*Raw Log...*
2015 Mar 31 11:37:27 WinEvtLog: System: INFORMATION(1): Sysmon: Username:
SYSTEM-NAME: SYSTEM-NAME: Process Create: UtcTime: 3/31/2015
06:37:27.465 PM ProcessGuid: {7531FA7E-E967-551A-0000-0010D2A58706}
ProcessId: 5868 Image: C:\Folder\Folder\file.exe CommandLine:
C:\Folder\Folder\file.exe User: DOMAIN\Username LogonGuid:
{7531FA7E-E963-551A-0000-0020EB238706} LogonId: 0x68723eb
TerminalSessionId: 1 IntegrityLevel: no level HashType: SHA1
Hash: 19AF48C6B036E722D74FA00C4E852774236D2F38 ParentProcessGuid:
{7531FA7E-E965-551A-0000-0010038F8706} ParentProcessId: 476
ParentImage: C:\Folder\Folder\Parent.exe ParentCommandLine:
"C:\Folder\Folder\Parent.exe"
*Decoded...*
**Phase 2: Completed decoding.
decoder: 'windows'
status: 'C:\Folder\Folder\file.exe'
dstuser: 'DOMAIN\Username'
url: '19AF48C6B036E722D74FA00C4E852774236D2F38'
extra_data: 'C:\Folder\Folder\Parent.exe'
**Phase 3: Completed filtering (rules).
Rule id: '100242'
Level: '12'
Description: 'Unauthorized Process Detected'
**Alert to be generated.
*Rules...*
<rule id="100241" level="0">
<if_sid>18100</if_sid>
<list field="url">rules/lists/filelist</list>
<description>Authorized Process</description>
</rule>
<rule id="100242" level="12">
<if_sid>18100</if_sid>
<list field="url" lookup="not_match_key">rules/lists/filelist</list>
<description>Unauthorized Process</description>
</rule>
*CDB file contents...*
19AF48C6B036E722D74FA00C4E852774236D2F38:file.exe
*Goal:*
I would like to monitor a system for expected behavior and receive alerts
when unexpected behavior occurs. I have a list of SHA1 hashes of the
executables as in the CDB file contents above. I simply want an alert when
there are processes executed from this system outside of its baseline.
*Issue:*
I cannot get a MATCH to work in the CDB. Maybe its something simple and
I've just been looking at this too long. I've commented out the 100242
rule and I cannot get 100241 to work.
Much of the documentation supports no file extensions on the cdb lists in
the ossec.conf and in the rules.xml - although I can find examples where
people have included extensions...
Maybe something silly I've overlooked? Please... someone slap some sense
into me!!!
Thank you!
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