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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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2024-04-11 13:27:54 | Revisiter MACT: Applications malveillantes dans des locataires cloud crédibles Revisiting MACT: Malicious Applications in Credible Cloud Tenants (lien direct) |
For years, the Proofpoint Cloud Research team has been particularly focused on the constantly changing landscape of cloud malware threats. While precise future predictions remain elusive, a retrospective examination of 2023 enabled us to discern significant shifts and trends in threat actors\' behaviors, thereby informing our projections for the developments expected in 2024. There is no doubt that one of the major, and most concerning, trends observed in 2023 was the increased adoption of malicious and abused OAuth applications by cybercriminals and state-sponsored actors. In January, Microsoft announced they, among other organizations, were targeted by a sophisticated nation-state attack. It seems that the significant impact of this attack, which was attributed to TA421 (AKA Midnight Blizzard and APT29), largely stemmed from the strategic exploitation of pre-existing OAuth applications, coupled with the creation of new malicious applications within compromised environments. Adding to a long list of data breaches, this incident emphasizes the inherent potential risk that users and organizations face when using inadequately protected cloud environments. Expanding on early insights shared in our 2021 blog, where we first explored the emerging phenomenon of application creation attacks and armed with extensive recent discoveries, we delve into the latest developments concerning this threat in our 2024 update. In this blog, we will: Define key fundamental terms pertinent to the realm of cloud malware and OAuth threats. Examine some of the current tactics, techniques, and procedures (TTPs) employed by threat actors as part of their account-takeover (ATO) kill chain. Provide specific IOCs related to recently detected threats and campaigns. Highlight effective strategies and solutions to help protect organizations and users against cloud malware threats. Basic terminology OAuth (Open Authorization) 2.0. OAuth is an open standard protocol that enables third-party applications to access a user\'s data without exposing credentials. It is widely used to facilitate secure authentication and authorization processes. Line-of-business (LOB) applications. LOB apps (also known as second-party apps) typically refer to applications created by a user within their cloud environment in order to support a specific purpose for the organization. Cloud malware. A term usually referring to malicious applications created, utilized and proliferated by threat actors. Malicious apps can be leveraged for various purposes, such as: mailbox access, file access, data exfiltration, internal reconnaissance, and maintaining persistent access to specific resources. MACT (Malicious Applications Created in Compromised Credible Tenants). A common technique wherein threat actors create new applications within hijacked environments, exploiting unauthorized access to compromised accounts to initiate additional attacks and establish a persistent foothold within impacted cloud tenants. Apphish. A term denoting the fusion of cloud apps-based malware with phishing tactics, mainly by utilizing OAuth 2.0 infrastructure to implement open redirection attacks. Targeted users could be taken to a designated phishing webpage upon clicking an app\'s consent link. Alternatively, redirection to a malicious webpage could follow authorizing or declining an application\'s consent request. Abused OAuth applications. Benign apps that are authorized or used by attackers, usually following a successful account takeover, to perform illegitimate activities. What we are seeing Already in 2020, we witnessed a rise in malicious OAuth applications targeting cloud users, with bad actors utilizing increasingly sophisticated methods such as application impersonation and diverse lures. In October 2022, Proofpoint researchers demonstrated how different threat actors capitalized on the global relevance of the COVID-19 pandemic to spread malware and phishing threats. Proofpoint has also seen this trend include the propagation of malicious OAuth applications seamlessly integ | Malware Threat Prediction Cloud | APT 29 | ★★★ |
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