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4.4

Troubleshoot suspicious traffic from workstation to AD over 1025

Asked by terradmin in Windows XP Operating System

Tags: active directory, winXP Pro, port 1025, intrusion prevention, emule, obfuscated protocol

I'm at my wits end on this one & am hoping the EE community could lend a helping hand!

We started receiving intrusion prevention alerts on our SonicWall E5500 NSA after a recent firmware update.  Of ~10 workstations, only two were triggering the alert: "IPS Prevention Alert: P2P eMule -- Obfuscated Protocol, SID: 4, Priority: Low"  Source: workstation, random port; Dest: either of our DCs, port 1025

I took one of the machines offline & built a new machine for the user using a custom winXP image on different hardware.  We kept the default machine name & have not had any alerts from the device, so the user is up and running for the time being.

The odd part  here is that I wiped the user's old machine, reimage using the same image as above & flashed the BIOS.  I removed the object from AD, renamed the machine to its original, and joined the domain.  The alerts started again.  The only commonality here (that i can think of ) is the machine name.  I haven't even attempted to work on the second machine in question.  (Malware & rootkit scans have come up clean)

I have since reimaged the machine from a base XP image, with no bells and/or whistles.  Installed/updated A/V, ran all appropriate Win Updates, etc.  The alerts started again as soon as I joined the domain - inbound to the AD server(s) over 1025.

Any thoughts/help would be appreciated.  Our ultimate goal is to eradicate this & apply the same fix to the second device.
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About this solution

Zone: Windows XP Operating System
Tags: active directory, winXP Pro, port 1025, intrusion prevention, emule, obfuscated protocol
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Solution Provided By: ee_auto
Participating Experts: 3
Solution Grade: A
 
 
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