JS_EXPLOIT.SM1
Windows 2000, Windows XP, Windows Server 2003
Threat Type: Trojan
Destructiveness: No
Encrypted: Yes
In the wild: Yes
OVERVIEW
It takes advantage of the Use-after-free vulnerability in the Peer Objects component in Microsoft Internet Explorer to download possibly malicious files.
This Trojan may be hosted on a website and run when a user accesses the said website.
As of this writing, the said sites are inaccessible.
TECHNICAL DETAILS
Varies
HTML, HTM
No
29 Nov 2010
Disables services
Arrival Details
This Trojan may be hosted on a website and run when a user accesses the said website.
Download Routine
This Trojan takes advantage of the following software vulnerabilities to download possibly malicious files:
After successfully exploiting the said vulnerability, this malware connects to the following URLs to possibly download other malicious files:
- http://www.{BLOCKED}4.com/letter/o.exe
As of this writing, the said sites are inaccessible.
SOLUTION
8.900
7.656.10
29 Nov 2010
11/29/2010 12:00:00 AM
7.657.00
29 Nov 2010
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
Scan your computer with your Trend Micro product to delete files detected as JS_EXPLOIT.SM1. 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.
Step 4
Download and apply this security patch Refrain from using these products until the appropriate patches have been installed. Trend Micro advises users to download critical patches upon release by vendors. MS10-018
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