Analysis

  • max time kernel
    1799s
  • max time network
    1801s
  • 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-qvlrtabe9s
  • 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

Extracted

Language
  • ps1

Deobfuscated
Source
URLs
  • ps1.dropper

    https://files.catbox.moe/fvl5hy.jpg

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 59 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.

  • Enumerates physical storage devices 1 TTPs

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

  • Modifies registry class 1 IoCs
  • Suspicious behavior: EnumeratesProcesses 2 IoCs
  • Suspicious use of AdjustPrivilegeToken 1 IoCs
  • Suspicious use of SetWindowsHookEx 1 IoCs
  • Suspicious use of WriteProcessMemory 25 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:4548
    • 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:760
      • 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:4540
    • 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:3656
      • 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
        PID:5016
    • 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:4552
      • C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
        "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -executionpolicy remotesigned -File "C:\ProgramData\rrrrrrrr.ps1"
        3⤵
        • Blocklisted process makes network request
        • Suspicious behavior: EnumeratesProcesses
        • Suspicious use of AdjustPrivilegeToken
        PID:3464
    • 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⤵
      • Suspicious use of WriteProcessMemory
      PID:1044
      • 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:3924
    • 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:1928

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 13a1852cd63bc00ce9196a9de8ae286cdd7fc5d15e401f3b3804fbdd0de9c953
        • MD5 SHA1 SHA512

        rrrrrrrr.ps1

        • Path C:\ProgramData\rrrrrrrr.ps1
        • Size 437B
        • SHA256 4247e7a94a7fd5e4266622a37d91770dfedb12587aff4c2ece7812c56bd2c1fb
        • 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_qqdjrihd.pdn.ps1

        • Path C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_qqdjrihd.pdn.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/1044-205-0x000001A380000000-0x000001A381000000-memory.dmp

        memory/1044-208-0x000001A380000000-0x000001A381000000-memory.dmp

        memory/1044-275-0x000001A380000000-0x000001A381000000-memory.dmp

        memory/1044-273-0x000001A380000000-0x000001A381000000-memory.dmp

        memory/1044-59-0x000001A380000000-0x000001A381000000-memory.dmp

        memory/1044-68-0x000001A380000000-0x000001A381000000-memory.dmp

        memory/1044-271-0x000001A380000000-0x000001A381000000-memory.dmp

        memory/1044-77-0x000001A3FDA00000-0x000001A3FDA01000-memory.dmp

        memory/1044-269-0x000001A380000000-0x000001A381000000-memory.dmp

        memory/1044-94-0x000001A380000000-0x000001A381000000-memory.dmp

        memory/1044-267-0x000001A380000000-0x000001A381000000-memory.dmp

        memory/1044-263-0x000001A380000000-0x000001A381000000-memory.dmp

        memory/1044-256-0x000001A380000000-0x000001A381000000-memory.dmp

        memory/1044-252-0x000001A380000000-0x000001A381000000-memory.dmp

        memory/1044-101-0x000001A380000000-0x000001A381000000-memory.dmp

        memory/1044-108-0x000001A380000000-0x000001A381000000-memory.dmp

        memory/1044-113-0x000001A3FDA00000-0x000001A3FDA01000-memory.dmp

        memory/1044-116-0x000001A3FDA00000-0x000001A3FDA01000-memory.dmp

        memory/1044-117-0x000001A3FDA00000-0x000001A3FDA01000-memory.dmp

        memory/1044-236-0x000001A380000000-0x000001A381000000-memory.dmp

        memory/1044-228-0x000001A380000000-0x000001A381000000-memory.dmp

        memory/1044-227-0x000001A380000000-0x000001A381000000-memory.dmp

        memory/1044-43-0x000001A3FDA00000-0x000001A3FDA01000-memory.dmp

        memory/1044-152-0x000001A3FDA00000-0x000001A3FDA01000-memory.dmp

        memory/1044-151-0x000001A380000000-0x000001A381000000-memory.dmp

        memory/1044-157-0x000001A380000000-0x000001A381000000-memory.dmp

        memory/1044-224-0x000001A380000000-0x000001A381000000-memory.dmp

        memory/1044-36-0x000001A380000000-0x000001A381000000-memory.dmp

        memory/1044-202-0x000001A380000000-0x000001A381000000-memory.dmp

        memory/1044-198-0x000001A380000000-0x000001A381000000-memory.dmp

        memory/1044-195-0x000001A380000000-0x000001A381000000-memory.dmp

        memory/3464-92-0x0000000006B10000-0x0000000006B76000-memory.dmp

        memory/3464-97-0x0000000006B80000-0x0000000006ED4000-memory.dmp

        memory/3464-166-0x0000000005C10000-0x0000000005C2A000-memory.dmp

        memory/3464-48-0x0000000004D80000-0x0000000004D90000-memory.dmp

        memory/3464-219-0x0000000073B80000-0x0000000074330000-memory.dmp

        memory/3464-164-0x00000000087D0000-0x0000000008E4A000-memory.dmp

        memory/3464-128-0x0000000007060000-0x00000000070AC000-memory.dmp

        memory/3464-125-0x0000000007040000-0x000000000705E000-memory.dmp

        memory/3464-179-0x0000000073B80000-0x0000000074330000-memory.dmp

        memory/3464-46-0x0000000073B80000-0x0000000074330000-memory.dmp

        memory/3464-53-0x0000000004D80000-0x0000000004D90000-memory.dmp

        memory/3464-47-0x0000000004DD0000-0x0000000004E06000-memory.dmp

        memory/3464-186-0x0000000004D80000-0x0000000004D90000-memory.dmp

        memory/3464-89-0x0000000006930000-0x0000000006996000-memory.dmp

        memory/3464-75-0x0000000005BE0000-0x0000000005C02000-memory.dmp

        memory/3464-49-0x0000000005440000-0x0000000005A68000-memory.dmp

        memory/5016-123-0x0000000000F70000-0x0000000002196000-memory.dmp