Maltrail IOC Feed Update for Multiple Threats

This threat brief highlights indicators of compromise (IOCs) identified on March 15, 2026, through the Maltrail feed. The identified IOCs are associated with a variety of threat actors and malware families, targeting both macOS and Android operating systems. The threats include OSX_Atomic, which potentially delivers malware to macOS systems; FakeApp, used for deceptive applications; Android_Joker, a known Android malware family; Lummack2, an information stealer; APT_Sidewinder, an advanced persistent threat actor; APT_Kimsuky, another APT group; and Hak5Cloud_C2, related to Hak5 Cloud Command and Control infrastructure. This diverse set of IOCs underscores the wide range of threats organizations face and the importance of monitoring network traffic and system logs for malicious activity. This data is crucial for detection engineers to build and deploy relevant detection rules to protect their environments.

Attack Chain

1. Initial Access (OSX_Atomic/FakeApp): User downloads a seemingly legitimate application from a compromised website (e.g., appsformacs.com, torrents4mac.com, or a FakeApp site like adhushapp-razvd.com).
2. Execution (OSX_Atomic/FakeApp): The downloaded application is executed on the user's macOS or Android device. This may involve bypassing security warnings or exploiting vulnerabilities.
3. Persistence (OSX_Atomic/Android_Joker): The malware establishes persistence on the system, potentially using techniques such as modifying startup items or scheduled tasks (OSX_Atomic), or registering as a background service (Android_Joker).
4. Command and Control (Multiple): The malware connects to a command-and-control (C2) server (e.g., c2.socops.net, onev.online) to receive instructions and exfiltrate data.
5. Credential Theft (Lummack2): The malware attempts to steal credentials stored on the system or in web browsers, potentially using keylogging or form grabbing techniques (Lummack2). Observed communicating with police-center.vg.
6. Data Exfiltration (Multiple): Sensitive data, such as credentials, financial information, or personal data, is exfiltrated to the C2 server.
7. Lateral Movement (APT_Sidewinder/APT_Kimsuky): The attacker uses the compromised system to move laterally within the network, targeting other systems and data. APT_Sidewinder uses domains like visa.nadra.gov-pk.info while APT_Kimsuky leverages naver.liferod.com for potential C2 or phishing activities.
8. Impact (Multiple): The attacker achieves their objectives, which may include financial gain (through fraud or extortion), intellectual property theft, or espionage.

Impact

The identified IOCs represent a diverse range of threats that can have significant impact on organizations and individuals. Successful attacks can lead to financial losses due to fraud or ransomware, data breaches resulting in the theft of sensitive information, and reputational damage. The targeting of macOS and Android devices indicates a broad scope of potential victims, encompassing both corporate and personal devices. The involvement of APT groups like APT_Sidewinder and APT_Kimsuky suggests potential for targeted attacks with significant impact on national security or critical infrastructure. A single successful infection can lead to widespread compromise within an organization's network.

Recommendation

• Block the malicious domains listed in the IOC table at the DNS resolver and firewall to prevent communication with known C2 infrastructure.
• Implement a network intrusion detection system (NIDS) rule to detect connections to the malicious domains and URLs (IOCs) to identify potentially compromised systems.
• Deploy the Sigma rules provided below to your SIEM and tune them for your specific environment to detect suspicious process execution and network connections.
• Investigate systems communicating with any of the listed IOCs (domains/URLs) for signs of malware infection or unauthorized access.