Re: [clamav-users] Generating signatures for malware

2012-08-31 Thread G.W. Haywood
Hi there, On Fri, 31 Aug 2012, Maarten Broekman wrote: I see where your confusion comes from. I'm not generating pdb signatures. I'm generating ndb signatures ... Sorry, bit of a senior moment there. They seem to be creeping up on me lately. :( I had to go back and read

Re: [clamav-users] Generating signatures for malware

2012-08-30 Thread G.W. Haywood
Hello again, On Thu, 30 Aug 2012, Maarten Broekman wrote: Some of the phishing content that I'm finding is resulting in hex dumps in the 10k+ character range and I think it's more dangerous to replace sections with '*' than to replace certain substrings with specific length wildcards. This

Re: [clamav-users] Generating signatures for malware

2012-08-30 Thread Dennis Peterson
On 8/30/12 4:21 AM, G.W. Haywood wrote: Please would someone explain to me the use of {7-8}? I do not recognize it as valid regular expression syntax. Here is an example used in a Sane Security signature: http://sane.mxuptime.com/s.aspx?id=Sanesecurity.Phishing.Auction.1749 It is an

Re: [clamav-users] Generating signatures for malware

2012-08-29 Thread G.W. Haywood
Hi there, On Wed, 29 Aug 2012, Maarten Broekman wrote: Does anyone know of a tool that would take strings in a hex signature and turn them into appropriate wildcards? For instance, I want to strip out all the http://; and https://; and replace them with {7-8} Your suggested replacement does

Re: [clamav-users] Generating signatures for malware

2012-08-29 Thread Maarten Broekman
-Original Message- Despite the statement of your objective it isn't clear to me what you think you're going to achieve. My expectation would be a very large increase in the false positive rates if you attempt to use signatures modified in the way you describe. Can you be more

Re: [clamav-users] Generating signatures for malware

2012-08-29 Thread Michael Orlitzky
On 08/29/2012 09:46 AM, Maarten Broekman wrote: -Original Message- Despite the statement of your objective it isn't clear to me what you think you're going to achieve. My expectation would be a very large increase in the false positive rates if you attempt to use signatures modified

Re: [clamav-users] Generating signatures for malware

2012-08-29 Thread David Raynor
On Wed, Aug 29, 2012 at 10:29 AM, Michael Orlitzky mich...@orlitzky.comwrote: On 08/29/2012 09:46 AM, Maarten Broekman wrote: -Original Message- Despite the statement of your objective it isn't clear to me what you think you're going to achieve. My expectation would be a very

Re: [clamav-users] Generating signatures for malware

2012-08-29 Thread Maarten Broekman
-Original Message- The rate of false positives is wholly dependent on the strings that you are replacing with wildcards. As an example, when generating signatures to identify phishing content (say, content targeting bank customers), I wanted to be able to strip out

[clamav-users] Generating signatures for malware

2012-08-28 Thread Maarten Broekman
Does anyone know of a tool that would take strings in a hex signature and turn them into appropriate wildcards? For instance, I want to strip out all the http://; and https://; and replace them with {7-8} to reduce the size of the signature and get more 'useful' strings in the signature? There