Symantec Reports of Printer Trojan: Prints until empty

Telemetry data showing the affected areas

Figure 1. Telemetry data showing the affected areas

Over the past two weeks, an outbreak of Trojan.Milicenso has resulted in multiple reports of massive print jobs being sent to print servers, printing garbage characters until the printer runs out of paper. Our telemetry data has shown the worst hit regions were the US and India followed by regions in Europe and South America. We originally encountered Trojan.Milicenso in 2010 and our initial investigation had shown that this was basically a malware delivery vehicle for hire. The payload that is most commonly associated with this latest version is Adware.Eorezo; an adware targeting French speaking users.

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