These sigs were triggered, from installation all the way through the test call that skype provides. The user-agent detections are triggered when opening the client and closing the client, it calls back to a home server. As far as I can tell this server is semi-random probably goes to some round robin dns. Bleeding-snort will take a look at the capture from this session and see if we can improve the signatures at all.
May 17 13:48:58 10.20.XX.XX snort[20246]: [1:2002157:1] BLEEDING-EDGE POLICY
Skype User-Agent detected [Classification: Potential Corporate Privacy
Violation] [Priority: 1]: {TCP} 10.20.XX.XX:2450 -> 212.72.49.131:80
May 17 13:49:37 10.20.XX.XX snort[20246]: [1:2001595:6] BLEEDING-EDGE Policy
Skype VOIP Checking Version (Startup) [Classification: Potential Corporate
Privacy Violation] [Priority: 1]: {TCP} 10.20.XX.XX:2466 -> 212.72.49.131:80
May 17 13:49:37 10.20.XX.XX snort[20246]: [1:2002157:1] BLEEDING-EDGE POLICY
Skype User-Agent detected [Classification: Potential Corporate Privacy
Violation] [Priority: 1]: {TCP} 10.20.XX.XX:2466 -> 212.72.49.131:80
William B.
CWIE Security
[EMAIL PROTECTED]
CWIE LLC
------------------------------------------
If you spend more on coffee than on IT security, you will be hacked.
What's more, you deserve to be hacked.
-- former White House cybersecurity czar Richard Clarke
>>> Vladimir Parkhaev <[EMAIL PROTECTED]> >>>
Quoting Matt Jonkman ([EMAIL PROTECTED]):
> What these vendors may be doing it trying to block access to
centralized
> login or directory servers by known IP ranges... I don't know if
that'll
> be completely effective.
>
If I understand the protocol correctly, central servers are contacted only
on a first run (after install). I(D|P)S systems can have sigs with IP
addresses of those servers, but if user X installs Skype client on his corp.
laptop at home... it doesn't help much.
--
.signature: No such file or directory
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