For more information of Word macro viruses, see the description of Concept.
WM/Imposter.A is a common Word macro virus, which is similar to DMV and Concept viruses.
Once detected, the F-Secure security product will automatically disinfect the suspect file by either deleting it or renaming it.
When it first infects a system, it displays a dialog box with text 'DMV'.
Imposter.A contains a comment which reads:
just to prove another point
Imposter.A only replicates.
Unlike Imposter.A, this variant is not very similar to DMV or Concept viruses.
When the virus infects the system for a first time and the user exits Word, it displays the following message in the status bar:
WORMY-1 by NAENBGOURSG
After that Imposter.E infects every document when they are saved. It also re-infects files that have been infected already.
Virus also contains this text within its code:
by NAENBGOURSG SO.HT.AI.KS 231076-GREECE Thanks to NEURO VRD 19-4-1997 VRP A.U.A
Otherwise the virus just spreads.
Technical Details: Mikko Hypponen and Katrin Tocheva, F-Secure Ltd