Threat Description

Trojan-Spy: W32/Zbot.PUA

Details

Category: Malware
Type: Trojan-Spy
Platform: W32
Aliases: Trojan-Spy:W32/Zbot.PUB, Rootkit.39841, Trojan-Spy.Win32.Zbot.aovj

Summary


This type of trojan secretly installs spy programs and/or keylogger programs.



Removal


Automatic action

Once detected, the F-Secure security product will automatically disinfect the suspect file by either deleting it or renaming it.

More scanning & removal options

More information on scanning or removal options is available in the documentation for your F-Secure security product on the Downloads section of our Home - Global site.

You may also refer to the Knowledge Base on the F-Secure Community site for more information.

Contact Support

For further assistance, F-Secure customers can request support online via the Request support or the Chat forms on our Home - Global site.



Technical Details


Trojan-Spy:W32/Zbot.PUA is notable for being specifically designed to steal SMS messages containingm obile transaction authentication number (mTANs), which are like single-use passwords sent by banks to to their account holders' mobile phones to verify online transactions.

By stealing this information, attackers raiding a online bank account are able to perform transactions they would otherwise be unable to complete without offline authorization.

The trojan-spy first uses standard social engineering tactics (either phishing or pharming) to deceive a user into giving out the username and password for their online bank accounts. The added twist for this this trojan-spy is that it also asks for the user's mobile phone details.

Based on the provided information, the trojan-spy then sends an SMS message to the user's phone, containing a link to a malicious mobile component, which we detect as Trojan:SymbOS/ZeusMitmo.A. This trojan is responsible for monitoring and stealing the SMS messages containing mTANs.

In our analysis, the mobile malware installed is a Symbian-signed file for S60 3rd Edition mobile phones. The file is named cert.sis; it may also be deceptively billed as a "Nokia Update". The mobile component has also been reported to be available in .jad files for Blackberry devices.

This trojan-spy is also discussed in the following Labs Weblog post:





Description Created: 2010-09-28 04:34:23.0

Description Last Modified: 2010-09-28 05:22:15.0


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