A bot is an automated software program designed to perform specific tasks over the internet, often at speeds and volumes impossible for human users. Bots can be beneficial, such as search engine crawlers that index web content, or malicious, such as credential stuffing bots that test stolen passwords against login pages at scale.
How It Works
Legitimate bots operate openly, identifying themselves through user-agent strings and respecting directives in robots.txt files. They perform useful functions like indexing content, monitoring website uptime, or aggregating price information. These bots typically operate within defined rate limits and follow established protocols.
Malicious bots are designed to evade detection while accomplishing harmful objectives. They rotate IP addresses, mimic human browsing patterns, solve CAPTCHAs, and randomize request timing to avoid triggering rate limits or bot detection systems. Common malicious bot activities include credential stuffing (testing stolen credentials against login forms), web scraping (extracting proprietary content), inventory hoarding (buying limited-stock items for resale), and distributed denial-of-service attacks (overwhelming servers with traffic).
Botnets take the concept further by combining thousands or millions of compromised devices, often personal computers or IoT devices infected with malware, into a coordinated network controlled by an attacker. Each individual bot in the network contributes a small amount of traffic, making the attack appear distributed and making individual bot identification difficult. The controller communicates with the botnet through command-and-control infrastructure, directing the bots to launch attacks, send spam, or mine cryptocurrency.
Why It Matters
Bot traffic represents a significant portion of internet activity, and distinguishing between legitimate bots, malicious bots, and real users is a persistent challenge. Security assessments evaluate how applications handle automated traffic, testing whether rate limiting, CAPTCHA implementations, and bot detection mechanisms effectively prevent automated abuse while remaining usable for legitimate visitors.
Need your application tested? Get in touch.