Emerging Threats

PHP2Shell: Critical RCE Vulnerabilities Affect a Large Majority of Web Servers

Artificial Intelligence, Emerging Threats, News, Vulnerabilities /

PHP2Shell: Critical RCE Vulnerabilities Affect a Large Majority of Web Servers 2026-10-22 at 15:18 By Karl Sigler On October 21st, two critical memory manipulation vulnerabilities were disclosed in a joint announcement by Wiz Research, Calif, OpenAI, and the PHP team. The two vulnerabilities, combined, are being called PHP2Shell. The vulnerabilities are in PHP Core, which […]

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Inside Wazza: A Newly Observed Device Code Phishing Kit Targeting Microsoft 365 Accounts

Emerging Threats, Microsoft Security /

Inside Wazza: A Newly Observed Device Code Phishing Kit Targeting Microsoft 365 Accounts 2026-10-20 at 18:26 By Cris Tomboc and Kevin Adriano LevelBlue SpiderLabs has been tracking multiple waves of Wazza, a newly observed multi-stage phishing kit that deploys device code phishing targeting Microsoft 365 accounts. In addition to recent reporting by The Hacker News, our analysis […]

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Filling the Well: Nightmare-Eclipse’s BigDiskBuster and the Defender Update That Never Lands

Emerging Threats, Microsoft Security /

Filling the Well: Nightmare-Eclipse’s BigDiskBuster and the Defender Update That Never Lands 2026-10-05 at 15:57 By Serhii Melnyk and Timmy Lister A new proof of concept called BigDiskBuster, published on GitHub on September 19, 2026, by the actor known as MSNightmare, shows that Defender doesn’t need to be disabled to stop receiving updates, it just […]

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TIKTOUK: Tracing a WordPress Credential Collection Toolkit

Emerging Threats /

TIKTOUK: Tracing a WordPress Credential Collection Toolkit 2026-10-01 at 15:41 By Maor Gabay TIKTOUK brings together WordPress probing, collection of exposed configuration data, recovery of encrypted email credentials, and JavaScript secret scanning. Its two Python components and Go-based Linux crawler turn website responses into structured results for a central hub: an HTTP service that distributes […]

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Citrix NetScaler CVE-2026-88771: Observed Exploitation Artifacts and Hunt Indicators

Emerging Threats, News, Vulnerabilities /

Citrix NetScaler CVE-2026-88771: Observed Exploitation Artifacts and Hunt Indicators 2026-09-30 at 23:34 By Sean Shirley With contributions from James Rodriguez, Gus Staminatos, and Timmy Lister. This article is an excerpt from LevelBlue SpiderLabs Blog View Original Source

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Citrix NetScaler Zero-Day Exploited Globally

Emerging Threats, News, Vulnerabilities /

Citrix NetScaler Zero-Day Exploited Globally 2026-09-29 at 18:41 By Karl Sigler On Sept 27, Citrix released patches for two critical vulnerabilities being exploited in the wild. Based on current information, we confirm there has been no exposure or impact to LevelBlue or our clients. CISA has already added these vulnerabilities to the Known Exploited Vulnerabilities […]

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File Acquisition May Be Recorded as “FileAccessed” in Microsoft 365 (“M365”)

email security, Emerging Threats /

File Acquisition May Be Recorded as “FileAccessed” in Microsoft 365 (“M365”) 2026-09-24 at 15:30 By A recent trend has emerged where threat actor groups (e.g., ShinyHunters, PEAR, HELIX, etc.) have been leveraging phishing and vishing techniques to gain access to M365 email accounts. Through identity and token abuse, these actors have then automated large-scale file […]

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One Patch Behind: Nightmare-Eclipse’s ShieldCrash and the Defender Bypass That Won’t Stay Fixed

Emerging Threats, Microsoft Security, Vulnerabilities /

One Patch Behind: Nightmare-Eclipse’s ShieldCrash and the Defender Bypass That Won’t Stay Fixed 2026-09-16 at 16:35 By Serhii Melnyk and Timmy Lister In our previous blog, we analyzed four proofs of concept (PoCs) from the leak persona Nightmare-Eclipse that targeted Kaspersky, Avast, NVIDIA, and CrowdStrike, respectively. This article is an excerpt from LevelBlue SpiderLabs Blog […]

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Expanding the Attack Surface: Analyzing Nightmare-Eclipse’s Latest PoCs

Emerging Threats, Vulnerabilities /

Expanding the Attack Surface: Analyzing Nightmare-Eclipse’s Latest PoCs 2026-09-09 at 15:37 By Serhii Melnyk and Timmy Lister In our previous blog, we explored a series of disclosures from the leak persona Nightmare-Eclipse that focused heavily on Microsoft’s ecosystem, including Windows Defender, Cloud Files, and core operating system functionality. This article is an excerpt from LevelBlue SpiderLabs […]

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Still Circling: Inside the Operator Behind Blind Eagle’s GitHub Loader

Emerging Threats, Vulnerabilities /

Still Circling: Inside the Operator Behind Blind Eagle’s GitHub Loader 2026-08-28 at 17:00 By Serhii Melnyk This is a collaborative follow-up to our original post, developed jointly with Emmanuel C., an independent security researcher not affiliated with LevelBlue, who contributed additional infrastructure and tooling findings based on an analysis of the same GitHub staging account. […]

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Cloud Sync Root RegistrationShieldBreak: Hunting Windows Defender Remediation Abuse and Cloud Files Hijacking

Emerging Threats, News /

Cloud Sync Root RegistrationShieldBreak: Hunting Windows Defender Remediation Abuse and Cloud Files Hijacking 2026-08-19 at 18:40 By Serhii Melnyk and Timmy Lister Following GreenPlasma, YellowKey and MiniPlasma, RoguePlanet and GreatXML, and LegacyHive, the Nightmare-Eclipse disclosure actor has published ShieldBreak — its latest Windows proof of concept (PoC) released shortly after Microsoft’s August 2026 Patch Tuesday. […]

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Beyond the Inbox: How BEC Leads to SSO Abuse

email security, Emerging Threats, Vulnerabilities /

Beyond the Inbox: How BEC Leads to SSO Abuse 2026-08-13 at 20:40 By Jamie Mamroe and Federico Cedolini For years, many business email compromise (BEC) investigations have followed a familiar playbook: an attacker phishes credentials, logs into the victim’s mailbox, establishes persistence with inbox rules, monitors communications, and waits for an opportunity to steal money […]

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The Infrastructure Relay: Inside Multi-Stage Phishing Redirection Chains

email security, Emerging Threats /

The Infrastructure Relay: Inside Multi-Stage Phishing Redirection Chains 2026-08-12 at 16:42 By Karla Agregado To stay ahead of evolving threats, LevelBlue utilizes a machine-learning-based URL scanner that constantly evaluates the digital landscape. We closely monitor VirusTotal for instances where LevelBlue acts as the sole detection layer — a crucial tactic for spotting new phishing campaigns […]

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Practical Cybersecurity for Small Water Utilities: 5 Steps to Reduce Operational Risk

Emerging Threats, News, Tips & Tricks /

Practical Cybersecurity for Small Water Utilities: 5 Steps to Reduce Operational Risk 2026-08-11 at 17:00 By Nolen Johnson Recent cyberattacks against U.S. water and wastewater systems delivered an important reminder: disrupting operational technology (OT) does not always require sophisticated malware or a previously unknown vulnerability. In the July 2026 activity, internet-facing programmable logic controllers (PLCs), […]

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Beyond ‘Fake Updates’: From Application Store-Themed Phishing to Large-Scale Distribution of ScreenConnect

Emerging Threats, Vulnerabilities /

Beyond ‘Fake Updates’: From Application Store-Themed Phishing to Large-Scale Distribution of ScreenConnect 2026-08-07 at 16:10 By King Orande and Cris Tomboc The LevelBlue OpsCTI Team recently identified a large-scale phishing campaign leveraging a new social engineering method to deploy unauthorized ConnectWise ScreenConnect clients. Rather than relying on conventional phishing pages, the campaign recreates convincing software […]

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Review of the July 2026 Cyberattacks Against U.S. Water and Wastewater Systems

Emerging Threats, News, Security Research /

Review of the July 2026 Cyberattacks Against U.S. Water and Wastewater Systems 2026-08-04 at 16:20 By Nikita Kazymirskyi In light of the water-sector activity described below, we’ve increased monitoring for related indicators of compromise across our client environments. Please contact your LevelBlue account team with questions specific to your environment. This article is an excerpt […]

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LevelBlue TTP Briefing Q2 2026: Stolen Identities Outpace Defenses

DFIR, Emerging Threats, Reports /

LevelBlue TTP Briefing Q2 2026: Stolen Identities Outpace Defenses 2026-07-23 at 17:00 By Explore the latest tactics, techniques, and procedures (TTPs) our incident response (IR) experts are actively facing in the quarterly TTP Briefing, a report built on frontline threat intelligence from our global incident response investigations across LevelBlue during Q2 2026. This article is […]

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LegacyHive: Nightmare-Eclipse’s Latest Zero-Day Drop with a Stripped PoC

Emerging Threats, Vulnerabilities /

LegacyHive: Nightmare-Eclipse’s Latest Zero-Day Drop with a Stripped PoC 2026-07-20 at 15:35 By Pauline Bolaños Vexed researcher Nightmare-Eclipse (aka Chaotic Eclipse, Dead Eclipse, and MSNightmare) released his ninth unpatched Windows vulnerability called LegacyHive. This latest bug drop is a Local Privilege Escalation (LPE) vulnerability affecting Windows User Profile, a component responsible for loading and unloading […]

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