I was just researching Anti-Trojan 5.5 & I found this thread over at www.wilderssecurity.com.

Apparently it’s no better than any other AV for catching trojans. Here’s a quote from wizard, one of the mods.

Okay I made a quick investigation of AT-Watch with FileMon from Sysinternals. AT-Watch does not scan process memory. It just scans the files saved on disc and not in memory.

Therefore I consider AT to be useless like most antivirus software against backdoor trojans because it has no unpacking engine and no memory scan. So how does it protect against packed/crypted trojans which are more than common these days?

AT is IMHO just an old fashioned anti trojan program where runtime packer were not used at all and the files remain “static”