The AntiSec movement has claimed a number of hits on sites running Panda Security content, defacing them with a message for Sabu, who was outed as an alleged FBI informant yesterday.
The message said "Sabu snitched on us," adding "we can't imagine how it feels having to look in the mirror each morning and see there the guy who shopped their friends to the police."
AntiSec also had some comments for Panda Security, claiming the company helped jail 25 Anonymous members and was trying to snare others by using the hacktivist group's IRC channels.
The attack did not breach Panda Security's internal network and neither source code, update servers nor customer data was accessed.
"Yep, we know about you. How does it feel being the spied one," the message read.
Panda confirmed a number of its sites were hit, but not the official pandasecurity.com or cloudantivirus.com domains. The defacements came as a result of a webserver hosted outside of the Panda Security internal network being compromised.
"This server was only used for marketing campaigns and to host some of the company's blogs," a company spokesperson said.
"The attack did not breach Panda Security's internal network and neither source code, update servers nor customer data was accessed. The only information accessed was related to marketing campaigns such as landing pages and some obsolete credentials, including supposed credentials for employees that have not been working at Panda for over five years.
"We continue investigating the cause of the intrusion and will provide more details as soon as they become available."
Panda said concerned customers could contact the firm via communication@pandasecurity.com.
Yesterday saw the FBI charge five men in relation to an investigation into different hacktivist groups.
Two of the men charged were from the UK - Ryan Ackroyd and Jake Davis. Akroyd and Davis were interviewed by London's Met police last year in relation to LulzSec attacks, it is believed.
The FBI also revealed Monsegur pleaded guilty on 15 August 2011 in US District Court to 12 counts of various computer hacking conspiracies and other crimes.
Monsegur, who Fox News claimed yesterday had been recruited by the FBI as an informant after he was arrested, faces a maximum sentence of 124 years and six months in prison.
