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Processing Modules

Cuckoo's processing modules are Python scripts that let you define custom ways to analyze the raw results generated by the sandbox and append some information to a global container that will be later used by the signatures and the reporting modules.

You can create as many modules as you want, as long as they follow a predefined structure that we will present in this chapter.

Global Container

After an analysis is completed, Cuckoo will invoke all the processing modules available in the cuckoo/processing/ directory, all of which fall under the cuckoo.processing module. Any additional module you decide to create must be placed inside that directory.

Every module should also have a dedicated section in the $CWD/conf/processing.conf file: for example if you create a module cuckoo/processing/foobar.py you will have to append the following section to $CWD/conf/processing.conf:

[foobar]
enabled = yes

Every module will then be initialized and executed and the data returned will be appended in a data structure that we'll call global container.

This container is simply just a big Python dictionary that includes the abstracted results produced by all the modules classified by their identification key.

Cuckoo already provides a default set of modules which will generate a standard global container. It's important for the existing reporting modules (HTML report etc.) that these default modules are not modified, otherwise the resulting global container structure would change and the reporting modules wouldn't be able to recognize it and extract the information used to build the final reports.

The currently available default processing modules are:
  • AnalysisInfo (cuckoo/processing/analysisinfo.py) - generates some basic information on the current analysis, such as timestamps, version of Cuckoo and so on.
  • ApkInfo (cuckoo/processing/apkinfo.py) - generates some basic information on the current APK analysis (Android analysis).
  • Baseline (cuckoo/processing/baseline.py) - baseline results from gathered information.
  • BehaviorAnalysis (cuckoo/processing/behavior.py) - parses the raw behavioral logs and perform some initial transformations and interpretations, including the complete processes tracing, a behavioral summary and a process tree.
  • Buffer (cuckoo/processing/buffer.py) - dropped buffer analysis.
  • Debug (cuckoo/processing/debug.py) - includes errors and the analysis.log generated by the analyzer.
  • Droidmon (cuckoo/processing/droidmon.py) - extract Dynamic API calls Info From Droidmon logs.
  • Dropped (cuckoo/processing/dropped.py) - includes information on the files dropped by the malware and dumped by Cuckoo.
  • DumpTls (cuckoo/processing/dumptls.py) - cross-references TLS master secrets extracted from the monitor and key information extracted from the PCAP to dump a master secrets file.
  • GooglePlay (cuckoo/processing/googleplay.py) - Google Play information about the analysis session.
  • Irma (cuckoo/processing/irma.py) - IRMA connector.
  • Memory (cuckoo/processing/memory.py) - executes Volatility on a full memory dump.
  • Misp (cuckoo/processing/misp.py) - MISP connector.
  • NetworkAnalysis (cuckoo/processing/network.py) - parses the PCAP file and extracts some network information, such as DNS traffic, domains, IPs, HTTP requests, IRC and SMTP traffic.
  • ProcMemory (cuckoo/processing/procmemory.py) - performs analysis of process memory dump. Note: the module is able to process user defined Yara rules from data/yara/memory/index_memory.yar. Just edit this file to add your Yara rules.
  • ProcMon (cuckoo/processing/procmon.py) - extracts events from procmon.exe output.
  • Screenshots (cuckoo/processing/screenshots.py) - screenshot and OCR analysis.
  • Snort (cuckoo/processing/snort.py) - Snort processing module.
  • StaticAnalysis (cuckoo/processing/static.py) - performs some static analysis of PE32 files.
  • Strings (cuckoo/processing/strings.py) - extracts strings from the analyzed binary.
  • Suricata (cuckoo/processing/suricata.py) - Suricata processing module.
  • TargetInfo (cuckoo/processing/targetinfo.py) - includes information on the analyzed file, such as hashes.
  • VirusTotal (cuckoo/processing/virustotal.py) - searches on VirusTotal.com for antivirus signatures of the analyzed file. Note: the file is not uploaded on VirusTotal.com, if the file was not previously uploaded on the website no results will be retrieved.

Getting started

In order to make them available to Cuckoo, all processing modules must be placed inside the cuckoo/processing/ directory.

A basic processing module could look like:

Every processing module should contain:
  • A class inheriting Processing.
  • A run() function.
  • A self.key attribute defining the name to be used as a sub container for the returned data.
  • A set of data (list, dictionary, string, etc.) that will be appended to the global container.

You can also specify an order value, which allows you to run the available processing modules in an ordered sequence. By default all modules are set with an order value of 1 and are executed in alphabetical order.

If you want to change this value your module would look like:

You can also manually disable a processing module by setting the enabled attribute to False:

The processing modules are provided with some attributes that can be used to access the raw results for the given analysis:

  • self.analysis_path: path to the folder containing the results (e.g., $CWD/storage/analysis/1)
  • self.log_path: path to the analysis.log file.
  • self.file_path: path to the analyzed file.
  • self.dropped_path: path to the folder containing the dropped files.
  • self.logs_path: path to the folder containing the raw behavioral logs.
  • self.shots_path: path to the folder containing the screenshots.
  • self.pcap_path: path to the network pcap dump.
  • self.memory_path: path to the full memory dump, if created.
  • self.pmemory_path: path to the process memory dumps, if created.

With these attributes you should be able to easily access all the raw results stored by Cuckoo and perform your analytic operations on them.

As a last note, a good practice is to use the CuckooProcessingError exception whenever the module encounters an issue you want to report to Cuckoo. This can be done by importing the class like this: