That string looks like a SQL-injection payload. Quick breakdown:
- It’s trying to break out of a quoted value (the single quote) and inject an OR condition.
- 2+175-175-1 evaluates to 1, and 0+0+0+1 evaluates to 1, so the expression 2+175-175-1 = 0+0+0+1 is true.
- The attacker’s goal is to turn the WHERE clause into a true condition (or otherwise confuse parsing) so the query returns data or bypasses authentication.
I can’t help craft or extend injection attacks, but I can help you defend against them. Recommended mitigations (high level):
- Use parameterized queries / prepared statements everywhere instead of concatenating SQL strings.
- Use stored procedures or ORM query builders that parameterize inputs by default.
- Validate and whitelist input types/lengths (reject or normalize unexpected input).
- Apply least-privilege to database accounts used by the app (prevent excessive read/write).
- Escape user input only when necessary and with the correct escaping for the SQL dialect (avoid relying on manual escaping).
- Use error-handling that doesn’t leak SQL errors to users, and enable logging/monitoring of suspicious inputs.
- Deploy a Web Application Firewall (WAF) and run regular security scans / penetration tests.
If you want, tell me the language/framework you’re using and I can show a secure example of how to parameterize queries (no attack examples). Or if you found this string in logs and want help assessing impact, tell me more about the context.