home *** CD-ROM | disk | FTP | other *** search
-
- ┌───────────────────────────────┐
- │ THE VIRUS INFORMER │ FACT: Each day of the year a
- │ your weekly virus newsletter │ new virus is introduced into
- │ by Mark E. Bishop edited by │ the computer industry.
- │ Alan Bechtold │
- └───────────────────────────────┘
-
-
-
- CHAPTER 4: 'The Engine that Kills! A Mutating Menance!'
- Dark Avenger Mutation Engine No Threat to Protected PCs
-
-
- Santa Clara, CA -- May 11,1992 -- McAfee Associates confirmed today that
- users of its suite of VIRUSCAN anti-virus products have nothing to fear from
- the new generation of mutating or polymorphic viruses.
-
- McAfee Associates, the nation's leading anti-virus software company, has
- been swamped with calls from concerned corporate PC users worried about the
- threat of the so-called Dark Avenger Mutation Engine.
-
- "Actually, we cracked this engine some months ago and have been shipping
- product capable of detecting the Mutation Engine since March," said William
- S. McKiernan, vice president, McAfee Associates.
-
- The Dark Avenger Mutation Engine, which first appeared on European bulletin
- boards a few months ago, is a new kind of virus threat. In the past, viruses
- such as the Jerusalem or the recent Michelangelo strain had distinct, single
- identities that made them relatively easy to detect and control.
-
- "The Mutation Engine, however, can be used by virtually anyone to create a
- mutating virus which is very difficult to detect," said McKiernan. "The fact
- that it is widely available on bulletin boards makes it that much more
- frightening."
-
- The Mutation Engine uses encryption techniques to avoid detection. Before
- a virus can become active it needs to decrypt itself. Ordinarily the code
- used for this decryption remains constant, allowing the use of standard byte
- matching techniques for detection.
-
- The Mutation Engine, however, uses a special algorithm to generate a
- completely variable decryption routine each time. "The result is that no
- three bytes remain constant from one sample to the next," said Igor Grebert,
- senior programmer at McAfee Associates. "This makes detection using
- conventional string matching techniques impossible."
-
- VIRUSCAN, however, has no such problem. According to McKiernan, the
- downloadable shareware contains a new generation of virus detection algorithm
- capable of statistical and numerical analysis.
-
- It detects the Mutation Engine by "sensing" its presence rather than by
- attempting to actually spot it in a byte-for-byte string comparison.
- VIRUSCAN consistently detected all iterations of the Mutation Engine in tests
- done at McAfee, McKiernan said.
-
- Santa Clara-based McAfee Associates first received reports of the Mutation
- Engine early this year. It is believed that the Engine is a product of the
- Bulgarian virus creator responsible for the original conventional Dark
- Avenger virus.
-
- Though some viruses using the Mutation Engine have already appeared in the
- U.S., the engine is not expected to present a widespread problem for some
- time, McKiernan said. Typically the McAfee "early warning" network
- identifies new viruses months before they are a threat to the U.S. market.
-
- Nevertheless, the PC world has reacted emotionally to the presence of the
- Mutation Engine. "It is clear that the game is forever changed," said
- columnist Steve Gibson in a recent issue of the computer journal InfoWorld.
- "The sophistication of the Mutation Engine is amazing and staggering."
-
- The presence of the Mutation Engine on bulletin boards may be more of a
- threat than the virus itself. "You no longer have to be particularly clever
- or experienced to use it," said McKiernan. "Now if you have a modem you can
- be in the virus business overnight and the potential for proliferation is a
- sobering thought."
-
- McKiernan said that conventional viruses are turning up at a rate of 10 to
- 20 per week. "We expect that the Mutation Engine will increase this problem
- exponentially for those with unprotected systems," he said.
-
-
- - end -
-