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2024-04-12 06:00:03 | Arrêt de cybersécurité du mois: vaincre les attaques de création d'applications malveillantes Cybersecurity Stop of the Month: Defeating Malicious Application Creation Attacks (lien direct) |
This blog post is part of a monthly series, Cybersecurity Stop of the Month, which explores the ever-evolving tactics of today\'s cybercriminals. It focuses on the critical first three steps in the attack chain in the context of email threats. The goal of this series is to help you understand how to fortify your defenses to protect people and defend data against emerging threats in today\'s dynamic threat landscape. The critical first three steps of the attack chain-reconnaissance, initial compromise and persistence. So far in this series, we have examined these types of attacks: Supplier compromise EvilProxy SocGholish eSignature phishing QR code phishing Telephone-oriented attack delivery (TOAD) Payroll diversion MFA manipulation Supply chain compromise Multilayered malicious QR code attack In this post, we examine an emerging threat-the use of malicious cloud applications created within compromised cloud tenants following account takeover. We refer to it as MACT, for short. Background Cloud account takeover (ATO) attacks are a well-known risk. Research by Proofpoint found that last year more than 96% of businesses were actively targeted by these attacks and about 60% had at least one incident. Financial damages reached an all-time high. These findings are unsettling. But there is more for businesses to worry about. Cybercriminals and state-sponsored entities are rapidly adopting advanced post-ATO techniques. And they have embraced the use of malicious and abused OAuth apps. In January 2024, Microsoft revealed that a nation-state attacker had compromised its cloud environments and stolen valuable data. This attack was attributed to TA421 (aka Midnight Blizzard and APT29), which are threat groups that have been attributed to Russia\'s Foreign Intelligence Service (SVR). Attackers exploited existing OAuth apps and created new ones within hijacked cloud tenants. After the incident, CISA issued a new advisory for businesses that rely on cloud infrastructures. Proofpoint threat researchers observed attackers pivoting to the use of OAuth apps from compromised-and often verified-cloud tenants. Threat actors take advantage of the trust that\'s associated with verified or recognized identities to spread cloud malware threats as well as establish persistent access to sensitive resources. The scenario Proofpoint monitors a malicious campaign named MACT Campaign 1445. It combines a known tactic used by cloud ATO attackers with new tactics, techniques and procedures. So far, it has affected dozens of businesses and users. In this campaign, attackers use hijacked user accounts to create malicious internal apps. In tandem, they also conduct reconnaissance, exfiltrate data and launch additional attacks. Attackers use a unique anomalous URL for the malicious OAuth apps\' reply URL-a local loopback with port 7823. This port is used for TCP traffic. It is also associated with a known Windows Remote Access Trojan (RAT). Recently, Proofpoint researchers found four accounts at a large company in the hospitality industry compromised by attackers. In a matter of days, attackers used these accounts to create four distinct malicious OAuth apps. The threat: How did the attack happen? Here is a closer look at how the attack unfolded. Initial access vectors. Attackers used a reverse proxy toolkit to target cloud user accounts. They sent individualized phishing lures to these users, which enabled them to steal their credentials as well as multifactor authentication (MFA) tokens. A shared PDF file with an embedded phishing URL that attackers used to steal users\' credentials. Unauthorized access (cloud account takeover). Once attackers had stolen users\' credentials, they established unauthorized access to the four targeted accounts. They logged in to several native Microsoft 365 sign-in apps, including “Azure Portal” and “Office Home.” Cloud malware (post-access OAuth app creat | Spam Malware Tool Threat Cloud | APT 29 | ★★★ |
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