Symantec's early-warning system gave its enterprise customers a brief scare last Friday (21 September) when it erroneously sent an alert that said an Internet-crippling attack was in progress.
The message, which went out to users of Symantec's DeepSight advanced alert system around 8:40 pm US Eastern time, had a subject head that simply read: "DeepSight Increased ThreatCon from 1 to 4 Alert."
ThreatCon uses a 1-4 scoring system, with 1 being the least alarming threat level and 4 the most dire, to indicate Symantec's take on the current state of Internet security.
According to the company's own definition, Level 4 is regarded as a "Full alert" and is reserved for those times when "extreme global network incident activity is in progress." The definition goes on to say that "implementation of measures in this Threat Condition for more than a short period probably will create hardship and affect the normal operations of network infrastructure."
Symantec has never set ThreatCon to Level 4. In fact, even a Level 3 is rare. One of the last times the security company issued a Level 3 alert was in May 2004, when the Sasser worm was on the rampage.
In the body of the e-mailed alert, however, careful readers found the words "Summary: threatcon test threatkhanh otrs" buried among several links.
The alert was a false alarm, and Symantec sent out a correction just over an hour later.