JAVA_EXPL.AV
TrojanDownloader:Java/OpenStream.CG (Microsoft), Downloader.a!cn3 (McAfee), Trojan.Maljava (Symantec)
Windows 2000, Windows XP, Windows Server 2003
![](/vinfo/imgFiles/legend.jpg)
Threat Type: Trojan
Destructiveness: No
Encrypted:
In the wild: Yes
OVERVIEW
This Trojan arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites. It arrives as a component bundled with malware/grayware packages. It may be hosted on a website and run when a user accesses the said website.
TECHNICAL DETAILS
6,886 bytes
Java Class
15 Sep 2012
Arrival Details
This Trojan arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.
It arrives as a component bundled with malware/grayware packages.
It may be hosted on a website and run when a user accesses the said website.
Download Routine
This Trojan saves the files it downloads using the following names:
- %User Temp%\{filename}.exe
(Note: %User Temp% is the current user's Temp folder, which is usually C:\Documents and Settings\{user name}\Local Settings\Temp on Windows 2000, XP, and Server 2003.)
NOTES:
This Trojan downloads a possibly malicious file from a certain URL. The URL where this malware downloads the said file depends on the parameter passed on to it by its components.
It executes the downloaded file using the following commands:
- regsvr32 -s "%User Temp%\{filename}.exe"
- %User Temp%\{filename}.exe
Where {filename} is any of the following:
- bawt34tv
- awt43abr
- berstrestvers
- ab43yctewatv
- bg34dfbewgba4
- a43vtzgbdgv
- tab4vrtve
- atv4tvq34
SOLUTION
9.200
9.396.02
15 Sep 2012
9.397.00
15 Sep 2012
Step 1
For Windows XP and Windows Server 2003 users, before doing any scans, please make sure you disable System Restore to allow full scanning of your computer.
Step 2
Close all opened browser windows
Step 3
Search and delete this file
There may be some component files that are hidden. Please make sure you check the Search Hidden Files and Folders checkbox in the More advanced options option to include all hidden files and folders in the search result.
- %User Temp%\{filename}.exe
Step 4
Scan your computer with your Trend Micro product to delete files detected as JAVA_EXPL.AV If the detected files have already been cleaned, deleted, or quarantined by your Trend Micro product, no further step is required. You may opt to simply delete the quarantined files. Please check this Knowledge Base page for more information.
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