Security Experts:

Customizable "Remvio" Trojan Available for Just $58

An Italian malware author going by the name "z3r0" is currently offering a remote access Trojan for as low as $58, according to researchers at Symantec.

Dubbed Remvio, the backdoor Trojan comes with an end user license agreement (EULA) that denies responsibility if the buyer uses it for malicious activity. Depending on the type of license agreement the buyer wants, the malware’s price could go to as high as $389.

Remvio was designed to target all versions of Windows and can be used against both corporations and private users, Symantec’s Christian Tripputi explains. However, the security researcher also notes that it is still unclear whether the backdoor Trojan is already being used in live attacks or not.

After purchase, the malware can be distributed through various methods, including watering hole attacks, spam emails that contain a link to the Trojan, or malicious attachments. Overall, the possibilities are endless for cybercriminals, as the malicious software can also be distributed via exploit kits and droppers.

According to Symantec, the Trojan was built in C++ and has a small size of only 24-70 KB, but still includes a great deal of capabilities. The security researchers also discovered that the Trojan’s builder and control panel is approximately 6.3MB and that it was developed using the Delphi programming language.

“The control panel includes functionalities like automation tasks, which facilitate exfiltration activities without requiring the cybercriminal to physically operate the threat when the victims come online,” Tripputi notes.

What’s more alarming, however, is that the malware can act as a remote access Trojan (RAT), being designed to log keystrokes, capture screenshots, record webcam audio and video, and record microphone audio. At the same time, the malware can extract passwords from a broad range of applications, researchers say.

According to Symantec, although Remvio’s control panel claims it can steal credentials from Safari, no evidence that the builder supports the creation of Mac OS X malware has been found. Even so, the Trojan was confirmed to support the gathering of passwords from popular browsers and instant messaging applications such as Internet Explorer, Chrome, Firefox, Opera, Pidgin, Trillian, Miranda, ICQ, Digsby, PaltalkScene, and Windows MSN/Live Messenger.

Additionally, Symantec found that Remvio can be fully configured to evade most security technologies and that it packs anti-analysis options as well. Should the Trojan detect that it is running inside a virtual machine or a debugger, it would terminate and then delete itself, Tripputi explains.

By default, the malware uses port 2404 for network communication, but the builder interface allows the Trojan’s operators to change that. Researchers also discovered that “pass” is used as the default encryption network password, but say that this can be changed. The registry hive name, where the backdoor is dropped, and how it starts on the compromised computer are also customizable.

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