Summary
When installed on a mobile phone, this trojan monitors all incoming SMS messages and acts as a backdoor for receiving commands sent by an attacker via SMS messages.
Removal
Trojan:SymbOS/ZeusMitmo can be manually uninstalled by removing the following program via the phone's Application Manager:
Nokia Update
A False Positive is when a file is incorrectly detected as harmful, usually because its code or behavior resembles known harmful programs. A False Positive will usually be fixed in a subsequent database update without any action needed on your part. If you wish, you may also:
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Technical Details
Trojan:SymbOS/ZeusMitmo.A 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.
Distribution
ZeusMitmo.A is distributed by Trojan-Spy:W32/Zbot.PUA or Trojan-Spy:W32/Zbot.PUB.
Trojan-Spy:W32/Zbot.PUA sends an SMS message to the user's phone containing a link to a website hosting the malicious ZeusMitmo trojan. If the link is followed, the trojan is promptly downloaded and installed on the phone.
In our analysis, the malicious trojan was a Symbian-signed file for S60 3rd Edition and 5th Edition mobile phones. The file itself is named cert.sis, and may be deceptively billed as a 'Nokia Update'. .jad files, used for Blackberry devices, have also been reported.
Installation
During installation, the trojan registers itself to start when the phone is booted up. Once active, the trojan is able to silently monitor all incoming SMS messages.
Activity
If an SMS is sent to the user's mobile device with the target bank's authentication code, the malicious software running in the device forwards the SMS to another terminal controlled by the attacker.
The trojan contains a hard-coded phone number for use in sending the stolen SMS messages and receiving commands from the attacker(s).
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