suspicious behavior: EnumeratesProcesses
                • Suspicious use of WriteProcessMemory
                PID:3104
                • 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\bbb48b9f-ccf3-4cb5-9645-f3f1951e73f2\5.exe" & del C:\ProgramData\*.dll & exit
                  7⤵
                  • Suspicious use of WriteProcessMemory
                  PID:3744
                  • C:\Windows\SysWOW64\taskkill.exe
                    taskkill /im 5.exe /f
                    8⤵
                    • Kills process with taskkill
                    • Suspicious use of AdjustPrivilegeToken
                    PID:2000
                  • C:\Windows\SysWOW64\timeout.exe
                    timeout /t 6
                    8⤵
                    • Delays execution with timeout.exe
                    PID:1208

    Network

          MITRE ATT&CK Enterprise v6

          Replay Monitor

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          Downloads

          memory/648-116-0x00000000022E0000-0x00000000023FB000-memory.dmp

          memory/868-223-0x0000000007530000-0x0000000007531000-memory.dmp

          memory/868-229-0x0000000007533000-0x0000000007534000-memory.dmp

          memory/868-224-0x0000000007532000-0x0000000007533000-memory.dmp

          memory/1004-141-0x0000000000400000-0x000000000044D000-memory.dmp

          memory/1512-128-0x0000000000400000-0x0000000000537000-memory.dmp

          memory/2524-114-0x0000000000400000-0x0000000000537000-memory.dmp

          memory/2524-117-0x0000000000400000-0x0000000000537000-memory.dmp

          memory/3104-143-0x0000000000400000-0x000000000049B000-memory.dmp

          memory/3104-146-0x0000000000400000-0x000000000049B000-memory.dmp

          memory/3140-142-0x0000000002160000-0x00000000021F8000-memory.dmp

          memory/3228-140-0x0000000000400000-0x000000000044D000-memory.dmp

          memory/3244-235-0x0000000007263000-0x0000000007264000-memory.dmp

          memory/3244-230-0x0000000007260000-0x0000000007261000-memory.dmp

          memory/3244-231-0x0000000007262000-0x0000000007263000-memory.dmp

          memory/3244-234-0x000000007F270000-0x000000007F271000-memory.dmp

          memory/3268-148-0x0000000000400000-0x000000000044D000-memory.dmp

          memory/3920-154-0x0000000004BF0000-0x0000000004BF1000-memory.dmp

          memory/3920-222-0x0000000004BF6000-0x0000000004BF8000-memory.dmp

          memory/3920-186-0x00000000095C0000-0x00000000095C1000-memory.dmp

          memory/3920-184-0x000000007E9E0000-0x000000007E9E1000-memory.dmp

          memory/3920-185-0x0000000004BF3000-0x0000000004BF4000-memory.dmp

          memory/3920-183-0x0000000009400000-0x0000000009401000-memory.dmp

          memory/3920-178-0x0000000009090000-0x0000000009091000-memory.dmp

          memory/3920-171-0x00000000090B0000-0x00000000090E3000-memory.dmp

          memory/3920-163-0x0000000008310000-0x0000000008311000-memory.dmp

          memory/3920-162-0x00000000085A0000-0x00000000085A1000-memory.dmp

          memory/3920-161-0x0000000008000000-0x0000000008001000-memory.dmp

          memory/3920-160-0x0000000007B30000-0x0000000007B31000-memory.dmp

          memory/3920-159-0x0000000007AC0000-0x0000000007AC1000-memory.dmp

          memory/3920-158-0x0000000007950000-0x0000000007951000-memory.dmp

          memory/3920-157-0x00000000078B0000-0x00000000078B1000-memory.dmp

          memory/3920-156-0x0000000004BF2000-0x0000000004BF3000-memory.dmp

          memory/3920-155-0x0000000007250000-0x0000000007251000-memory.dmp

          memory/3920-153-0x0000000004B30000-0x0000000004B31000-memory.dmp