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Q: What is the approach for detecting a web shell?

A: The approach for detecting a web shell includes:

  1. Check Filenames: Scan for suspicious or hidden filenames that are commonly associated with web shells.
  2. Analyse File Content: Look for patterns indicating malicious code, such as base64 encoding or system command execution functions.
  3. Check File Permissions: Look for unusual file permissions, such as executable permissions on a web directory.
  4. Monitor File Timestamps: Compare file creation and modification times to detect anomalies.
  5. Check File Size: Look for files that are unusually small or large, especially for .php or .aspx files.