New Skype Trojan – Peskyspy (August 31, 2009)

SonicWALL UTM Research team observed a new Skype Trojan that records Skype audio conversations on the victim machine, stores it in encrypted MP3 format, and relays it back to the hacker.

The Peskyspy Trojan injects a DLL file into Skype process on the victim machine. The DLL contains function calls to intercept all audio data input and output by the Skype process. This is done before Skype encrypts the data it sends over the network.

The Trojan extracts the PCM audio data and saves it locally as encrypted MP3 files. It sends these encrypted audio files back to the Attacker’s data server.

Screenshot of the Peskyspy Trojan in action is shown below –

This Trojan is also known as Troj/Skytap-Gen [Sophos], Trojan.Skytap.A [BitDefender], and W32/Skytap.A [F-Prot].

SonicWALL Gateway AntiVirus provides protection against this malware via GAV: Peskyspy (Trojan) and GAV: Peskyspy_2 (Trojan) signatures.

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The SonicWall Capture Labs Threat Research Team gathers, analyzes and vets cross-vector threat information from the SonicWall Capture Threat network, consisting of global devices and resources, including more than 1 million security sensors in nearly 200 countries and territories. The research team identifies, analyzes, and mitigates critical vulnerabilities and malware daily through in-depth research, which drives protection for all SonicWall customers. In addition to safeguarding networks globally, the research team supports the larger threat intelligence community by releasing weekly deep technical analyses of the most critical threats to small businesses, providing critical knowledge that defenders need to protect their networks.