Détection du Cheval de Troie Sunburst : Attaque de la Chaîne d’Approvisionnement Solarwinds sur FireEye et les Agences Américaines

ÉCRIT PAR

Eugene Tkachenko

Chef du programme communautaire

[post-views]

décembre 14, 2020 · 4 min de lecture

Détection du Cheval de Troie Sunburst : Attaque de la Chaîne d’Approvisionnement Solarwinds sur FireEye et les Agences Américaines

Juste quelques jours après l’information concernant la violation de données de FireEye apparue, l’entreprise a publié les résultats de son enquête et les détails du cheval de Troie Sunburst (y compris le rapport technique and contre-mesures), par lequel le groupe APT a pénétré les réseaux de plusieurs organisations, et maintenant les entreprises potentiellement compromises peuvent rapidement détecter cette menace. L’ampleur de l’attaque de la chaîne d’approvisionnement détectée est vraiment impressionnante : le groupe parrainé par l’État a compromis SolarWinds Inc. et trojanisé les mises à jour du logiciel Orion IT utilisé par l’armée américaine et les agences gouvernementales, ainsi que par 425+ des Fortune 500 américains. Les adversaires ont signé numériquement les mises à jour et les ont publiées sur le site des mises à jour de SolarWinds au printemps dernier, ce qui a laissé un grand nombre d’entreprises dans le monde compromis (les produits de SolarWinds sont utilisés par plus de 300 000 clients dans le monde).

La CISA a publié une directive d’urgence pour atténuer la compromission des produits de gestion de réseau SolarWinds Orion, avertissant de la menace potentielle posée par l’utilisation des produits SolarWinds Orion dans les réseaux de nombreuses organisations des secteurs publics et privés.

Analyse du Cheval de Troie Sunburst et Contenu de Détection

Le cheval de Troie Sunburst se cache dans SolarWinds.Orion.Core.BusinessLayer.dll. Après s’être introduit dans le système, le cheval de Troie attend jusqu’à deux semaines avant de commencer son activité nuisible. Il est capable de transférer et d’exécuter des fichiers, de profiler le système, de désactiver les services du système, et de redémarrer la machine. Le cheval de Troie Sunburst utilise le protocole du Programme d’Amélioration Orion et enregistre les données collectées dans des fichiers de configuration de plugins légitimes, rendant extrêmement difficile la détection de l’activité malveillante dans le réseau d’une organisation.

Notre équipe SOC Prime et en collaboration avec les développeurs du programme Threat Bounty ont publié des règles Sigma basées sur les contre-mesures Sunburst publiées par FireEye sur GitHub pour détecter le cheval de Troie Sunburst et les outils liés à cette attaque. L’article et la liste des règles seront mis à jour. Suivez notre blog et consultez le Threat Detection Marketplace pour les dernières règles de détection du cheval de Troie Sunburst et des menaces associées pour rester à jour.

Voici la liste des règles actuellement disponibles :

AD – Exportation de la clé maître ADFS DKM (via sysmon)

AzureAD – Modifications du jeton de rafraîchissement du Service de Jetons de Sécurité (STS)

AD – Exportation de la clé maître ADFS DKM (via événements de sécurité)

AzureAD – Utilisateur ajouté aux groupes privilégiés de l’annuaire d’Azure Active Directory

Détecteur d’activité de l’acteur de menace Dark Halo[UNC2452]

Détecteur d’attaque de la chaîne d’approvisionnement SolarWinds

AzureAD – Ajout de permission et d’affectation de rôle pour la lecture des boîtes mail de tous les boîtes de réception

AzureAD – Détection de la modification de la confiance de fédération de domaine

AzureAD – Application modifiée pour autoriser l’accès multi-locataires

Solarwinds lançant Powershell avec encodage Base64 (via ligne de commande)

Solarwinds lançant cmd.exe avec echo (via ligne de commande)

Spawn du processus adaptateur ADFS (via ligne de commande)

CSRSS.exe lancé depuis un emplacement inhabituel (possibilité d’imitation) (via ligne de commande)

Renommage de ADFind (via ligne de commande)

Arrêt suspect du Service de sauvegarde (via ligne de commande)

Détection de changement d’importance des paramètres AWS VPC

Détection de SolarWinds Solarigate (via canal nommé)

Nom d’hôte C2 du cheval de Troie Solarwinds détecté. (via SSL)

Détecte une possible activité APT DarkHalo (opérateurs BackDoor SunBurst) via la création d’archive 7Zip pour l’exfiltration de données

Hachage de l’outil FireEye Red Team détecté

Détection de l’outil de piratage AndrewSpecial

Détection de l’outil de piratage KeeFarce

Activité possible de reconnaissance sur Exchange par Dark Halo (via ligne de commande)

Nom d’hôte C2 du cheval de Troie Solarwinds détecté. (via DNS)

Nom d’hôte C2 du cheval de Troie Solarwinds détecté. (via Proxy)

Activité potentielle SUNBURST

Webshell SuperNova possible (via web)

Possibilité d’imitation Solarwinds (via proxy)

Création de fichier SolarWinds inhabituelle (via écriture de fichier)

Processus enfant SolarWinds inhabituel (via ligne de commande)

Possibilité d’utilisation get-passhashes / powerdump (via powershell)

Indicateur de compromission côté offre de SolarWinds (via chargement d’image)

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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.
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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.
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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.
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intercom-session-[xxx]	Used to keeping track of sessions and remember logins and conversations.
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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.

Détection du Cheval de Troie Sunburst : Attaque de la Chaîne d’Approvisionnement Solarwinds sur FireEye et les Agences Américaines

Analyse du Cheval de Troie Sunburst et Contenu de Détection

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