Old Snake, New Skin: Analysis of SideWinder https://www.group-ib.com/resources/research-hub/sidewinder-apt/ Page 1 of 7 APT activity in 2021 Group-IB Threat Intelligence team uncovered a previously undocumented spear phishing campaign carried out by APT SideWinder between June and November 2021. The new threat report details how SideWinder, also known as Rattlesnake, Hardcore Nationalist (HN2), and T-APT4, attempted to target dozens of government organizations in the Asia-Pacific over a period of 6 months. Delve into the group’s entire arsenal, network infrastructure, as well as its TTPs (Tactics, Techniques, and Procedures). Key highlights from SideWinder’s prolific 2021 campaign 61 identified targets in the government, military, financial, law enforcement, and political sectors 5 countries (Afghanistan, Bhutan, Myanmar, Nepal, Sri Lanka) where SideWinder carried out its 2021 phishing campaign Phishing mimicking cryptocurrency indicates the group’s growing interest in the crypto industry Download report https://www.group-ib.com/resources/research-hub/sidewinder-apt/ Page 2 of 7 BabyElephant and SideWinder are most likely the same or closely related APTs Successful 2020 attack on the Maldivian government attributed to SideWinder by Group-IB Telegram has been used by SideWinder as a channel for receiving the results of the malware’s commands Background The Group-IB Threat Intelligence team’s monitoring of state-sponsored threat actors’ activity revealed some tools belonging to SideWinder that had not been described in the public domain before. In addition to detailing the functionality and techniques employed in SideWinder’s new tools, the report describes the phishing part of the group’s 2021 operations based on backup archives obtained by Group-IB. The archives contained several phishing projects designed to target government, military, and law agencies in South and East Asia, among which were fake websites imitating the Central Bank of Myanmar and more. Despite its long history, SideWinder continues to be one of the most active state-sponsored hacker groups that pose a threat to governments in the Asia-Pacific region. The techniques and tools described in this report are currently used by the group and therefore relevant. In This Report https://www.group-ib.com/resources/research-hub/sidewinder-apt/ Page 3 of 7 Timeline The Group-IB team was able to reconstruct an approximate timeline of SideWinder’s phishing operations. New tools Group-IB malware analysts revealed some tools used by SideWinder that were previously unstated in the public domain. YARA rules The new report contains YARA rules for hunting the group and a table with the group’s TTPs (Tactics, Techniques, and Procedures) mapped to the MITRE ATT&CK® matrix, providing all the information companies and organizations needed to update their security controls to detect SideWinder. Advanced protection against cyber threats Group-IB’s security ecosystem provides comprehensive protection for your IT infrastructure based on our unique cyber intelligence and deep analysis of attacks and incident response. Threat Intelligence Managed XDR Attack Surface Management https://www.group-ib.com/resources/research-hub/sidewinder-apt/ Page 4 of 7 Products Resources Relevant reports We see the full picture of the evolving cyber threat landscape thanks to unique tools for monitoring the infrastructure used by cybercriminals and data from battlefields: Trend Report Hi-Tech Crime Trends 2022/2023 Benefit from Group-IB’s flagship cybersecurity report and explore the current threat landscape trend https://www.group-ib.com/resources/research-hub/sidewinder-apt/ Page 5 of 7 Research Hub Success Stories Knowledge Hub Certificates Webinars Podcasts TOP Investigations Ransomware Notes AI Cybersecurity Hub Threat Intelligence Fraud Protection Managed XDR Attack Surface Management Digital Risk Protection Business Email Protection Cyber Fraud Intelligence Platform Unified Risk Platform Integrations Partners Partner Program MSSP and MDR Partner Program Technology Partners Partner Locator Company About Group-IB Team CERT-GIB Careers Internship Academic Aliance Sustainability Media Center Contact APAC: +65 3159 3798 EU & NA: +31 20 226 90 90 Subscription plans Services Resource Center Subscribe to stay up to date with the latest cyber threat trends Contact https://www.group-ib.com/resources/research-hub/sidewinder-apt/ Page 6 of 7 MEA: +971 4 568 1785 info@group-ib.com © 2003 – 2026 Group-IB is a global leader in the fight against cybercrime, protecting customers around the world by preventing breaches, eliminating fraud and protecting brands. Terms of Use Cookie Policy Privacy Policy https://www.group-ib.com/resources/research-hub/sidewinder-apt/ Page 7 of 7