If the attack is successful, one of two malicious software programs is delivered, called Citadel or ZeroAccess. Citadel is a trojan designed to collect account credentials for banks including Bank of America, Wells Fargo, Chase and others, according to Fox-IT, a Dutch computer forensics company.
The version of Citadel analyzed by Fox-IT showed it was being detected by only three of 46 products on VirusTotal, a website where malicious software can be tested for detection against many of the popular security suites.
According to Symantec, ZeroAccess is an advanced rootkit, or a piece of malicious software that hides at a low level in a computer's operating system. ZeroAccess, detected by Symantec in July 2011, can create its own hidden file system and download other malware to a computer.