Originally Posted by Jo*mar

New IE Zero-Day Exploit Leads to PoisonIvy

[We’re currently investigating a new zero-day exploit that affects Internet Explorer versions 7, 8, and 9. The exploit, which is detected by Trend Micro as HTML_EXPDROP.II, is found to be hosted in {BLOCKED}.{BLOCKED}.104.149. Incidentally, this server also hosted the Java zero-day exploit reported last August 30.

Based on our initial analysis, when executed, HTML_EXPDROP.II drops a malicious .SWF file (SWF_DROPPR.II). The .SWF file then drops a backdoor detected as BKDR_POISON.BMN. More information the analysis will be posted in this entry.]
http://blog.trendmicro.com/trendlabs...-to-poisonivy/

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Microsoft released a patch last Friday, so hopefully your system got that security update, you might double check to see if you got it or not.