Criminals Host Trojans on Cloud Storage Service Rapidshare

Spammers are using cloud-based storage services to store malware, allowing them to circumvent e-mail spam filters, according to security experts at Kaspersky Lab and MX Lab.

Kaspersky Lab detected the click-fraud Trojan, a variant of the Trojan-Dropper.Wind32.Drooptroop family, which has been in circulation since the beginning of December, said Vicente Diaz, a Kaspersky Lab expert. There are over 7,000 variants of this particular family, according to Kaspersky. As with other types of malware that took advantage of the holiday season, the executable file for this Trojan was named gift.exe, Diaz said.

The security firm detected more than 1,000 infections using this technique to distribute this variant, according to Diaz.