Analysis

  • max time kernel
    1188s
  • max time network
    1199s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20240226-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20240226-enlocale:en-usos:windows10-2004-x64system
  • submitted
    09/04/2024, 13:34

General

  • Target
    14052163e50c197697c64b143.exe
  • Size 17.6MB
  • Sample240409-qvk6aabe81
  • SHA256 4e0ddcd303f27c01dcc8a35a9bd821c53fb7dcca474ac7f0c84d3c6451e9f778
  • MD5 SHA1 SHA512 SSDEEP

Malware Config

Extracted

Family
  • strrat

C2
  • rar.ydns.eu:9999

  • svchost.ydns.eu:10000

Attributes
  • license_id

    khonsari

  • plugins_url

    http://jbfrost.live/strigoi/server/?hwid=1&lid=m&ht=5

  • scheduled_task

    false

  • secondary_startup

    false

  • startup

    true

Signatures

  • STRRAT

    STRRAT is a remote access tool than can steal credentials and log keystrokes.

  • Identifies VirtualBox via ACPI registry values (likely anti-VM) 2 TTPs 1 IoCs
  • Blocklisted process makes network request 38 IoCs
  • Checks BIOS information in registry 2 TTPs 2 IoCs

    BIOS information is often read in order to detect sandboxing environments.

  • Checks computer location settings 2 TTPs 4 IoCs

    Looks up country code configured in the registry, likely geofence.

  • Drops startup file 2 IoCs
  • Executes dropped EXE 2 IoCs
  • Identifies Wine through registry keys 2 TTPs 1 IoCs

    Wine is a compatibility layer capable of running Windows applications, which can be used as sandboxing environment.

  • Modifies file permissions 1 TTPs 1 IoCs
  • Adds Run key to start application 2 TTPs 4 IoCs
  • Looks up external IP address via web service 1 IoCs

    Uses a legitimate IP lookup service to find the infected system's external IP.

  • AutoIT Executable 1 IoCs

    AutoIT scripts compiled to PE executables.

  • Drops file in Program Files directory 12 IoCs
  • Enumerates physical storage devices 1 TTPs

    Attempts to interact with connected storage/optical drive(s).

  • Delays execution with timeout.exe 1 IoCs
  • Modifies registry class 1 IoCs
  • Suspicious behavior: EnumeratesProcesses 2 IoCs
  • Suspicious use of AdjustPrivilegeToken 1 IoCs
  • Suspicious use of FindShellTrayWindow 3 IoCs
  • Suspicious use of SendNotifyMessage 3 IoCs
  • Suspicious use of SetWindowsHookEx 1 IoCs
  • Suspicious use of WriteProcessMemory 31 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\14052163e50c197697c64b143.exe
    "C:\Users\Admin\AppData\Local\Temp\14052163e50c197697c64b143.exe"
    1⤵
    • Checks computer location settings
    • Modifies registry class
    • Suspicious use of WriteProcessMemory
    PID:1488
    • C:\Windows\SysWOW64\WScript.exe
      "C:\Windows\System32\WScript.exe" "C:\Users\Admin\AppData\Local\Temp\Antimalware Service Executable.JS"
      2⤵
      • Checks computer location settings
      • Drops startup file
      • Adds Run key to start application
      • Suspicious use of WriteProcessMemory
      PID:3400
      • C:\Windows\SysWOW64\wscript.exe
        "C:\Windows\System32\wscript.exe" //B "C:\Users\Admin\AppData\Roaming\Antimalware Service Executable.JS"
        3⤵
        • Blocklisted process makes network request
        • Drops startup file
        • Adds Run key to start application
        PID:1576
    • C:\Windows\SysWOW64\WScript.exe
      "C:\Windows\System32\WScript.exe" "C:\Users\Admin\AppData\Local\Temp\MsMpEng.js"
      2⤵
      • Checks computer location settings
      • Suspicious use of WriteProcessMemory
      PID:2956
      • C:\Users\Admin\AppData\Local\Temp\x.exe
        "C:\Users\Admin\AppData\Local\Temp\x.exe"
        3⤵
        • Identifies VirtualBox via ACPI registry values (likely anti-VM)
        • Checks BIOS information in registry
        • Executes dropped EXE
        • Identifies Wine through registry keys
        • Suspicious use of FindShellTrayWindow
        • Suspicious use of SendNotifyMessage
        • Suspicious use of WriteProcessMemory
        PID:3096
        • C:\Windows\SysWOW64\cmd.exe
          C:\Windows\system32\cmd.exe /c For /L %i In (0,0,0) Do (del "C:\Users\Admin\AppData\Local\Temp\x.exe"&&timeout /t 0&&if not exist "C:\Users\Admin\AppData\Local\Temp\x.exe" exit)
          4⤵
          • Suspicious use of WriteProcessMemory
          PID:2204
          • C:\Windows\SysWOW64\timeout.exe
            timeout /t 0
            5⤵
            • Delays execution with timeout.exe
            PID:4772
    • C:\Windows\SysWOW64\WScript.exe
      "C:\Windows\System32\WScript.exe" "C:\Users\Admin\AppData\Local\Temp\Windows Driver Foundation.vbs"
      2⤵
      • Checks computer location settings
      • Suspicious use of WriteProcessMemory
      PID:2184
      • C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
        "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -executionpolicy remotesigned -File "C:\ProgramData\rrrrrrrr.ps1"
        3⤵
        • Suspicious behavior: EnumeratesProcesses
        • Suspicious use of AdjustPrivilegeToken
        PID:3920
    • C:\Program Files\Java\jre-1.8\bin\javaw.exe
      "C:\Program Files\Java\jre-1.8\bin\javaw.exe" -jar "C:\Users\Admin\AppData\Local\Temp\Java Install.jar"
      2⤵
      • Drops file in Program Files directory
      • Suspicious use of WriteProcessMemory
      PID:3768
      • C:\Windows\system32\icacls.exe
        C:\Windows\system32\icacls.exe C:\ProgramData\Oracle\Java\.oracle_jre_usage /grant "everyone":(OI)(CI)M
        3⤵
        • Modifies file permissions
        PID:2044
    • C:\Users\Admin\AppData\Local\Temp\EmbraTor Mac Smash Bullet.exe
      "C:\Users\Admin\AppData\Local\Temp\EmbraTor Mac Smash Bullet.exe"
      2⤵
      • Executes dropped EXE
      • Suspicious use of SetWindowsHookEx
      PID:4992

Network

        MITRE ATT&CK Enterprise v15

        Replay Monitor

        Loading Replay Monitor...

        Downloads

        3903daac9bc4a3b7.timestamp

        • Path C:\ProgramData\Oracle\Java\.oracle_jre_usage\3903daac9bc4a3b7.timestamp
        • Size 46B
        • SHA256 d160aa7aa671ea669b0ff99581f7011206cf977277e5e904ab566b0756c47b7c
        • MD5 SHA1 SHA512

        Antimalware Service Executable.JS

        • Path C:\Users\Admin\AppData\Local\Temp\Antimalware Service Executable.JS
        • Size 713KB
        • SHA256 e3a33757c2e596f7ee50a4a41ff58f2e64dbdb062257fe5749ca19b955b0baaf
        • MD5 SHA1 SHA512 SSDEEP

        EmbraTor Mac Smash Bullet.exe

        • Path C:\Users\Admin\AppData\Local\Temp\EmbraTor Mac Smash Bullet.exe
        • Size 1012KB
        • SHA256 3863d2cab19dba2988e33810d9235e0f04aee019b696e4fdf4cf637b3072b19d
        • MD5 SHA1 SHA512 SSDEEP

        Java Install.jar

        • Path C:\Users\Admin\AppData\Local\Temp\Java Install.jar
        • Size 92KB
        • SHA256 16ed7004aa68efab0eda75b3f9bff11508365a4224ef859c91f93029bc441284
        • MD5 SHA1 SHA512 SSDEEP

        MsMpEng.js

        • Path C:\Users\Admin\AppData\Local\Temp\MsMpEng.js
        • Size 24.2MB
        • SHA256 b27dd5407a22c8df93090fbc1a3eb93c6461f4a279cfabd87b4b21e246bda458
        • MD5 SHA1 SHA512 SSDEEP

        Windows Driver Foundation.vbs

        • Path C:\Users\Admin\AppData\Local\Temp\Windows Driver Foundation.vbs
        • Size 984B
        • SHA256 2c5907389d374ed9efb86194a7f0f954349c93a7bc67b99c3d6b59bfc0d8296c
        • MD5 SHA1 SHA512

        __PSScriptPolicyTest_4r4gd1uh.xxe.ps1

        • Path C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_4r4gd1uh.xxe.ps1
        • Size 60B
        • SHA256 96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7
        • MD5 SHA1 SHA512

        x.exe

        • Path C:\Users\Admin\AppData\Local\Temp\x.exe
        • Size 18.1MB
        • SHA256 41686ad9f581037f44b72b37f8bee562512854fc6807c5a13ea1646cdeab61c8
        • MD5 SHA1 SHA512 SSDEEP

        memory/3096-134-0x00000000008A0000-0x0000000001AC6000-memory.dmp

        memory/3768-266-0x0000022435FD0000-0x0000022436FD0000-memory.dmp

        memory/3768-253-0x0000022435FD0000-0x0000022436FD0000-memory.dmp

        memory/3768-275-0x0000022435FD0000-0x0000022436FD0000-memory.dmp

        memory/3768-54-0x0000022434760000-0x0000022434761000-memory.dmp

        memory/3768-271-0x0000022435FD0000-0x0000022436FD0000-memory.dmp

        memory/3768-56-0x0000022435FD0000-0x0000022436FD0000-memory.dmp

        memory/3768-277-0x0000022435FD0000-0x0000022436FD0000-memory.dmp

        memory/3768-292-0x0000022435FD0000-0x0000022436FD0000-memory.dmp

        memory/3768-269-0x0000022435FD0000-0x0000022436FD0000-memory.dmp

        memory/3768-267-0x0000022435FD0000-0x0000022436FD0000-memory.dmp

        memory/3768-221-0x0000022435FD0000-0x0000022436FD0000-memory.dmp

        memory/3768-78-0x0000022435FD0000-0x0000022436FD0000-memory.dmp

        memory/3768-85-0x0000022434760000-0x0000022434761000-memory.dmp

        memory/3768-43-0x0000022434760000-0x0000022434761000-memory.dmp

        memory/3768-100-0x0000022435FD0000-0x0000022436FD0000-memory.dmp

        memory/3768-108-0x0000022435FD0000-0x0000022436FD0000-memory.dmp

        memory/3768-259-0x0000022435FD0000-0x0000022436FD0000-memory.dmp

        memory/3768-274-0x0000022435FD0000-0x0000022436FD0000-memory.dmp

        memory/3768-113-0x0000022435FD0000-0x0000022436FD0000-memory.dmp

        memory/3768-120-0x0000022434760000-0x0000022434761000-memory.dmp

        memory/3768-122-0x0000022434760000-0x0000022434761000-memory.dmp

        memory/3768-126-0x0000022434760000-0x0000022434761000-memory.dmp

        memory/3768-132-0x0000022434760000-0x0000022434761000-memory.dmp

        memory/3768-35-0x0000022435FD0000-0x0000022436FD0000-memory.dmp

        memory/3768-171-0x0000022435FD0000-0x0000022436FD0000-memory.dmp

        memory/3768-176-0x0000022434760000-0x0000022434761000-memory.dmp

        memory/3768-181-0x0000022435FD0000-0x0000022436FD0000-memory.dmp

        memory/3768-189-0x0000022435FD0000-0x0000022436FD0000-memory.dmp

        memory/3768-193-0x0000022435FD0000-0x0000022436FD0000-memory.dmp

        memory/3768-196-0x0000022435FD0000-0x0000022436FD0000-memory.dmp

        memory/3768-199-0x0000022435FD0000-0x0000022436FD0000-memory.dmp

        memory/3768-202-0x0000022435FD0000-0x0000022436FD0000-memory.dmp

        memory/3768-206-0x0000022435FD0000-0x0000022436FD0000-memory.dmp

        memory/3920-50-0x0000000073480000-0x0000000073C30000-memory.dmp

        memory/3920-109-0x00000000066E0000-0x000000000672C000-memory.dmp

        memory/3920-106-0x0000000006570000-0x000000000658E000-memory.dmp

        memory/3920-77-0x00000000061A0000-0x00000000064F4000-memory.dmp

        memory/3920-72-0x0000000006090000-0x00000000060F6000-memory.dmp

        memory/3920-75-0x0000000006130000-0x0000000006196000-memory.dmp

        memory/3920-66-0x0000000005EB0000-0x0000000005ED2000-memory.dmp

        memory/3920-48-0x0000000005110000-0x0000000005120000-memory.dmp

        memory/3920-46-0x0000000005110000-0x0000000005120000-memory.dmp

        memory/3920-47-0x0000000005750000-0x0000000005D78000-memory.dmp

        memory/3920-44-0x0000000004FD0000-0x0000000005006000-memory.dmp