Analysis

  • max time kernel
    80s
  • max time network
    149s
  • platform
    windows10_x64
  • resource
    win10v20210408
  • submitted
    08/06/2021, 07:09

General

  • Target
    9df2a0977fde90af161aaf7a14457c14.exe
  • Size 871KB
  • Sample210608-gn3hbycebe
  • SHA256 7a2f648caf2fab403fc84e7c5a3f0d89e52e8f3b0c2492a26588f094e5981c9b
  • 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.

  • 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
  • Modifies file permissions 1 TTPs 1 IoCs
  • Adds Run key to start application 2 TTPs 1 IoCs
  • 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.

  • Program crash 1 IoCs
  • Modifies system certificate store 2 TTPs 2 IoCs
  • Suspicious behavior: EnumeratesProcesses 30 IoCs
  • Suspicious use of AdjustPrivilegeToken 6 IoCs
  • Suspicious use of WriteProcessMemory 60 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\9df2a0977fde90af161aaf7a14457c14.exe
    "C:\Users\Admin\AppData\Local\Temp\9df2a0977fde90af161aaf7a14457c14.exe"
    1⤵
    • Suspicious use of SetThreadContext
    • Suspicious use of WriteProcessMemory
    PID:744
    • C:\Users\Admin\AppData\Local\Temp\9df2a0977fde90af161aaf7a14457c14.exe
      "C:\Users\Admin\AppData\Local\Temp\9df2a0977fde90af161aaf7a14457c14.exe"
      2⤵
      • Adds Run key to start application
      • Modifies system certificate store
      • Suspicious behavior: EnumeratesProcesses
      • Suspicious use of WriteProcessMemory
      PID:2376
      • C:\Windows\SysWOW64\icacls.exe
        icacls "C:\Users\Admin\AppData\Local\d6fc4eda-b46f-4e4e-936c-1b3f9fdfde9d" /deny *S-1-1-0:(OI)(CI)(DE,DC)
        3⤵
        • Modifies file permissions
        PID:1356
      • C:\Users\Admin\AppData\Local\Temp\9df2a0977fde90af161aaf7a14457c14.exe
        "C:\Users\Admin\AppData\Local\Temp\9df2a0977fde90af161aaf7a14457c14.exe" --Admin IsNotAutoStart IsNotTask
        3⤵
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:2148
        • C:\Users\Admin\AppData\Local\Temp\9df2a0977fde90af161aaf7a14457c14.exe
          "C:\Users\Admin\AppData\Local\Temp\9df2a0977fde90af161aaf7a14457c14.exe" --Admin IsNotAutoStart IsNotTask
          4⤵
          • Suspicious behavior: EnumeratesProcesses
          • Suspicious use of WriteProcessMemory
          PID:2580
          • C:\Users\Admin\AppData\Local\72bd371f-f2bb-4337-8d0f-66597ac2e70f\updatewin1.exe
            "C:\Users\Admin\AppData\Local\72bd371f-f2bb-4337-8d0f-66597ac2e70f\updatewin1.exe"
            5⤵
            • Executes dropped EXE
            • Suspicious use of WriteProcessMemory
            PID:1372
            • C:\Users\Admin\AppData\Local\72bd371f-f2bb-4337-8d0f-66597ac2e70f\updatewin1.exe
              "C:\Users\Admin\AppData\Local\72bd371f-f2bb-4337-8d0f-66597ac2e70f\updatewin1.exe" --Admin
              6⤵
              • Executes dropped EXE
              • Suspicious use of WriteProcessMemory
              PID:3068
              • C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
                powershell -Command Set-ExecutionPolicy -Scope CurrentUser RemoteSigned
                7⤵
                • Suspicious behavior: EnumeratesProcesses
                • Suspicious use of AdjustPrivilegeToken
                PID:2616
              • 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:2740
                • 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:2320
              • C:\Program Files\Windows Defender\mpcmdrun.exe
                "C:\Program Files\Windows Defender\mpcmdrun.exe" -removedefinitions -all
                7⤵
                • Deletes Windows Defender Definitions
                PID:2384
              • C:\Windows\SysWOW64\cmd.exe
                C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\delself.bat""
                7⤵
                  PID:1916
            • C:\Users\Admin\AppData\Local\72bd371f-f2bb-4337-8d0f-66597ac2e70f\updatewin2.exe
              "C:\Users\Admin\AppData\Local\72bd371f-f2bb-4337-8d0f-66597ac2e70f\updatewin2.exe"
              5⤵
              • Drops file in Drivers directory
              • Executes dropped EXE
              PID:1752
            • C:\Users\Admin\AppData\Local\72bd371f-f2bb-4337-8d0f-66597ac2e70f\5.exe
              "C:\Users\Admin\AppData\Local\72bd371f-f2bb-4337-8d0f-66597ac2e70f\5.exe"
              5⤵
              • Executes dropped EXE
              • Suspicious use of SetThreadContext
              • Suspicious use of WriteProcessMemory
              PID:960
              • C:\Users\Admin\AppData\Local\72bd371f-f2bb-4337-8d0f-66597ac2e70f\5.exe
                "C:\Users\Admin\AppData\Local\72bd371f-f2bb-4337-8d0f-66597ac2e70f\5.exe"
                6⤵
                • Executes dropped EXE
                PID:1492
                • C:\Windows\SysWOW64\WerFault.exe
                  C:\Windows\SysWOW64\WerFault.exe -u -p 1492 -s 1144
                  7⤵
                  • Program crash
                  • Suspicious behavior: EnumeratesProcesses
                  • Suspicious use of AdjustPrivilegeToken
                  PID:2560

    Network

          MITRE ATT&CK Enterprise v6

          Replay Monitor

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          Downloads

          memory/744-114-0x0000000002450000-0x000000000256B000-memory.dmp

          memory/960-145-0x00000000020B0000-0x0000000002148000-memory.dmp

          memory/1372-138-0x0000000000400000-0x000000000044D000-memory.dmp

          memory/1492-146-0x0000000000400000-0x000000000049B000-memory.dmp

          memory/1492-142-0x0000000000400000-0x000000000049B000-memory.dmp

          memory/1752-141-0x0000000000400000-0x000000000044D000-memory.dmp

          memory/2320-225-0x0000000006D00000-0x0000000006D01000-memory.dmp

          memory/2320-230-0x0000000006D03000-0x0000000006D04000-memory.dmp

          memory/2320-229-0x000000007EC30000-0x000000007EC31000-memory.dmp

          memory/2320-226-0x0000000006D02000-0x0000000006D03000-memory.dmp

          memory/2376-115-0x0000000000400000-0x0000000000537000-memory.dmp

          memory/2376-117-0x0000000000400000-0x0000000000537000-memory.dmp

          memory/2580-128-0x0000000000400000-0x0000000000537000-memory.dmp

          memory/2616-151-0x0000000004750000-0x0000000004751000-memory.dmp

          memory/2616-154-0x0000000004C82000-0x0000000004C83000-memory.dmp

          memory/2616-169-0x0000000009010000-0x0000000009043000-memory.dmp

          memory/2616-176-0x0000000008FF0000-0x0000000008FF1000-memory.dmp

          memory/2616-181-0x0000000009370000-0x0000000009371000-memory.dmp

          memory/2616-182-0x0000000009530000-0x0000000009531000-memory.dmp

          memory/2616-213-0x0000000004C83000-0x0000000004C84000-memory.dmp

          memory/2616-212-0x000000007E1C0000-0x000000007E1C1000-memory.dmp

          memory/2616-160-0x0000000008310000-0x0000000008311000-memory.dmp

          memory/2616-159-0x0000000007360000-0x0000000007361000-memory.dmp

          memory/2616-217-0x0000000004C86000-0x0000000004C88000-memory.dmp

          memory/2616-152-0x0000000004C80000-0x0000000004C81000-memory.dmp

          memory/2616-153-0x0000000007380000-0x0000000007381000-memory.dmp

          memory/2616-158-0x0000000007B20000-0x0000000007B21000-memory.dmp

          memory/2616-157-0x0000000007AB0000-0x0000000007AB1000-memory.dmp

          memory/2616-156-0x0000000007200000-0x0000000007201000-memory.dmp

          memory/2616-155-0x00000000072B0000-0x00000000072B1000-memory.dmp

          memory/2616-161-0x0000000008290000-0x0000000008291000-memory.dmp

          memory/2740-224-0x00000000065B3000-0x00000000065B4000-memory.dmp

          memory/2740-219-0x00000000065B2000-0x00000000065B3000-memory.dmp

          memory/2740-218-0x00000000065B0000-0x00000000065B1000-memory.dmp

          memory/3068-148-0x0000000000400000-0x000000000044D000-memory.dmp