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Category — ReliaQuest
New Threat Cluster OP-512 Targets Microsoft IIS Servers with Custom Web Shell Framework

New Threat Cluster OP-512 Targets Microsoft IIS Servers with Custom Web Shell Framework

Jun 05, 2026 Cyber Espionage / Threat Intelligence
Cybersecurity researchers have discovered a previously unreported threat cluster dubbed OP-512 (where "OP" stands for "opponent") that has been observed targeting Microsoft Internet Information Services (IIS) servers to deploy a bespoke web shell framework. ReliaQuest has assessed with moderate to high confidence that the espionage-focused activity is linked to China. "OP-512 was highly likely conducting espionage through a compromised Internet Information Services (IIS) web server on an organization whose sector and geography align with China-linked intelligence priorities," the company said in a report shared with The Hacker News. Although no overlaps have been found between OP-512 and other known China-aligned adversaries, it's the fourth such threat group after CL-STA-0048 , DragonRank , and GhostRedirector to single out IIS web servers over the past 12 months. As recently as last month, Cisco Talos revealed that multiple Chinese-speaking...
Chinese Hackers Exploit ArcGIS Server as Backdoor for Over a Year

Chinese Hackers Exploit ArcGIS Server as Backdoor for Over a Year

Oct 14, 2025 Cyber Espionage / Network Security
Threat actors with ties to China have been attributed to a novel campaign that compromised an ArcGIS system and turned it into a backdoor for more than a year. The activity, per ReliaQuest, is the handiwork of a Chinese state-sponsored hacking group called Flax Typhoon , which is also tracked as Ethereal Panda and RedJuliett. According to the U.S. government, it's assessed to be a publicly-traded, Beijing-based company known as Integrity Technology Group. "The group cleverly modified a geo-mapping application's Java server object extension (SOE) into a functioning web shell," the cybersecurity company said in a report shared with The Hacker News. "By gating access with a hardcoded key for exclusive control and embedding it in system backups, they achieved deep, long-term persistence that could survive a full system recovery." Flax Typhoon is known for living up to the "stealth" in its tradecraft by extensively incorporating living-off-the-l...
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