How to recover event logs from a Windows memory image
Using Volatility and EVTXtract
Usually i use a different approach based on Windows version:
Windows XP and 2003 machines
Simply use the evtlogs plugin of Volatility:
evtlogscommand extracts and parses binary event logs from memory. Binary event logs are found on Windows XP and 2003 machines, therefore this plugin only works on these architectures.
These files are extracted from VAD of the services.exe process, parsed and dumped to a specified location.
$ python vol.py -f WinXPSP1x64.vmem --profile=WinXPSP2x64 evtlogs -D output Volatility Foundation Volatility Framework 2.4 Parsed data sent to appevent.txt Parsed data sent to secevent.txt Parsed data sent to sysevent.txt
There is also an option (
--save-evt) to dump raw event logs for parsing with external tools:
$ python vol.py -f WinXPSP1x64.vmem --profile=WinXPSP2x64 evtlogs --save-evt -D output Volatility Foundation Volatility Framework 2.4 Saved raw .evt file to appevent.evt Parsed data sent to appevent.txt Saved raw .evt file to secevent.evt Parsed data sent to secevent.txt Saved raw .evt file to sysevent.evt Parsed data sent to sysevent.txt
Other Windows systems
EVTX records are XML fragments encoded using a Microsoft-specific binary XML representation. Despite the convenient format, it is not easy to recover EVTX event log records from a corrupted file or unallocated space. This is because the complete representation of a record often depends on other records found nearby. The event log service recognizes similarities among records and refactors commonalities into “templates”. A template is a fixed structure with placeholders that reserve space for variable content. The on-disk event log record structure is a reference to a template, and a list of substitutions (the variable content the replaces a placeholder in a template). To decode a record into XML, the event log service resolves the template and replaces its placeholders with the entries of the substitution array. Therefore, template corruption renders many records unrecoverable within the local 64KB “chunk”. However, the substitution array for the remaining records may still be intact. If so, it may be possible to produce XML fragments that match the original records if the damaged template can be reconstructed. For many common events, such as process creation or account logon, empirical testing demonstrates the relevant templates remain mostly constant. In these cases, recovering event log records boils down to identifying appropriate templates found in other EVTX chunks.
Install EVTXtract using pip:
pip install evtxtract
./evtxtract /path/to/evidence > /path/to/output.xml
More information and downloads
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