Internet threat level: 1
Home→Descriptions→Trojan-Downloader.Java.OpenConnection.dd
Trojan-Downloader.Java.OpenConnection.dd
| Detected | Feb 07 2011 12:18 GMT |
| Released | Feb 07 2011 19:54 GMT |
| Published | Mar 25 2011 10:46 GMT |
Payload
Removal instructions
Technical Details
This Trojan downloads files from the Internet and launches them without the user's knowledge. It is a Java class file. It is 4588 bytes in size.
Payload
The malware is a component of a Trojan downloader from the "Trojan-Downloader.Java.OpenConnection" family and includes a class file named "bear", which downloads a file from the Internet, from a link sent to it, and launches the downloaded file for execution. The downloaded file is saved in the current user's temporary files directory as
%Temp%\<rnd>.exewhere
The Trojan constitutes a Java applet. It is launched from an infected HTML page using an "<APPLET>" tag, for which an encrypted link to a downloadable file is sent in parameter named "pid".
As well as the above-mentioned class file, the Trojan contains "Unicode" and "UTF" class files. The "Unicode" class file includes "lopiyo" function, which is used to decrypt the link to a downloadable file. The "UTF" class file contains a code designed to exploit a vulnerability (CVE-2010-0840).
Removal instructions
If your computer does not have antivirus protection and has been infected by this malicious program, follow the instructions below to delete it:
- Update Sun Java JRE and JDK to the latest versions.
- Delete the following file:
%Temp%\<rnd>.exe
- Empty the Temporary Internet Files directory, which may contain infected files (see How to delete infected files from Temporary Internet Files folder?).
%Temporary Internet Files%
- Perform a full scan of the computer using Kaspersky Anti-Virus with up-to-date antivirus databases (download a trial version).
MD5: 7F674D2A23CE997B6DCB12B5B2FC28D6
SHA1: C650A313A5B67C36FB2544F73C06775A31AE4521
Programs classified as Trojan-Downloader download and install new versions of malicious programs, including Trojans and AdWare, on victim computers. Once downloaded from the Internet, the programs are launched or included on a list of programs which will run automatically when the operating system boots up.
Information about the names and locations of the programs which are downloaded are in the Trojan code, or are downloaded by the Trojan from an Internet resource (usually a web page).
This type of malicious program is frequently used in the initial infection of visitors to websites which contain exploits.
Trojan-Downloader.
- Troj/JavaDl-BH (Sophos)
- Exploit:
Java/CVE-2010-0840. BV (MS(OneCare)) - Java.
Siggen. 30 (DrWeb) - Java/TrojanDownloader.
OpenStream. NBD trojan (Nod32) - Java:
OpenConnection-S [Trj] (AVAST) - Trojan-Downloader.
Java. OpenConnection (Ikarus) - Java/Downloader.
AZ (AVG) - NseCheckFile2() returned 0x00010018 (Norman)
- Trojan-Downloader:
Java/OpenConnection. AY [FSE] (FSecure)
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