TI-Feeds in ArcSight einspielen ohne Fehlalarme auszulösen

GESCHRIEBEN VON

Aleks Bredikhin

CTO, Mitgründer

[post-views]

Juli 26, 2017 · 2 min zu lesen

TI-Feeds in ArcSight einspielen ohne Fehlalarme auszulösen

Jeder ArcSight-Benutzer oder Administrator steht vor der Herausforderung, falsche positive Regeltriggers zu erleben, während er einen Bedrohungsnachrichten-Feed in ArcSight einspeist.
Dies geschieht meist, wenn Ereignisse aus Bedrohungsquellen nicht von der Regelbedingung ausgeschlossen werden oder der Connector versucht, alle verarbeiteten IP-Adressen und Hostnamen aufzulösen.

Die Einhaltung dieser einfachen Regeln hilft Ihnen, falsche positive Korrelationen zu vermeiden:

Installieren Sie einen separaten Syslog SmartConnector für alle TI-Feeds. Dies ist für alle Bedrohungsnachrichten-Feeds relevant, die IOCs in CEF-Ereignissen über Syslog senden.
Installieren Sie einen separaten File Reader SmartConnector (zum Beispiel für CSV-Dateien). Dies ist relevant für IOCs in CSV-Dateien.
Schalten Sie ‚Namensauflösung‚ auf Syslog/File Reader SmartConnector für Bedrohungsnachrichten-Feeds aus. Wenn die Option ‚Namensauflösung aktivieren‚ auf ‚Yes‚ oder ‚Nur Quelle/Ziel‚ gesetzt ist, versucht der Connector, alle Hostnamen in IP-Adressen und IP-Adressen in Hostnamen im Quell-/Ziel-Feld aufzulösen. Wenn Sie mehrere Active Directory-Controller in Ihrem Netzwerk haben, kann dies zahlreiche DNS-Anfragen für bösartige Hosts von jedem Domain-Controller verursachen.
Außerdem kann der Connector versuchen, den NETBIOS-Namen des Hosts bei der Auflösung abzurufen, und Sie erhalten ein Ereignis auf Ihrer Firewall, dass der Server, auf dem der Bedrohungsnachrichten-Feed SmartConnector installiert ist, versucht, einen ’schlechten‘ Host auf Port 137 zu erreichen.
Schließen Sie Ereignisse vom Bedrohungsnachrichten-Feed SmartConnector in Regeln aus. Sie können jeder Regel eine Bedingung hinzufügen, beispielsweise: ‚Agentenname != TI-Connector-Name‚.

Als Ergebnis erhalten Sie viele überflüssige Ereignisse, die falsche positive Regeltriggers verursachen.

Um die Option ‚Namensauflösung‚ an einem Connector zu deaktivieren, gehen Sie zu:

In der ESM-Konsole: Doppelklicken Sie auf den Connector. Öffnen Sie im ‚Inspektieren/Bearbeiten‚-Panel die Registerkarte ‚Standardwerte‚ und wählen Sie ‚Namensauflösung aktivieren‚ im Abschnitt ‚Netzwerk‚ – ‚No‚. Klicken Sie auf ‚Übernehmen‚.
Am Connector: Führen Sie den Befehl ‚%CONNECTORHOME%/current/bin/./runagentsetup.sh‚ unter Linux oder führen Sie die Datei ‚%CONNECTORHOME%currentbinrunagentsetup.bat‚ unter Windows aus. Wählen Sie ‚Connector ändern’ -> ‘Ziel hinzufügen, ändern oder entfernen‚ -> Ziel wählen -> ‚Zieleinstellungen ändern‚ -> ‚Netzwerk‚ -> ‚Namensauflösung aktivieren‚ auf ‚No‚.
Beenden Sie die Connector-Konfiguration und starten Sie den Connector-Dienst neu.

In allen Use Cases von SOC Prime sind TI-Quellenereignisse in den Hauptfiltern ausgeschlossen.

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Name	Descripiton
PHPSESSID	Preserves user session state across page requests. Cookie generated by applications based on the PHP language. This is a general purpose identifier used to maintain user session variables. It is normally a random generated number, how it is used can be specific to the site, but a good example is maintaining a logged-in status for a user between pages.
sp_i	Used to store information about authenticated User.
sp_r	Used to store information about authenticated User.
sp_a	Used to store information about authenticated User.

Name	Descripiton
tuuid	Collects anonymous data related to the user's visits to the website, such as the number of visits, average time spent on the website and what pages have been loaded.
tuuid_last_update	Collects anonymous data related to the user's visits to the website, such as the number of visits, average time spent on the website and what pages have been loaded.
um	Collects anonymous data related to the user's visits to the website, such as the number of visits, average time spent on the website and what pages have been loaded.
umeh	Collects anonymous data related to the user's visits to the website, such as the number of visits, average time spent on the website and what pages have been loaded.
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APID	Collects anonymous data related to the user's visits to the website.
IDSYNC	Collects anonymous data related to the user's visits to the website.
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dpm	Via a unique ID that is used for semantic content analysis, the user's navigation on the website is registered and linked to offline data from surveys and similar registrations to display targeted ads.
acs	Collects anonymous data related to the user's visits to the website, such as the number of visits, average time spent on the website and what pages have been loaded, with the purpose of displaying targeted ads.
clid	Collects anonymous data related to the user's visits to the website, such as the number of visits, average time spent on the website and what pages have been loaded, with the purpose of displaying targeted ads.
KRTBCOOKIE_#	Registers a unique ID that identifies the user's device during return visits across websites that use the same ad network. The ID is used to allow targeted ads.
PUBMDCID	Registers a unique ID that identifies the user's device during return visits across websites that use the same ad network. The ID is used to allow targeted ads.
PugT	Registers a unique ID that identifies the user's device during return visits across websites that use the same ad network. The ID is used to allow targeted ads.
ssi	Registers a unique ID that identifies a returning user's device. The ID is used for targeted ads.
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wam-sync	Used by the advertising platform Weborama to determine the visitor's interests based on pages visits, content clicked and other actions on the website.
wui	Used by the advertising platform Weborama to determine the visitor's interests based on pages visits, content clicked and other actions on the website.
AFFICHE_W	Used by the advertising platform Weborama to determine the visitor's interests based on pages visits, content clicked and other actions on the website.
B	Collects anonymous data related to the user's website visits, such as the number of visits, average time spent on the website and what pages have been loaded. The registered data is used to categorise the users' interest and demographical profiles with the purpose of customising the website content depending on the visitor.
1P_JAR	These cookies are used to gather website statistics, and track conversion rates.
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HSID	Google set a number of cookies on any page that includes a Google reCAPTCHA. While we have no control over the cookies set by Google, they appear to include a mixture of pieces of information to measure the number and behaviour of Google reCAPTCHA users.
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Name	Descripiton
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intercom-id-[xxx]	This cookie is used by Intercom as a session so that users can continue a chat as they move through the site.
intercom-session-[xxx]	Used to keeping track of sessions and remember logins and conversations.
demdex	Via a unique ID that is used for semantic content analysis, the user's navigation on the website is registered and linked to offline data from surveys and similar registrations to display targeted ads.
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_gat	Used by Google Analytics to throttle request rate. This cookie name is associated with Google Universal Analytics, according to documentation it is used to throttle the request rate - limiting the collection of data on high traffic sites. It expires after 10 minutes.
_gid	This cookie name is asssociated with Google Universal Analytics. This appears to be a new cookie and as of Spring 2017 no information is available from Google. It appears to store and update a unique value for each page visited. Registers a unique ID that is used to generate statistical data on how the visitor uses the website.
IDE	Used by Google DoubleClick to register and report the website user's actions after viewing or clicking one of the advertiser's ads with the purpose of measuring the efficacy of an ad and to present targeted ads to the user.
r/collect	Used by Google DoubleClick to register and report the website user's actions after viewing or clicking one of the advertiser's ads with the purpose of measuring the efficacy of an ad and to present targeted ads to the user.
test_cookie	Used to check if the user's browser supports cookies.
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khaos	Registers anonymised user data, such as IP address, geographical location, visited websites, and what ads the user has clicked, with the purpose of optimising ad display based on the user's movement on websites that use the same ad network.
put_#	Registers anonymised user data, such as IP address, geographical location, visited websites, and what ads the user has clicked, with the purpose of optimising ad display based on the user's movement on websites that use the same ad network.
rpb	Registers anonymised user data, such as IP address, geographical location, visited websites, and what ads the user has clicked, with the purpose of optimising ad display based on the user's movement on websites that use the same ad network.
rpx	Registers anonymised user data, such as IP address, geographical location, visited websites, and what ads the user has clicked, with the purpose of optimising ad display based on the user's movement on websites that use the same ad network.
tap.php	Registers anonymised user data, such as IP address, geographical location, visited websites, and what ads the user has clicked, with the purpose of optimising ad display based on the user's movement on websites that use the same ad network.

TI-Feeds in ArcSight einspielen ohne Fehlalarme auszulösen

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