General

  • Target
    SteamWebHelper.exe
  • Size 12.5MB
  • Sample261019-bykllaxybw
  • SHA256 fe4698faf6bcd3d5885563c79348c5bbc807f9037ac6b4d9afdae3b8f65a71a3
  • MD5 SHA1 SHA512 SSDEEP TLSH

Malware Config

Targets

    • Target
      SteamWebHelper.exe
    • Size 12.5MB
    • SHA256 fe4698faf6bcd3d5885563c79348c5bbc807f9037ac6b4d9afdae3b8f65a71a3
    • MD5 SHA1 SHA512 SSDEEP TLSH
    • Command and Scripting Interpreter: PowerShell

      Run Powershell and hide display window.

    • Creates a file in the Startup directory

      A file was written to a Windows startup folder. Files in these directories are executed automatically when a user logs on or an application initializes.

    • Executes dropped EXE

    • Outbound SSH connection to public host

      SSH is used for remote access. This may indicate SSH host discovery, encrypted C2 traffic, or data exfiltration.

    • Adds Run key to start application

    • Contacts third-party web service commonly abused for C2

      Legitimate web (hosting) services can be abused by malware authors to host malware or C2s.

    • Discovers running processes

      Running process information can be used to identify security tools or plan follow-on actions.

    • Executes a VBScript file via the Windows Script Host.

MITRE ATT&CK Enterprise v16

Tasks