Virus Name: Positron
V Status: New
Discovered: September, 1994
Symptoms: .COM file growth;
decrease in total system & available free memory
Eff Length: 512 Bytes
Type Code: PRhC - Parasitic Resident .COM Infector
Detection Method: ViruScan, IBMAV, F-Prot, NAV, NAVDX, AVTK 7.68+,
NShld, IBMAV/N, NAV/N, AVTK/N 7.68+
Removal Instructions: Delete infected files
The Positron virus was received in September, 1994. Its origin or
point of isolation is unknown. Positron is a memory resident
infector of .COM files, but not COMMAND.COM.
When the first Positron infected program is executed, this virus will
install itself memory resident at the top of system memory but below
the 640K DOS boundary, not moving interrupt 12's return. Total system
and available free memory, as indicated by the DOS CHKDSK program,
will have decreased by 560 bytes. Interrupt 21 will be hooked by the
virus in memory.
Once the Positron virus is memory resident, it will infect .COM
programs when they are executed. Infected programs will have a file
length increase of 512 bytes with the virus being located at the end
of the file. The program's date and time in the DOS disk directory
listing will not be altered. The following text strings are visible
within the viral code in all Positron infected programs:
"(c) 1994 Evil Avatar"
The Positron virus doesn't do anything besides replicate.