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GreyNoise announced C2 Detection, a new intelligence module that identifies compromised edge and perimeter devices (routers, firewalls, VPN concentrators) from their outbound connections to attacker-controlled infrastructure. The capability extends GreyNoise beyond inbound scanning intelligence into post-exploitation, outbound-facing dete…
Objective-See analyzed Heartbreaker, a previously unknown macOS ransomware sample (ad hoc-signed ARM64 Mach-O written in Rust). It was uploaded to VirusTotal in May 2025 and remains undetected by all AV engines. It was found by researcher Megan Carney. It encrypts files in ~/Downloads with AES-256-GCM, renames them to .heartbreaker, drops…
Attackers began exploiting Plex2Shell, a chain of four Plex Media Server vulnerabilities, within about a day of researcher Zach Main publishing technical details and PoC code on October 16, 2026. A researcher running an internet-facing honeypot observed the first in-the-wild exploitation on October 17. The attackers deployed an XMRig-base…
Between March 12 and 18, 2026, the GreyNoise Observation Grid (GOG) recorded 242,666 new scanning IPs geolocating to Hong Kong, 48.9% of all new scanning IPs seen that week. 99.7% never completed a TCP handshake, so GreyNoise classes them as "spoofable" (unverified source addresses). They carried no payloads and triggered no signatures. G…
F5 Labs, with Efflux sensor telemetry, profiled a persistent information-disclosure scanner operating from 78.153.140.203 in a netblock of AS202306 (HOSTGLOBAL.PLUS LTD), a UK ISP. The IP was first seen on 10 January 2025, vanished on 10 April, and returned on 11 July 2025. It scans 130 unique URLs: 80.23% are variations of /.env, 11.45% …
Huntress researchers detailed an SEO-poisoning campaign on 13 October that harvests SSL VPN credentials through a lookalike WatchGuard download page, watchguard-vpn.net, and then delivers the legitimate, validly signed Mobile VPN with SSL installer. Earlier waves used trojanised installers, but this iteration contains no malware, so endpo…
Unit 42 attributes with high confidence to an Iranian state-aligned actor, tracked as CL-STA-1178, a campaign called Blinder Tunnel. In March 2026 it targeted an individual in Iraq's critical infrastructure sector, after infrastructure staging that began as early as November 2025. The actor impersonated the Dubai Airports IT department an…
