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SideWinder, a known advanced persistent threat (APT) group, has launched a sophisticated spear-phishing campaign targeting diplomatic and governmental organizations in South Asia, including a European embassy in New Delhi and entities in Sri Lanka, Pakistan, and Bangladesh. The group has evolved its tactics by adopting a novel infection chain that leverages PDF and ClickOnce-based payloads, in addition to previously used Microsoft Word exploits, to deliver malware such as ModuleInstaller and StealerBot. These attacks, observed in multiple waves from March through September 2025, are designed to compromise sensitive systems and exfiltrate confidential data.
The StealerBot malware, a .NET-based implant, is capable of launching reverse shells, delivering additional payloads, and harvesting a wide range of information including screenshots, keystrokes, passwords, and files from infected hosts. ModuleInstaller acts as a downloader for subsequent malicious components. This campaign demonstrates a significant evolution in SideWinder's tactics, techniques, and procedures (TTPs), with phishing emails crafted to appear as official diplomatic communications, using document titles referencing inter-ministerial meetings and regional conflicts. The campaign underscores the persistent threat posed by SideWinder to South Asian diplomatic and governmental targets through advanced social engineering and malware delivery techniques.
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1 event from the most recent confirmed update back to the earliest known activity.
Researchers reported that the SideWinder APT shifted to a new attack chain using PDF lures and Microsoft ClickOnce to target diplomatic entities in South Asia. The campaign was described as delivering StealerBot as part of the intrusion workflow.
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A sophisticated phishing campaign targeting Indian entities has been attributed to the SideWinder advanced persistent threat group. Attackers impersonate the Indian Income Tax Department by sending tax-themed emails that urge recipients to review an inspection document. These emails contain links to a fake tax portal closely mimicking the legitimate government site, which then delivers a malicious ZIP archive. The archive includes a renamed, signed Microsoft Defender binary and a malicious DLL, exploiting DLL side-loading to install a Windows backdoor. The malware performs geofencing by checking the victim's timezone and only proceeds if it matches South Asian regions, thereby targeting Indian organizations specifically. Once installed, the backdoor enables file theft, data capture, and remote control by the attackers, with connections observed to known SideWinder command-and-control servers. Security researchers have noted a surge in tax-themed phishing and malware campaigns during the Indian tax filing season, leveraging public discussions about refunds to increase credibility. The spear-phishing emails often originate from suspicious domains and use embedded images to bypass spam filters, further enhancing their effectiveness. The infection chain is multi-stage, ultimately deploying persistent remote access trojans or infostealers. These campaigns highlight the evolving tactics of threat actors in targeting Indian businesses and government-related entities through highly convincing social engineering and technical subterfuge.
Jun 29, 2026
The **SideWinder** espionage group, also tracked as **RagaSerpent** and suspected to be India-linked, has expanded targeted operations across Southeast Asia, including **Thailand** and **Indonesia**, with victims spanning government, telecommunications, critical infrastructure, maritime, logistics, and nuclear-sector organizations. Reporting indicates the campaign remains focused on intelligence collection and long-term access rather than disruption, with operators using spear-phishing, stolen credentials, older Microsoft Office vulnerabilities, and DLL hijacking to gain entry into victim environments. Researchers said the group offsets these relatively simple intrusion methods with disciplined post-compromise tradecraft, including staged payload delivery, persistence through Windows services, and rapidly rotating command-and-control infrastructure. A notable feature of recent activity is malware that derives its C2 configuration dynamically at runtime, allowing operators to shift infrastructure without rebuilding payloads and complicating remediation. Separate reporting also links **RagaSerpent** to a multi-country targeted intrusion chain described as a SideWinder-adjacent **"Tax Audit"** cluster, reinforcing concerns that the threat actor is sustaining broad regional espionage activity and pre-positioning inside networks for strategic access.
Jun 29, 2026
Trellix reported that the **SideWinder** threat group is using Microsoft **ClickOnce** deployment as part of an espionage campaign, marking a shift in delivery technique for a long-running cyber-espionage actor. The activity indicates a continued focus on stealthy initial access and execution methods that can blend into legitimate Windows and enterprise software workflows, helping the group deliver malicious payloads while reducing suspicion among targeted users. The campaign reflects SideWinder’s ongoing adaptation of tradecraft to support intelligence collection against selected targets. By leveraging a trusted application deployment mechanism rather than more conventional malware lures alone, the operators appear to be refining persistence and execution pathways in ways that complicate detection and response for defenders monitoring phishing, endpoint execution, and abuse of legitimate Microsoft technologies.
Jul 12, 2026