SideWinder Phish Steals South Asian Webmail Logins

SideWinder, a notorious advanced persistent threat group, has intensified its operations in South Asia with a sophisticated phishing campaign. The group employs a fake Chrome PDF viewer and a replica of the Zimbra email portal to steal government webmail credentials—a tactic known as the SideWinder phish. This campaign has seen relentless targeting since February 2026, focusing on high-profile organizations such as the Bangladesh Navy and Pakistan’s Ministry of Foreign Affairs.

The phishing attacks start with a spearphishing link that leads victims to a mock Chrome PDF viewer. The PDF contains real but unreadable diplomatic information from Pakistan. Within moments, victims are steered toward a counterfeit Zimbra login page, meticulously designed to capture sensitive credentials. Given SideWinder’s high level of activity and precision, organizations need to rotate their login credentials and enhance vigilance. Security teams must stay alert to new Cloudflare Worker accounts deploying similar tactics.

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SideWinder Uses Fake Chrome PDF Viewer and Zimbra Clone to Steal Government Webmail Credentials