Virus Profile: JV/Downloader-CVB

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Virus Profile information details
Risk Assessment: Home Low | Corporate Low
Date Discovered: 10/3/2012
Date Added: 10/3/2012
Origin: Unknown
Length: Varies
Type: Trojan
Subtype: Downloader
DAT Required: 6822
Removal Instructions


This is a Trojan detection. Unlike viruses, Trojans do not self-replicate. They are spread manually, often under the premise that they are beneficial or wanted. The most common installation methods involve system or security exploitation, and unsuspecting users manually executing unknown programs. Distribution channels include e-mail, malicious or hacked Web pages, Internet Relay Chat (IRC), peer-to-peer networks, etc.

Indication of Infection

Typically this exploit is used to execute other programs. Those programs can be whatever the author chooses to run on the vulnerable system. Therefore it is not possible to provide specific information as one attack can vary from the next. This detection covers the underlying exploit code, rather than any one specific attack incident.

Methods of Infection

Trojans do not self-replicate. They are spread manually, often under the premise that the executable is something beneficial. Distribution channels include IRC, peer-to-peer networks, newsgroup postings, email spam, etc.

Virus Characteristics

JV/Downloader-CVB” is the detection for malicious Java applet that downloads and executes arbitrary files.
Jar file is executed as applet in a crafted web page and url in encoded form will be passed as a parameter (site) to this applet.

Download the payload into %temp% directory with random name.

Below is the Java code which confirms that it get the URL as the parameter from the html


All Users:
Use current engine and DAT files for detection and removal.

Modifications made to the system Registry and/or INI files for the purposes of hooking system startup, will be successfully removed if cleaning with the recommended engine and DAT combination (or higher).


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