This virus was first discovered in April 1990.
Unlike other generic file infectors, AIDS II was the second known virus to employ what could be called a "corresponding file technique" of infection so that the original target EXE file is never changed.
When the user runs a program which the virus has been dropping a viral DOS executable file having the same name, the virus is executed, followed by the host program.
These drop programs always have the size of 8,064 bytes with their timestamps at the time of infection.
After creating the companion file, the virus then plays a melody and displays the following message:
Your computer is infected with ... ♥ Aids Virus II ♥ - Signed WOP & PGT of DutchCrack -
After completion of the program, control returns to the virus. The melody is played again with the following message displayed
Getting used to me? Next time, use a Condom .....
Since the original EXE file remains unaltered, CRC programs cannot detect this virus having infected a system. One way to manually remove AIDS II is to check the disk for programs which have both a DOS and EXE formats, with the COM file having a length of 8,064 bytes, then it would probably the virus. The COM files thus identified should be erased.
According to Symantec, AIDS II may play a melody and display the following message:
Your computer is infected with AIDS VIRUS II
While this text string does not appear in the viral code.