Common Indicators of Attack

Type of Attack Sample Indicators
SQL Injection ' OR '1'='1 (bypasses authentication)
Cross-Site Scripting (XSS) [script]alert('xss')[/script] (injected input reflected on page)
Command Injection ; cat /etc/passwd (appended to input field)
LDAP Injection *)(uid=*))(&(uid=* (bypasses directory filters)
Directory Traversal ../../../etc/passwd (escaping web root)
Buffer Overflow Input of 1000+ consecutive 'A' characters (overflows buffer)
Typosquatting https://paypa1.com/login (numeric '1' replacing letter 'l')
Password Spraying Password123 attempted against thousands of usernames
Pass-the-Hash Authenticating with NTLM hash 31d6cfe0d16ae931b73c59d7e0c089c0
Man-in-the-Middle (MitM) Sudden protocol downgrade from TLS 1.3 to SSL 3.0 in handshake
DDoS (SYN Flood) High volume of TCP SYN packets with spoofed source IPs
Ransomware Mass file renaming to .locked or presence of README_DECRYPT.txt
Logic Bomb IF termination_date > NOW() THEN DELETE * FROM payroll
Fileless Malware (LoTL) PowerShell encoded command: powershell -enc SQBFAFgAIAAoAE4AZQB3AC0ATwBiAGoAZQB...