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Welchia: Just trying to help
Welchia is what they call a "helpful" worm. Instead of attacking, it attempts to download and install missing Windows security patches. What a great idea! What could possibly go wrong? go wrong? go wrong?
Because of the way the worm spread and the way it did its updates, it caused traffic storms on company networks as systems all pulled updates and communicated at the same time. Removal was a manual business, costing IT departments lots of time.
Welchia contains and displays many messages, including the ones displayed here, alluding to Japanese involvement in World War II.
Apache blows chunks
Apache Chunked-Encoding Memory Corruption Vulnerability is another in a group of remote code execution vulnerabilities in the Apache server in the early part of the last decade. This one could be exploited merely by sending a carefully crafted invalid request, and the vulnerable code was turned on by default.
This one was exploited in the wild leading to a particularly messy cleanup.