Mapping the Invisible Enemy: Sidewinder (APT-04) Indian-Linked Cyber Threat Infrastructure
In the modern threat landscape, advanced persistent threats (APTs) operate like invisible war machines, strategic, highly coordinated, and capable of maintaining long-term access to their targets.
Mapping Sidewinder (APT-04) Indian-Linked Cyber Threat Infrastructure
In the modern threat landscape, advanced persistent threats (APTs) operate like invisible war machines, strategic, highly coordinated, and capable of maintaining long-term access to their targets. One of the most persistent and regionally aggressive APTs is Sidewinder (APT‑04), widely attributed to state-linked actors operating from India.
Known for targeting government, military, energy, and telecom sectors, particularly across South and Southeast Asia, Sidewinder leverages a complex and layered infrastructure to execute its campaigns. Their operations rely heavily on modular malware loaders, overlapping C2 domains, and phishing infrastructure designed to impersonate government or military entities.
Understanding the Sidewinder Infrastructure
Sidewinder’s digital footprint is highly dynamic and deliberately obfuscated. Over the past few years, the group has evolved its malware delivery systems using techniques such as:
- Rotating domain names and IPs hosted on bulletproof VPS providers
- Hosting payloads behind decoy government-themed URLs
- Using weaponized Microsoft Office documents exploiting known CVEs
- Layered Command-and-Control (C2) servers, often operating through CDN fronting or subdomain hijacking
This infrastructure allows Sidewinder to shift attack vectors quickly, evade detection, and maintain persistent surveillance on high-value targets.
Indicators of Compromise (IOCs) – Block Immediately
| IOC Type | Value / Description |
|---|---|
| Filenames | CRC.docx, Briefing on Ongoing Projects.docx (decoy documents used during phishing) |
| File Hashes | e9726519487ba9e4e5589a8a5ec2f933 d36a67468d01c4cb789cd6794fb8bc70 313f9bbe6dac3edc09fe9ac081950673 |
| Additional DOCX hashes | a694ccdb82b061c26c35f612d68ed1c2 f42ba43f7328cbc9ce85b2482809ff1c |
| Malicious Domains | Numerous fake domains used for payload download, e.g. modpak‑info.services, pmd‑office.info |
| C2 Infrastructure | URLs hosting final-stage payloads: e.g., mailmofagovmm.mofa.email/hybridwarfare-866394/file.rtf |
Blocking these indicators at your firewall, endpoint, and DNS layers can significantly reduce risk exposure.
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