Tag Archives: Log Analysis

Have your IOCs come to you


So, you’ve got the latest list of IOCs from a recent APT / malware report, time to kick off the scanner(s) / agent(s) of you choice and wait for the results. Wouldn’t it be nice to do a quick search of your logs and have the answer in seconds?  You’re already collecting logs from your Windows hosts (right?), shouldn’t they be doing more for you than providing logs?

Windows logging tools seem to have been stuck for a while at providing just the logs. The Splunk Universal Forwarder is an excellent example of a free, modern logging tool that does more than logs, and works with more than the Splunk server (hint hint); but even it does not provide what I believe is necessary data to support cyber security, forensics, and incident response.

Why not collect process hashes, named pipes, mutexes, semaphores, loaded modules, etc., and send them with the logs? Why not have these in real-time and be able to search your entire enterprise in seconds? There are plenty of server-side tools to collect, parse, and index  all of your logs; hosted on or off-site, free or pay. So, why not? You could know within minutes every new binary that is executed, including it’s metadata. You could know the initial infection vector, have the IOCs immediately, search all your hosts simultaneously, and that’s just the beginning!

Not finding a tool (at the time) that did what I wanted, I created WLS to provide exactly that; logs and the extra data to support answers I needed. There may be other programs that do this now (I’d love to know!), and I hope that others find this data as useful as I do.

Here are some WLS logs that answer example questions:

What did Firefox launch today that was downloaded from the internet?

Mar 15 09:05:24 [host] Security: LogType=”WLS”, BaseFileName=”Firefox Setup 19.0.2.exe”, Channel=”Security”, CommandLine=”‘C:\Users\Jason\Downloads\Firefox Setup 19.0.2.exe'”, CompanyName=”Mozilla”, Computer=”[host]”, CreatorProcessName=”firefox”, EventID=”4688″, EventRecordID=”65653″, ExecutionProcessID=”4″, ExecutionThreadID=”68″, FileDescription=”Firefox”, FileVersion=”4.42″, InternalName=”7zS.sfx”, Keywords=”0x8020000000000000″, Language=”English (United States)”, Length=”20564720″, Level=”0″, MD5=”68266231DF9FAF07018BAD5E028BDE67″, NewHash=”True”, NewProcessId=”0x1744″, NewProcessName=”C:\Users\Jason\Downloads\Firefox Setup 19.0.2.exe”, Opcode=”0″, ProcessId=”0xd58″, ProductVersion=”4.42″, ProviderGuid=”{54849625-5478-4994-A5BA-3E3B0328C30D}”, ProviderName=”Microsoft-Windows-Security-Auditing”, Recent=”True”, SHA1=”D0B0B20F1365BCDE53067012FFDAD23B52688028″, Signed=”True”, SubjectDomainName=”[host]”, SubjectLogonId=”0x25e5350″, SubjectUserName=”Jason”, SubjectUserSid=”[sid]”, Task=”13312″, TokenElevationType=”%%1938″, ValidSignatureDate=”True”, Version=”0″, Zone=”3″

Has a process with the  MD5 of 626A24ED1228580B9518C01930936DF9 executed?

Mar 22 19:29:00 [host] Security: LogType=”WLS”, BaseFileName=”GoogleUpdate.exe”, Cached=”True”, Channel=”Security”, CompanyName=”Google Inc.”, Computer=”[host]”, CreatorProcessName=”taskeng”, EventID=”4688″, EventRecordID=”67948″, ExecutionProcessID=”4″, ExecutionThreadID=”48″, FileDescription=”Google Installer”, FileVersion=”1.2.131.7″, InternalName=”Google Update”, Keywords=”0x8020000000000000″, Language=”English (United States)”, Length=”133104″, Level=”0″, MD5=”626A24ED1228580B9518C01930936DF9″, NewProcessId=”0x16b4″, NewProcessName=”C:\Users\Jason\AppData\Local\Google\Update\GoogleUpdate.exe”, Opcode=”0″, ProcessId=”0xfcc”, ProductVersion=”1.2.131.7″, ProviderGuid=”{54849625-5478-4994-A5BA-3E3B0328C30D}”, ProviderName=”Microsoft-Windows-Security-Auditing”, Recent=”True”, SHA1=”DCB86149B70829BB4320811B12686AE00131DBC3″, Signed=”True”, SubjectDomainName=”[host]”, SubjectLogonId=”0x25e5350″, SubjectUserName=”Jason”, SubjectUserSid=”[sid]”, Task=”13312″, TokenElevationType=”%%1938″, ValidSignatureDate=”False”, Version=”0″, Zone=”0″

What about a named pipe that starts with “chrome”?

Mar 19 23:44:51 [host] WLS_NamedPipeMonitor: LogType=”WLS”, ChangeType=”Created”, WLSKey=”10375″, Name=”chrome.5748.0.150278265″

Anything load mpengine.dll?

Mar 22 03:21:45 [host] WLS_ModuleMonitor: LogType=”WLS”, BaseFileName=”mpengine.dll”, ChangeType=”Added”, CompanyName=”Microsoft Corporation”, WLSKey=”14514″, FileDescription=”Microsoft Malware Protection Engine”, FileName=”c:\programdata\microsoft\microsoft antimalware\definition updates\{d9b17332-a27d-4442-8ff1-793d9607fc2e}\mpengine.dll”, FileVersion=”1.1.9302.0″, InternalName=”mpengine”, Language=”English (United States)”, Length=”7108640″, MD5=”9F4003841689C663254D54177EB97219″, Process=”MsMpEng”, ProductVersion=”1.1.9302.0″, SHA1=”F2F46BBE3F931B0927B2FEFE9707C0063C6872D6″, Zone=”0″

If you’d like more information on WLS, send me a note via the contact form.