A Morocco-based cybercrime group, Storm-0539, is making headlines for its sophisticated email and SMS phishing attacks aimed at stealing and reselling gift cards. Microsoft's latest Cyber Signals report reveals that this group is responsible for significant financial theft, with some companies losing up to $100,000 daily.
First identified by Microsoft in December 2023, Storm-0539, also known as Atlas Lion, has been active since late 2021. The group employs social engineering techniques to harvest victims' credentials through adversary-in-the-middle (AitM) phishing pages. They exploit this access to register their own devices, bypass authentication, and maintain persistent access to create fraudulent gift cards.
The group's attack strategy includes gaining covert access to cloud environments for extensive reconnaissance, targeting large retailers, luxury brands, and fast-food chains. They aim to redeem and sell gift cards on black markets or use money mules to cash out.
This marks an evolution from their previous tactics of stealing payment card data via malware on point-of-sale (PoS) devices.
Microsoft noted a 30% increase in Storm-0539's activities between March and May 2024, emphasizing their deep understanding of cloud systems to manipulate gift card issuance processes.
In addition to stealing login credentials, Storm-0539 targets secure shell (SSH) passwords and keys, which are either sold or used for further attacks. The group uses internal company mailing lists to send phishing emails, enhancing their credibility and sets up new phishing websites by exploiting free trial or student accounts on cloud platforms.
The FBI has warned about Storm-0539's smishing attacks on retail gift card departments, using sophisticated phishing kits to bypass multi-factor authentication (MFA). The group's ability to adapt and pivot tactics after detection underscores their persistence and resourcefulness.
Microsoft urges companies to monitor gift card portals closely and implement conditional access policies to strengthen security. They highlight the effectiveness of using additional identity-driven signals, such as IP address and device status, alongside MFA.
Meanwhile, Enea researchers have identified broader criminal campaigns exploiting cloud storage services like Amazon S3 and Google Cloud Storage for SMS-based gift card scams. These scams use legitimate-looking URLs to bypass firewalls and redirect users to malicious websites that steal sensitive information.
Storm-0539's operations exemplify the increasing sophistication of financially motivated cybercriminals, borrowing techniques from state-sponsored actors to remain undetected. As these threats evolve, robust cybersecurity measures and vigilant monitoring are crucial to protect sensitive information and financial assets.
