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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