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TrojanDropper:Win32/Updobe.A


TrojanDropper:Win32/Updobe.A is a trojan that installs a malicious plugin in the Firefox browser. The plugin is capable of sending and tracking browser information to a remote Web server. It can hijack search results from the Google search engine to display advertisements served by the malicious server.


What to do now

Manual removal is not recommended for this threat. To detect and remove this threat and other malicious software that may have been installed, run a full-system scan with an up-to-date antivirus product such as the Microsoft Safety Scanner (http://go.microsoft.com/fwlink/?LinkId=212742). For more information, see http://www.microsoft.com/protect/computer/viruses/vista.mspx.

Threat behavior

TrojanDropper:Win32/Updobe.A is a trojan that installs a malicious plugin in the Firefox browser. The plugin is capable of sending and tracking browser information to a remote Web server. It can hijack search results from the Google search engine to display advertisements served by the malicious server.
Payload
Drops other malware
TrojanDropper:Win32/Updobe.A drops the following files in the folder '%AppData%\Adobe\Flash':
 
  • chrome.manifest - clean file
  • install.js - clean file
  • install.rdf - detected as Trojan:XML/Updobe.A
 
It also drops the following files in the folder '%AppData%\Adobe\Flash\content':
 
  • google.js - clean file
  • overlay.xul - clean file
  • overlay.js - detected as Trojan:JS/Updobe.A
  • overlay.js.old - also detected as Trojan:JS/Updobe.A
 
To enable its dropped malware to run every time Firefox is started, it creates the following registry entry:
 
Adds value: "{191d3f14-ff4c-4895-bdea-db54526cb49a}"
With data: "%AppData%\Adobe\Flash"
To subkey: HKCU\Software\Mozilla\Firefox\Extensions
 
Displays advertisements
The malware dropped by TrojanDropper:Win32/Updobe.A hijack search results on Google based on certain keywords. It also monitors the user's browsing behavior and sends information back to 'msjupdate.com'. Advertisements may then be displayed on the system based on the user's search words and browsing behavior.
 
Analysis by Jireh Sanico

Symptoms

System changes
The following system changes may indicate the presence of this malware:
  • The presence of the following files:
    %AppData%\Adobe\Flash\chrome.manifest
    %AppData%\Adobe\Flash\install.js
    %AppData%\Adobe\Flash\install.rdf
    %AppData%\Adobe\Flash\content\google.js
    %AppData%\Adobe\Flash\content\overlay.xul
    %AppData%\Adobe\Flash\content\overlay.js
    %AppData%\Adobe\Flash\content\overlay.js.old
  • The presence of the following registry modifications:
    Added value: "{191d3f14-ff4c-4895-bdea-db54526cb49a}"
    With data: "%AppData%\Adobe\Flash"
    To subkey: HKCU\Software\Mozilla\Firefox\Extensions

Prevention


Alert level: Severe
First detected by definition: 1.65.28.0
Latest detected by definition: 1.173.2181.0 and higher
First detected on: Aug 28, 2009
This entry was first published on: Sep 15, 2009
This entry was updated on: Apr 17, 2011

This threat is also detected as:
  • Win32/VMalum.FYCH (CA)
  • Trojan-Spy.JS.FFSpy.a (Kaspersky)
  • Troj/FFSpy-A (Sophos)
  • Trojan.Spy.FFSpy.A (BitDefender)
  • JS/Spy.FFSpy.A (ESET)
  • FFSpy (McAfee)
  • TSPY_EBOD.A (Trend Micro)