Stealth virus is stealthiest of all - "This piece of code is so sloppy, it's devious"

[The Helper]

There's a new mass mailing virus in town, and it's built to make life for AV researchers even more difficult.

Atak uses a variety of tactics in its attempts to escape antivirus analysis. Its main trick is to check to see if it's being run in a debugging environment. If so, it exits to avoid detection. The ploy prevents casual perusal of the code by researchers and (potentially) rival virus writers.

Read the entire article here.