Viruses that are detected by AVP engine as 'Virus.Sim' are
so-called 'safe' viruses. They are generated by the Rosenthal
Virus Simulator. Here's how the author of this Virus Simulator
describes these viruses:
"These Virus Simulator programs generate safe and sterile,
controlled test suites of sample virus programs. Virus
Simulator's ability to harmlessly compile and infect with safe
viruses, is valuable for demonstrating and evaluating anti-virus
security measures without harm or contamination of the system.
The infected programs can be used as bait for virus detecting
programs to gain practical virus protection experience."
These viruses do not possess any threat as they don't replicate.
They can be only used for anti-virus products testing.