SideWinder Adopts New ClickOnce-Based Attack Chain Targeting South Asian Diplomats
In a concerning development for cybersecurity professionals, a recent campaign by the threat actor known as SideWinder has brought to light a sophisticated attack targeting South Asian diplomats. The European embassy in New Delhi, along with several organizations in Sri Lanka, Pakistan, and Bangladesh, found themselves in the crosshairs of this new offensive in September 2025.
What sets this attack apart is SideWinder’s adoption of a novel PDF and ClickOnce-based infection chain. This evolution in Tactics, Techniques, and Procedures (TTPs) showcases the group’s adaptability and willingness to explore new avenues for infiltration. The use of ClickOnce technology, typically employed for deploying Windows-based applications over the internet, marks a significant shift in the group’s modus operandi.
ClickOnce technology, known for its ease of deployment and automatic updates, has now been repurposed by SideWinder to deliver malicious payloads to unsuspecting targets. By disguising their attacks within seemingly innocuous PDF files, the threat actor has found a new way to bypass traditional security measures and gain access to sensitive systems.
This shift in tactics underscores the importance of remaining vigilant and adaptable in the face of evolving cyber threats. Security teams must now not only be wary of traditional attack vectors but also stay informed about emerging techniques such as this ClickOnce-based approach.
For IT and development professionals tasked with safeguarding their organizations’ digital assets, this development serves as a stark reminder of the ever-changing landscape of cybersecurity. Implementing robust security measures, staying abreast of the latest threat intelligence, and conducting regular training sessions for employees on recognizing phishing attempts are crucial steps in mitigating risks.
Furthermore, collaboration within the cybersecurity community is essential to sharing knowledge and best practices in combating such threats. By exchanging information on emerging attack techniques and indicators of compromise, organizations can collectively strengthen their defenses against sophisticated adversaries like SideWinder.
As we continue to witness the rapid evolution of cyber threats, it is imperative that IT and development professionals remain proactive and adaptive in their approach to cybersecurity. By staying informed, investing in the right tools and technologies, and fostering a culture of security awareness within their organizations, they can effectively defend against threats like the ClickOnce-based attack chain deployed by SideWinder.
In conclusion, the recent campaign targeting South Asian diplomats by SideWinder highlights the need for a comprehensive and dynamic cybersecurity strategy. By acknowledging the shifting landscape of cyber threats and embracing a proactive mindset, organizations can better protect their digital assets and sensitive information from malicious actors. Stay informed, stay prepared, and stay vigilant in the face of evolving cyber threats.