I was surprised to find that many of the definitions on this list are for very old pieces of code. During this one-week period in April , Symantec updated its definitions for the following pieces of ancient malware and bumped up the counter in its definition files accordingly:.
In addition, these April definition files include multiple revised detections for Waledac and Rustock, the Trojans responsible for two prolific spam botnets that were decisively shut down in February and March , respectively.
For each named entry, Symantec includes the date when that entry was first added to its definitions list. Only 31 entries were discovered in or And one-third of those were from non-Windows platforms. Flashback, from last fall, and the newer OSX. K, which wreaked havoc on Mac owners over the past month. On its Latest Threats and Risks list , Symantec includes writeups for more than 80 Android-related programs, most classified as Trojans or Spyware.
To make sure those numbers were representative, I looked at the Symantec definitions database for the entire month of March. In all, 66 new named entries were added to the list, or about two per day. Of that total, 36 represented new, named Trojans, viruses, and worms. Traditionally, many of these steps have been performed by different groups of researchers, with some focusing their efforts on sampling viruses in the wild, and others sticking mostly to characterizing pathogens in the lab, Tovar says.
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You also have the option to opt-out of these cookies. In , estimates ranged from to ; then in estimates ranged from to 1, different viruses. In late , estimates were ranging from 1, to 2, viruses. In mid, the numbers vary from 4, to over 7, viruses. In the number climbed over 10, Is this a new virus? Most experts say yes.
Another problem comes from viruses that try to conceal themselves from scanners by mutating. In other words, every time the virus infects another file, it will try to use a different version of itself. These viruses are known as polymorphic viruses. One example, the Whale an early, huge, clumsy 10, byte virus , creates 33 different versions of itself when it infects files.
At least one vendor counted this as 33 different viruses on their list. David M. To keep track visit the Wildlist , a list which reports virus sightings.
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