Latest cybersecurity reporting from selected sources.

Gamaredon exploits a WinRAR flaw to drop modular, nearly fileless malware on Ukrainian targets, hiding payloads in Windows streams and resolving C2s via Telegram. Sekoia’s Threat Detection & Research team dropped a YARA rule in late December 2025 to hunt for new initial access vectors, and by January 2026 it had already generated a dozen […]

Storm-2949 turned stolen credentials into a cloud-wide breach, moving from identity compromise to large-scale data theft without using malware. This incident shows how threat actors can exploit trusted systems to operate undetected. The post How Storm-2949 turned a compromised identity into a cloud-wide breach appeared first on Microsoft Security Blog.

Microsoft Incident Response investigated an attack operated through legitimate and trusted administrative mechanisms to blend seamlessly into routine operations and remain undetected demonstrating that intrusions have increasingly avoided using noisy exploits, obvious malware, or custom tooling, instead leveraging systems that organizations already trust within their environments. The post Undermining the trust boundary: Investigating a stealthy intrusion through third-party compromise appeared first on Microsoft Security Blog.

Exploit hasn't been picked up by any malware detection engines, CEO tells The Reg A Microsoft zero-day vulnerability that allows an unprivileged user to crash the Windows Remote Access Connection Manager (RasMan) service now has a free, unofficial patch - with no word as to when Redmond plans to release an official one - along with a working exploit circulating online.…

This week saw a lot of new cyber trouble. Hackers hit Fortinet and Chrome with new 0-day bugs. They also broke into supply chains and SaaS tools. Many hid inside trusted apps, browser alerts, and software updates

A recently patched security flaw in Microsoft Windows Server Update Services (WSUS) has been exploited by threat actors to distribute malware known as ShadowPad

MuddyWater Also Embraces Bulletproof Hosts and Custom MalwareThe Iranian nation-state cyberespionage group MuddyWater is going back to the future with attacks featuring Microsoft Office documents with malicious macros. It is also shifting to homegrown malware in place of commercial remote monitoring and management tools, said researchers.

Defrauding search with custom malware, Potato-family exploits A new China-aligned cybercrime crew named GhostRedirector has compromised at least 65 Windows servers worldwide - spotted in a June internet scan - using previously undocumented malware to juice gambling sites' rankings in Google search, according to ESET researchers.…

The threat actor known as Silver Fox has been attributed to abuse of a previously unknown vulnerable driver associated with WatchDog Anti-malware as part of a Bring Your Own Vulnerable Driver (BYOVD) attack aimed at disarming security solutions installed on compromised hosts

The threat actor known as EncryptHub is continuing to exploit a now-patched security flaw impacting Microsoft Windows to deliver malicious payloads

Brazil-Targeting Malware Exploits Windows UIA to Evade DetectionA banking Trojan long confined to Brazil has become the first known malware to exploit Microsoft's UI Automation framework to extract credentials, signaling a new tactic that may evade conventional detection. Akamai's findings point to a growing trend of attackers using legitimate system features.

The Windows banking trojan known as Coyote has become the first known malware strain to exploit the Windows accessibility framework called UI Automation (UIA) to harvest sensitive information

Cybersecurity researchers have uncovered a Go-based malware called XDigo that has been used in attacks targeting Eastern European governmental entities in March 2025

A threat actor known as Hazy Hawk has been observed hijacking abandoned cloud resources of high-profile organizations, including Amazon S3 buckets and Microsoft Azure endpoints, by leveraging misconfigurations in the Domain Name System (DNS) records

Attackers aren’t waiting for patches anymore — they are breaking in before defenses are ready. Trusted security tools are being hijacked to deliver malware. Even after a breach is detected and patched, some attackers stay hidden

Microsoft today released updates to plug at least 121 security holes in its Windows operating systems and software, including one vulnerability that is already being exploited in the wild. Eleven of those flaws earned Microsoft's most-dire "critical" rating, meaning malware or malcontents could exploit them with little to no interaction from Windows users.

Hackers have long used Word and Excel documents as delivery vehicles for malware, and in 2025, these tricks are far from outdated. From phishing schemes to zero-click exploits, malicious Office files are still one of the easiest ways into a victim’s system

The threat actor known as EncryptHub exploited a recently-patched security vulnerability in Microsoft Windows as a zero-day to deliver a wide range of malware families, including backdoors and information stealers such as Rhadamanthys and StealC

Also: France Temporarily Lifts Pavel Durov's Travel Ban Amid Telegram ProbeThis week, Paragon Solutions spread through WhatsApp, France suspended Pavel Durov's travel ban, Vapor malware hit 60M Android users, state-backed hackers exploit a Windows flaw, Western Alliance Bank exposed customers data, Apple fixed a passwords bug, and a sperm bank exposed customer information.

Phishing attack exploits social engineering techniques alongside Microsoft Teams and remote access software to deploy BackConnect malware