mirror of https://github.com/MISP/misp-training
chg: [decaying] Improved slides and changed slide order
mokaddem
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@ -12,25 +12,30 @@
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\begin{itemize}
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\item \textbf{Trust}, \textbf{data quality} and \textbf{time-to-live} issues
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\item Each user/organisation has \textbf{different use-cases} and interests
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\begin{itemize}
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\item Conflicting interests such as operational security, attribution,... (depends on the user)
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\end{itemize}
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\end{itemize}
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\item[] $\rightarrow$ Can be partially solved with \textit{Taxonomies}
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\pause
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\vspace{0.5cm}
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\item Attributes can be shared in large quantities (more than 7.3 million on \texttt{MISPPRIV})
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\begin{itemize}
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\item Partial info about their validity (sightings)
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\item Partial info about their freshness (last update)
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\item Varius conflicting interests such as operational security, attribution, source reliability evaluation... (depends on the user)
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\item Partial info about their \textbf{freshness} (\textit{sightings})
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\item Partial info about their \textbf{validity} (last update)
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\end{itemize}
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\item[] $\rightarrow$ Can be partially solved with our \textit{Decaying model}
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\end{itemize}
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\end{frame}
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\begin{frame}
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\frametitle{Sightings - Refresher}
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Sightings add temporal context to indicators.
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\frametitle{\textit{Sightings} - Refresher}
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\textit{Sightings} add temporal context to indicators.
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A user, script or an IDS can extend the information related to indicators by reporting back to MISP that
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an indicator has been \texttt{seen}, or that an indicator can be considered as a \texttt{false-positive}
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\vspace{0.5cm}
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\begin{itemize}
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\item Sightings give more credibility/visibility to indicators
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\item \textit{Sightings} give more credibility/visibility to indicators
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\item This information can be used to {\bf prioritise and decay indicators}
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\end{itemize}
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\begin{center}
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@ -42,7 +47,7 @@
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\frametitle{Organisations opt-in - setting a level of confidence}
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MISP is a peer-to-peer system, information passes through multiple instances.
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\begin{itemize}
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\item Producers can add context (such as tags from taxonomies, galaxies) about their asserted confidence or the reliability of the data
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\item Producers can add context (such as tags from \textit{taxonomies}, \textit{galaxies}) about their asserted confidence or the reliability of the data
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\item Consumers can have different levels of trust in the producers and/or analysts themselves
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\item Users might have other contextual needs
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\end{itemize}
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@ -80,7 +85,7 @@
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Fairly reliable & 50\\
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Not usually reliable & 25\\
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Unreliable & 0\\
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Reliability cannot be judged & 50\\
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Reliability cannot be judged & 50 \textbf{\color{red}?}\\
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Deliberatly deceptive & 0 \textbf{\color{red}?}\\
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\hline
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\end{tabular}
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@ -116,6 +121,48 @@
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\end{frame}
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\begin{frame}
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\frametitle{Implementation in MISP: \texttt{Event/view}}
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\includegraphics[width=1.00\linewidth]{pics/decaying-event.png}
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\end{frame}
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\begin{frame}[fragile]
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\frametitle{Implementation in MISP: API result}
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\texttt{/attributes/restSearch}
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\begin{lstlisting}
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"Attribute": [
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{
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"category": "Network activity",
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"type": "ip-src",
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"to_ids": true,
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"timestamp": "1565703507",
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[...]
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"value": "8.8.8.8",
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"decay_score": [
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{
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"score": 54.475223849544456,
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"decayed": false,
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"DecayingModel": {
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"id": "85",
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"name": "NIDS Simple Decaying Model"
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}
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}
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],
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[...]
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\end{lstlisting}
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\end{frame}
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\begin{frame}
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\frametitle{Implementation in MISP: Playing with Models}
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\begin{itemize}
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\item \textbf{Automatic scoring} based on default values
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\item \textbf{User-friendly UI} to manually set lifetime and decay parameters
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\item \textbf{Simulation} tool
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\item Interaction through the \textbf{API}
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\item Opportunity to create your \textbf{own} formula or algorythm
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\end{itemize}
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\end{frame}
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\begin{frame}
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\frametitle{Scoring Indicators: \texttt{base\_score} (1)}
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$$ \texttt{score}(\texttt{\tiny Attribute}) = \texttt{base\_score}(\texttt{\tiny Attribute, Model}) \;\;\bullet\;\; {\color{gray}\texttt{decay}(\texttt{\tiny Model, time})} $$
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@ -156,24 +203,17 @@
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\begin{frame}
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\frametitle{Scoring Indicators: putting it all toghether}
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$\rightarrow$ \texttt{decay rate} is \textbf{re-initialized upon sighting} addition, or said differently, the \texttt{score} is reset to its base score as new \texttt{sightings} are applied.
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$\rightarrow$ \texttt{decay rate} is \textbf{re-initialized upon sighting} addition, or said differently, the \texttt{score} is reset to its base score as new \textit{sightings} are applied.
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$$score = base\_score \cdot \left( 1 - \left( \frac{t}{\tau_a} \right)^{\frac{1}{\delta_a}} \right) $$
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\end{frame}
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\begin{frame}
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\frametitle{Implementation in MISP: Playing with Models}
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\begin{itemize}
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\item \textbf{Automatic scoring} based on default values
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\item \textbf{User-friendly UI} to manually set lifetime and decay parameters
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\item \textbf{Simulation} tool
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\item Interaction through the \textbf{API}
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\item Opportunity to create your \textbf{own} formula or algorythm
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\item $\tau_a = $ \texttt{lifetime}
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\item $\delta_a = $ \texttt{decay speed}
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\end{itemize}
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\end{frame}
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\begin{frame}
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\frametitle{Implementation in MISP: Models definition}
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Models are an instanciation of the formula where elements can be defined:
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\textit{Models} are an instanciation of the formula where elements can be defined:
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\begin{itemize}
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\item Parameters: \texttt{lifetime, decay\_rate, threshold}
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\item \texttt{base\_score}
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@ -220,11 +260,6 @@
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\includegraphics[width=1.00\linewidth]{pics/decaying-simulation.png}
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\end{frame}
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\begin{frame}
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\frametitle{Implementation in MISP: \texttt{Event/view}}
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\includegraphics[width=1.00\linewidth]{pics/decaying-event.png}
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\end{frame}
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\begin{frame}[fragile]
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\frametitle{Implementation in MISP: API query body}
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\texttt{/attributes/restSearch}
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@ -242,32 +277,6 @@
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\end{lstlisting}
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\end{frame}
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\begin{frame}[fragile]
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\frametitle{Implementation in MISP: API result}
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\texttt{/attributes/restSearch}
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\begin{lstlisting}
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"Attribute": [
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{
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"category": "Network activity",
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"type": "ip-src",
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"to_ids": true,
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"timestamp": "1565703507",
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[...]
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"value": "8.8.8.8",
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"decay_score": [
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{
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"score": 54.475223849544456,
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"decayed": false,
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"DecayingModel": {
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"id": "85",
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"name": "NIDS Simple Decaying Model"
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}
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}
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],
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[...]
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\end{lstlisting}
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\end{frame}
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\begin{frame}
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\frametitle{Creating a new decay algorithm (1)}
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The current architecture allows users to create their \textbf{own} formulae.
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