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Clickbot.A is a botnet associated with online advertising click fraud. Discovered in May 2006, it infected victim systems and used them to automatically click pay-per-click advertisements at scale, enabling fraudulent ad revenue generation and invalid traffic. Early reporting indicated rapid growth from roughly 100 infected machines to more than 100,000 within about a month, illustrating its effectiveness as a distributed fraud platform.
The malware was implemented as an Internet Explorer plugin and was downloaded by Internet Explorer users, indicating a Windows-centric infection footprint tied to that browser environment. In addition to automated ad-clicking, Clickbot.A was reported to steal user passwords, showing that it combined ad-fraud monetization with credential theft. Its use of many compromised hosts provided the distributed infrastructure typical of botnets, helping operators generate fraudulent activity from diverse victim machines.
Clickbot.A is primarily notable as an early large-scale click-fraud botnet and as a case study in ad-fraud operations that leveraged compromised endpoints rather than simple centralized scripts. It is relevant to defenders monitoring financially motivated malware, browser-based compromise, and botnet-enabled abuse of advertising ecosystems.
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Botnet used primarily for click fraud (automated pay-per-click ad clicking) and also for stealing user passwords; implemented as an Internet Explorer plugin downloaded by IE users.
Mentioned only in a 'See also' list related to click fraud; no substantive discussion in the content.
Named trojan referenced as discovered in 2006; no additional technical behavior described in the content.
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