Microsoft posted this yesterday, if you missed it:

Microsoft: Cookie-controlled PHP webshells: A stealthy tradecraft in Linux hosting environments https://www.microsoft.com/en-us/security/blog/2026/04/02/cookie-controlled-php-webshells-tradecraft-linux-hosting-environments/ #infosec #Linux #Microsoft #threatresearch

Cookie-controlled PHP webshells: A stealthy tradecraft in Linux hosting environments | Microsoft Security Blog

Cookie-gated PHP webshells use obfuscation, php-fpm execution, and cron-based persistence to evade detection in Linux hosting environments. This post examines how this tradecraft conceals execution behind specially crafted HTTP cookies.

Microsoft Security Blog

New.

WatchTower: You’re Not Supposed To ShareFile With Everyone (Progress ShareFile Pre-Auth RCE Chain CVE-2026-2699 & CVE-2026-2701) https://labs.watchtowr.com/youre-not-supposed-to-sharefile-with-everyone-progress-sharefile-pre-auth-rce-chain-cve-2026-2699-cve-2026-2701/

Recorded Future: Latin America and the Caribbean Cybercrime Landscape https://www.recordedfuture.com/research/latin-america-and-the-caribbean-cybercrime-landscape

Mandiant: vSphere and BRICKSTORM Malware: A Defender's Guide https://cloud.google.com/blog/topics/threat-intelligence/vsphere-brickstorm-defender-guide

Cisco: UAT-10608: Inside a large-scale automated credential harvesting operation targeting web applications https://blog.talosintelligence.com/uat-10608-inside-a-large-scale-automated-credential-harvesting-operation-targeting-web-applications/

Threat Fabric: The Malware Gap: Why Fraud & Security Controls Still Miss Mobile Malware https://www.threatfabric.com/blogs/the-malware-gap-why-fraud-security-controls-still-miss-mobile-malware

Abnormal Security: Meet VENOM: The PhaaS Platform That Neutralizes MFA https://abnormal.ai/blog/venom-phishing-campaign-mfa-credential-theft

From yesterday:

Zscaler: Anthropic Claude Code Leak https://www.zscaler.com/blogs/security-research/anthropic-claude-code-leak #infosec #threatresearch #vulnerability #malware #threatintel #threatintelligence

You’re Not Supposed To ShareFile With Everyone (Progress ShareFile Pre-Auth RCE Chain CVE-2026-2699 & CVE-2026-2701)

If you squint and look at the CISA KEV list, you might think it's made up exclusively of vulnerabilities in file transfer solutions. While this would be wrong (and you shouldn’t squint, it’s bad for your eyes), file transfer solutions do play a decent role in the CISA

watchTowr Labs

I thought I saw this yesterday. 🤔

Halcyon: How One Letter Hid a Ransomware Army https://www.halcyon.ai/blog/how-one-letter-hid-a-ransomware-army-qilin

More:

Infosecurity-Magazine: Researchers Observe Sub-One-Hour Ransomware Attacks https://www.infosecurity-magazine.com/news/researchers-subonehour-ransomware/ #infosec #ransomware #threatresearch #cybercrime

How One Letter Hid a Ransomware Army

Qilin ransomware bypassed Windows Defender and Carbon Black EDR using a one-letter filename trick. It spread to 30 endpoints before Halcyon stopped it cold. Zero encryption.

Varonis, posted yesterday: A Quiet "Storm": Infostealer Hijacks Sessions, Decrypts Server-Side https://www.varonis.com/blog/storm-infostealer

More:

Infosecurity-Magazine: New 'Storm' Infostealer Remotely Decrypts Stolen Credentials https://www.infosecurity-magazine.com/news/storm-infostealer-remotely/ #infosec #threatresearch

A Quiet "Storm": Infostealer Hijacks Sessions, Decrypts Server-Side

Meet Storm, a new infostealer that tiptoes around endpoint security tools, remotely decrypts browser credentials, and lets operators restore hijacked sessions.

New.

Group-IB: Hooking the Archipelago: Dissecting a Phishing Campaign Targeting Philippine Banking Users https://www.group-ib.com/blog/phisles-phishing-banks-philippines/

Any.Run: Major Cyber Attacks in March 2026: OAuth Phishing, SVG Smuggling, Magecart, and More https://any.run/cybersecurity-blog/major-cyber-attacks-march-2026/ @anyrun_app

Kaspersky: A laughing RAT: CrystalX combines spyware, stealer, and prankware features https://securelist.com/crystalx-rat-with-prankware-features/119283/

Halcyon: How One Letter Hid a Ransomware Army https://www.halcyon.ai/blog/how-one-letter-hid-a-ransomware-army-qilin #threatresearch #ransomware #infosec #phishing #scam #spyware #malware

New.

AhnLab: A malicious LNK that spreads a Python-based backdoor and how it’s spreading (Kimsuky group) https://asec.ahnlab.com/en/93151/ #infosec #threatresearch #Python #malware

Malicious LNK Files Distributing a Python-Based Backdoor and Changes in Distribution Techniques (Kimsuky Group) - ASEC

Malicious LNK Files Distributing a Python-Based Backdoor and Changes in Distribution Techniques (Kimsuky Group) ASEC

ASEC

New.

Proofpoint: I’d come running back to EU again: TA416 resumes European government espionage campaigns https://www.proofpoint.com/us/blog/threat-insight/id-come-running-back-eu-again-ta416-resumes-european-government-espionage

More:

Infosecurity-Magazine: Chinese Threat Actors Target European Governments in Espionage Campaigns https://www.infosecurity-magazine.com/news/china-hackers-ta416-europe/ #infosec #threatresearch #espionage

I’d come running back to EU again: TA416 resumes European government espionage campaigns | Proofpoint US

Key findings From mid-2025 onwards, the China-aligned threat actor TA416 resumed observed targeting of European government and diplomatic organizations following a period of reduced EU-

Proofpoint

BlueVoyant, from yesterday: Unpacking Augmented Marauder’s Multi-Pronged Casbaneiro Campaigns https://www.bluevoyant.com/blog/augmented-marauders-multi-pronged-casbaneiro-campaigns

More:

The Hacker News: Casbaneiro Phishing Targets Latin America and Europe Using Dynamic PDF Lures https://thehackernews.com/2026/04/casbaneiro-phishing-targets-latin.html @thehackernews #infosec #malware #threatresearch

Augmented Marauder’s Multi-Pronged Casbaneiro Campaigns

BlueVoyant's Security Operations Center (SOC) reviews Augmented Marauder's multi-pronged phishing campaigns delivering the Casbaneiro banking trojan…

BlueVoyant
Operation TrueChaos: 0-Day Exploitation Against Southeast Asian Government Targets - Check Point Research

Key Points Introduction At the beginning of 2026, Check Point Research observed a series of targeted attacks against government entities in Southeast Asia carried out via a legitimate TrueConf software installed in the targets’ environment. The investigation led to the discovery of a zero-day vulnerability in the TrueConf client, tracked as CVE-2026-3502 with a CVSS score of 7.8. […]

Check Point Research

New.

Any.Run: Release Notes: Cross-Platform Threat Analysis with macOS, SSL Decryption, and 1,300+ New Detections https://any.run/cybersecurity-blog/release-notes-march-2026/ @anyrun_app #infosec #threatresearch #Apple #macOS

Release Notes: SSL Decryption, macOS, Windows Server & 1300+ New Detecions

March updates in ANY.RUN bring stronger phishing detection, broader sandbox coverage with macOS and Windows Server, new detections, and fresh TI reports.

ANY.RUN's Cybersecurity Blog