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[ISSForum] ISS Security Brief: "Stumbler" Distributed Stealth Scanning Network


Internet Security Systems Security Alert
June 19, 2003

"Stumbler" Distributed Stealth Scanning Network


X-Force has been tracking reports of suspicious and widespread Internet
traffic with a TCP Window size of 55808. A substantial amount of traffic
captured from sites around the world point to a new distributed port
scanning system. X-Force has analyzed malware that appears to be a client
capable of scanning and receiving network mapping data from other similar
clients distributed across the Internet. X-Force has named this malware,

For the complete ISS X-Force Security Alert, please visit: 


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Founded in 1994, Internet Security Systems (ISS) (Nasdaq: ISSX) is a 
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online resources from an ever-changing spectrum of threats and misuse. 
Internet Security Systems is headquartered in Atlanta, GA, with 
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