R: Question regarding regular expressions and prelude-lml

All, 

I have been working on creating [ regex= ] rules for the windows snare 
agent within prelude-lml and I am experiencing a very peculiar issue where 
some messages are just not being matched, even if I change the regex to 
something global like 

regex=.+

I get tons of messages with the following

no appropriate format defined for log entry;

I am wondering if control characters mess up the regex parsing ??  Are 
there limitations in the use of the PCRE regex engine? 

Summary of steps to get a regex:

1. I am creating the initial regex in a perl script for each line I would 
like to match within an LML rule. Upon successful testing within the perl 
script I copy that regex to an LML rule file 

next if (/.+Security.+(538)\s+Security\s+(\w+|\w+\$|\w+\-\w+\$|ANONYMOUS 
LOGON)\s+(\w+ \w+ \w+|\w+)\s+Success Audit\s+(\w+).+User Logoff:\s+User 
Name:\s(\w+\$|\s+|\w+)\s+Domain:\s(\w+|\s+)\s+Logon ID: 
(\(\S+,\S+\))\s+Logon Type:\s(\d+)/);

2. I create the a LML rule to use the new created regex 

regex=(540)\s+Security\s+(\w+|\w+\$|\w+\-\w+\$|ANONYMOUS LOGON)\s+(\w+ \w+ 
\w+|\w+)\s+Success Audit\s+(\S+).+Successful Network Logon:\s+User 
Name:\s(\w+\$|\s+|\w+)\s+Domain:\s(\w+|\s+)\s+Logon ID: 
(\(\S+,\S+\))\s+Logon Type:\s(\d+)\s+Logon Process:\s(\w+).+Workstation 
Name:\s(\s+|\w+)\s+Logon GUID:\s.+Source Network 
Address:\s(204.146.116.99)\s+Source Port: (\d+|-); \
 classification.text=Web Proxy Authentication; \
 classification.reference(0).origin=vendor-specific; \
 classification.reference(0).meaning=Windows Event ID; \
 classification.reference(0).name=$1; \
 id=6003; \
 revision=1; \
 analyzer(0).name=SNARE; \
 
analyzer(0).manufacturer=http://www.intersectalliance.com/projects/SnareWindows; 
\
 analyzer(0).class=Logging; \
 assessment.impact.severity=low; \
 assessment.impact.completion=succeeded; \
 assessment.impact.type=user; \
 assessment.impact.description=$2 authenticated to Web Proxy ($6 domain $4 
dc); \
 source(0).process.name=$9; \
 source(0).node.category=nt; \
 source(0).node.address(0).category=ipv4-addr; \
 source(0).node.address(0).address=$11; \
 source(0).node.name=$10; \
 source(0).user.category=os-device; \
 source(0).user.user_id(0).type=current-user; \
 source(0).user.user_id(0).name=$2; \
 target(0).node.category=nt; \
 target(0).node.address(0).category=ipv4-addr; \
 target(0).node.address(0).address=$4; \
 target(0).node.name=$4; \
 target(0).user.category=os-device; \
 target(0).user.user_id(0).type=target-user; \
 target(0).user.user_id(0).name=$2; \
 additional_data(0).type=integer; \
 additional_data(0).meaning=Logon Type; \
 additional_data(0).data=$8; \
 additional_data(1).type=string; \
 additional_data(1).meaning=Logon ID; \
 additional_data(1).data=$7; \
 additional_data(2).type=string; \
 additional_data(2).meaning=Authentication domain; \
 additional_data(2).data=$6; \

3.

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Justin Buhler, CISSP
Information Security Specialist

Zoot Enterprises, Inc    www.zootweb.com
555 Zoot Enterprises Lane
Bozeman, MT  59718
406-586-5050 x7455
direct: 406-556-7455  fax: 406-586-8005
Zoot Technical Support - 406-586-5050 x5 x2
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