The PolySwarm Blog

Regions Targeted: Israel
Related Families: HOLLOWGRAPH, Cavern Framework

Executive Summary

Industry researchers identified HOLLOWGRAPH, a newly discovered malware component that it attributes with high confidence to the Cavern backdoor framework. Rather than relying on traditional command-and-control (C2) infrastructure, HOLLOWGRAPH abuses the Microsoft Graph API to transform a compromised Microsoft 365 calendar into a covert communications channel for receiving commands and exfiltrating stolen data. The campaign appears highly targeted, with at least 12 identified victims, primarily Israeli organizations, and only a small subset actively communicating with attacker infrastructure, suggesting a disciplined espionage operation.

Verticals Targeted: Government, Telecommunications, Finance, Aerospace
Regions Targeted: North America, South America, Africa, Europe, Asia
Related Families: Diaoyu Loader, ShadowGuard, Cobalt Strike, VShell

Executive Summary

A sophisticated state-aligned cyberespionage operation attributed to TGR-STA-1030 (also tracked as UNC6619) has been discovered, operating from Asia. It has compromised government and critical infrastructure entities across 37 countries over the past year while conducting reconnaissance against government infrastructure in 155 countries. The group's “Shadow Campaigns” leverage phishing, N-day exploitations, and advanced tooling to prioritize intelligence collection on economic partnerships, trade, and diplomatic activities.

Verticals Targeted: Government, Academia
Regions Targeted: India
Related Families: None

Executive Summary

APT36, also known as Transparent Tribe, a Pakistan-aligned threat actor, has launched a targeted cyber espionage campaign against Indian governmental, academic, and strategic entities using sophisticated deception techniques. The operation delivers a multi-stage Remote Access Trojan (RAT) through a weaponized LNK file disguised as a PDF, enabling persistent access, surveillance, and data exfiltration with minimal detection risk. The campaign has targeted government, academic, and strategic entities in India.

Verticals Targeted: Not specified
Regions Targeted: Turkey, Israel, Azerbaijan
Related Families: Phoenix

Verticals Targeted: Government
Regions Targeted: Middle East, North Africa
Related Families: Phoenix, FakeUpdate

Executive Summary

A sophisticated phishing operation has been attributed to the Iran-linked APT MuddyWater, deploying an updated Phoenix backdoor to conduct espionage against government and international entities. The campaign leverages compromised mailboxes and macro-enabled Word documents to deliver custom injectors and persistence mechanisms, highlighting the group's reliance on trusted channels for initial access.

Verticals Targeted: Telecommunications
Regions Targeted: Europe
Related Families:  SNAPPYBEE (Deed RAT)

Executive Summary

Salt Typhoon, a China-linked advanced persistent threat (APT) group, has been targeting global critical infrastructure using sophisticated tactics like DLL sideloading and zero-day exploits. Recent activity targeted a European telecommunications entity.