A new variant of the Dorkbot malware was discovered spreading through Facebook's internal chat service, in an attempt by cyber criminals to harvest users' passwords. Bitdefender researchers discovered links to the malware circulating among Facebook users in the United States, India, Portugal, the United Kingdom, Germany, Turkey and Romania. The security firm did not know the extent of the infection on Monday, but said it counted 9,000 malicious links to the malware in 24 hours.