Custom signatures
I'm trying to create custom signatures to discover a foto \.zip [a - z] file in any incoming or outgoing email. Can I use the ATOMIC. TCP and look on port 25, or set up a SERVICE. Signature of SMTP and how you setthose to the top? Also, I'm looking at someone who was going to a URL with the words inside b.jpg? Is this a SERVICE. HTTP or what?
Thank you and your help would be very appreciated.
Dwane
For your first question: S113 signature which will be published in the near future find the new Bagle.AI virus. To write a signature that detects the attachment, you can use the STRING. TCP. You look for something like:
CHAIN engine. TCP
Activated in real
Severity of information
AlarmThrottle in a nutshell
CapturePacket False
Direction ToService
MinHits 1
Protocol = TCP
RegexString [Ff] [Ii] [he's] [Ee] [Nn] [Aa] [Mm] [Ee] [=] [""] [Ff] [Oo] [Tt] [Oo] [a-zA-Z] [.] [Zz] [Ii] [Pp] [""]
ResetAfterIdle 15
ServicePorts 25
StorageKey = STREAM
Your second question:
You use the SERVICE. HTTP and your signature might look like:
SERVICE engine. HTTP
Activated in real
Severity of information
GIS test string Info
AlarmThrottle in a nutshell
CapturePacket False
True DeObfuscate
MinHits 1
Protocol = TCP
ResetAfterIdle 15
ServicePorts #WEBPORTS
StorageKey = STREAM
AaBb SummaryKey
ThrottleInterval 15
UriRegex. * [Bb] [..] [Jj] [Pp] [Gg]
Tags: Cisco Security
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