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Outlook 2003 Virus?

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2 replies

by russellrl2

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One of the users of Outlook 2003 on an Exchange Server 2003 system is receiving Undeliverable: .... messages that appear to have been sent by him. These are all Russian emails. He does not see anything in his sent folder indicating he has sent these. The Symantec virus scanner does not pick up anything. Is there a way to determine if his Outlook has a virus?

2 replies

by charliespencer

but it may not be on your user's computer.

Scenario: Imagine there are only four computers in the world: yours, your user's, mine, and a cracker. You and your user are in my address book.

The cracker sends me an e-mail with a malware program. I foolishly open it and the program installs itself. It reads my address book and picks your user's name at random. It sends itself to everyone in my address book except that randomly chosen name, claiming to be from that name. By doing this, it makes it harder to track down the actual infected computer (mine). Your e-mail filter sees the contaminated message addressed to you from my computer and rejects it. It sends an "Undeliverable" message not to me but to your user, since that's where the message says it came from.

Clear enough? I'd still follow LocoLobo's suggestions, but if all scans turn up clean, I wouldn't worry about it. Somebody with a contaminated machine has your user's address in their book and pretending to be him.

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