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Group-IB reported renewed activity by APT SideWinder, describing a sustained cyber-espionage campaign aimed at government, military, and maritime organizations across Asia. The operation was characterized by targeted intrusion activity and a recognizable tradecraft pattern that researchers said allowed them to track the actor across multiple incidents.
The report said SideWinder continued to rely on spearphishing and malware delivery techniques tailored to regional targets, reinforcing the group’s role as a persistent intelligence threat rather than a financially motivated actor. Group-IB’s findings highlight SideWinder’s ongoing focus on sensitive institutions and critical sectors, with the campaign showing consistent operational behavior that supports attribution and threat hunting efforts.
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1 event from the most recent confirmed update back to the earliest known activity.
Group-IB published a blog post titled "The distinctive rattle of APT SideWinder," indicating public release of analysis related to the SideWinder threat actor. No additional incident dates or discrete events are provided in the reference content.
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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
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.
Jul 12, 2026
Researchers reported that **SideWinder** ran a five-month credential-harvesting campaign against South Asian military, government, telecommunications, and defense-sector organizations by abusing legitimate PaaS infrastructure instead of traditional attacker-controlled hosting. The operation used about **20 infrastructure nodes** across **Zeabur, Leapcell, Railway, Cloudflare Workers, Replit, Back4App**, and URL shorteners including **short.gy** and **tinyurl.cx**, with many phishing assets hosted on free-tier subdomains that could be quickly rebuilt after takedowns. Breakglass Intelligence linked the activity with high confidence to SideWinder based on targeting, Zimbra-themed phishing tradecraft, lure themes, and overlap with prior operations. The campaign targeted entities in **Pakistan** and **Bangladesh**, including **Margalla Heavy Industries Limited**, **Bangladesh Navy**, **Pakistan Air Force**, **Nayatel**, **Bangladesh Computer Council**, **NTC Pakistan**, and an unidentified international relations organization. Investigators said the attackers used a five-stage phishing chain with cloned **Zimbra** login pages that stole the same victim’s password twice, and they decoded a victim address, `pgcoord-251@margallahil[.]com`, from a phishing URL tied to Margalla Heavy Industries. A reused query parameter appeared across all phishing URLs for five months, giving defenders a potential detection signature, while **two Zeabur-hosted phishing sites remained active** and harvesting credentials at the time of reporting.
Jun 29, 2026