Analysis

  • max time kernel
    67s
  • max time network
    137s
  • platform
    windows10_x64
  • resource
    win10v20210408
  • submitted
    10/06/2021, 13:07

General

  • Target
    6b7829cb6f27c9382e48822f36ce2b03.exe
  • Size 859KB
  • Sample210610-e44hxmegjs
  • SHA256 3e4676b65c821a9509ba52b43e12248a75cc8f68b212d9852786cc6424003d60
  • 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\6b7829cb6f27c9382e48822f36ce2b03.exe
    "C:\Users\Admin\AppData\Local\Temp\6b7829cb6f27c9382e48822f36ce2b03.exe"
    1⤵
    • Suspicious use of SetThreadContext
    • Suspicious use of WriteProcessMemory
    PID:808
    • C:\Users\Admin\AppData\Local\Temp\6b7829cb6f27c9382e48822f36ce2b03.exe
      "C:\Users\Admin\AppData\Local\Temp\6b7829cb6f27c9382e48822f36ce2b03.exe"
      2⤵
      • Adds Run key to start application
      • Modifies system certificate store
      • Suspicious behavior: EnumeratesProcesses
      • Suspicious use of WriteProcessMemory
      PID:508
      • C:\Windows\SysWOW64\icacls.exe
        icacls "C:\Users\Admin\AppData\Local\c8477f60-c24f-4e5a-875d-a35815768079" /deny *S-1-1-0:(OI)(CI)(DE,DC)
        3⤵
        • Modifies file permissions
        PID:936
      • C:\Users\Admin\AppData\Local\Temp\6b7829cb6f27c9382e48822f36ce2b03.exe
        "C:\Users\Admin\AppData\Local\Temp\6b7829cb6f27c9382e48822f36ce2b03.exe" --Admin IsNotAutoStart IsNotTask
        3⤵
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:4016
        • C:\Users\Admin\AppData\Local\Temp\6b7829cb6f27c9382e48822f36ce2b03.exe
          "C:\Users\Admin\AppData\Local\Temp\6b7829cb6f27c9382e48822f36ce2b03.exe" --Admin IsNotAutoStart IsNotTask
          4⤵
          • Suspicious behavior: EnumeratesProcesses
          • Suspicious use of WriteProcessMemory
          PID:2168
          • C:\Users\Admin\AppData\Local\2262827b-78e3-499e-8921-6d66d28a0c54\updatewin1.exe
            "C:\Users\Admin\AppData\Local\2262827b-78e3-499e-8921-6d66d28a0c54\updatewin1.exe"
            5⤵
            • Executes dropped EXE
            • Suspicious use of WriteProcessMemory
            PID:3916
            • C:\Users\Admin\AppData\Local\2262827b-78e3-499e-8921-6d66d28a0c54\updatewin1.exe
              "C:\Users\Admin\AppData\Local\2262827b-78e3-499e-8921-6d66d28a0c54\updatewin1.exe" --Admin
              6⤵
              • Executes dropped EXE
              • Suspicious use of WriteProcessMemory
              PID:812
              • C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
                powershell -Command Set-ExecutionPolicy -Scope CurrentUser RemoteSigned
                7⤵
                • Suspicious behavior: EnumeratesProcesses
                • Suspicious use of AdjustPrivilegeToken
                PID:3052
              • 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:1780
                • 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:1036
              • C:\Program Files\Windows Defender\mpcmdrun.exe
                "C:\Program Files\Windows Defender\mpcmdrun.exe" -removedefinitions -all
                7⤵
                • Deletes Windows Defender Definitions
                PID:2268
              • C:\Windows\SysWOW64\cmd.exe
                C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\delself.bat""
                7⤵
                  PID:1276
            • C:\Users\Admin\AppData\Local\2262827b-78e3-499e-8921-6d66d28a0c54\updatewin2.exe
              "C:\Users\Admin\AppData\Local\2262827b-78e3-499e-8921-6d66d28a0c54\updatewin2.exe"
              5⤵
              • Drops file in Drivers directory
              • Executes dropped EXE
              PID:2360
            • C:\Users\Admin\AppData\Local\2262827b-78e3-499e-8921-6d66d28a0c54\5.exe
              "C:\Users\Admin\AppData\Local\2262827b-78e3-499e-8921-6d66d28a0c54\5.exe"
              5⤵
              • Executes dropped EXE
              • Suspicious use of SetThreadContext
              • Suspicious use of WriteProcessMemory
              PID:1780
              • C:\Users\Admin\AppData\Local\2262827b-78e3-499e-8921-6d66d28a0c54\5.exe
                "C:\Users\Admin\AppData\Local\2262827b-78e3-499e-8921-6d66d28a0c54\5.exe"
                6⤵
                • Executes dropped EXE
                • Loads dropped DLL
                • Checks processor information in registry
                • Suspicious behavior: EnumeratesProcesses
                • Suspicious use of WriteProcessMemory
                PID:1868
                • 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\2262827b-78e3-499e-8921-6d66d28a0c54\5.exe" & del C:\ProgramData\*.dll & exit
                  7⤵
                  • Suspicious use of WriteProcessMemory
                  PID:1296
                  • C:\Windows\SysWOW64\taskkill.exe
                    taskkill /im 5.exe /f
                    8⤵
                    • Kills process with taskkill
                    • Suspicious use of AdjustPrivilegeToken
                    PID:3716
                  • C:\Windows\SysWOW64\timeout.exe
                    timeout /t 6
                    8⤵
                    • Delays execution with timeout.exe
                    PID:1292

    Network

          MITRE ATT&CK Enterprise v6

          Replay Monitor

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          Downloads

          memory/508-114-0x0000000000400000-0x0000000000537000-memory.dmp

          memory/508-117-0x0000000000400000-0x0000000000537000-memory.dmp

          memory/808-116-0x0000000002240000-0x000000000235B000-memory.dmp

          memory/812-152-0x0000000000400000-0x000000000044D000-memory.dmp

          memory/1036-235-0x00000000047B3000-0x00000000047B4000-memory.dmp

          memory/1036-234-0x000000007E960000-0x000000007E961000-memory.dmp

          memory/1036-231-0x00000000047B0000-0x00000000047B1000-memory.dmp

          memory/1036-232-0x00000000047B2000-0x00000000047B3000-memory.dmp

          memory/1780-225-0x0000000006A13000-0x0000000006A14000-memory.dmp

          memory/1780-220-0x0000000006A10000-0x0000000006A11000-memory.dmp

          memory/1780-221-0x0000000006A12000-0x0000000006A13000-memory.dmp

          memory/1780-145-0x0000000002090000-0x0000000002128000-memory.dmp

          memory/1868-142-0x0000000000400000-0x000000000049B000-memory.dmp

          memory/1868-146-0x0000000000400000-0x000000000049B000-memory.dmp

          memory/2168-124-0x0000000000400000-0x0000000000537000-memory.dmp

          memory/2360-141-0x0000000000400000-0x000000000044D000-memory.dmp

          memory/3052-157-0x0000000006EE0000-0x0000000006EE1000-memory.dmp

          memory/3052-158-0x00000000079B0000-0x00000000079B1000-memory.dmp

          memory/3052-215-0x0000000006AF3000-0x0000000006AF4000-memory.dmp

          memory/3052-150-0x0000000006A00000-0x0000000006A01000-memory.dmp

          memory/3052-185-0x0000000009430000-0x0000000009431000-memory.dmp

          memory/3052-184-0x000000007EBE0000-0x000000007EBE1000-memory.dmp

          memory/3052-183-0x0000000009270000-0x0000000009271000-memory.dmp

          memory/3052-178-0x0000000008F00000-0x0000000008F01000-memory.dmp

          memory/3052-171-0x0000000008F20000-0x0000000008F53000-memory.dmp

          memory/3052-163-0x0000000008170000-0x0000000008171000-memory.dmp

          memory/3052-151-0x0000000007130000-0x0000000007131000-memory.dmp

          memory/3052-162-0x0000000008420000-0x0000000008421000-memory.dmp

          memory/3052-161-0x0000000007D70000-0x0000000007D71000-memory.dmp

          memory/3052-160-0x0000000007A20000-0x0000000007A21000-memory.dmp

          memory/3052-159-0x00000000077D0000-0x00000000077D1000-memory.dmp

          memory/3052-219-0x0000000006AF6000-0x0000000006AF8000-memory.dmp

          memory/3052-153-0x0000000006AF0000-0x0000000006AF1000-memory.dmp

          memory/3052-154-0x0000000006AF2000-0x0000000006AF3000-memory.dmp

          memory/3916-139-0x0000000000400000-0x000000000044D000-memory.dmp