Latest cybersecurity reporting from selected sources.

The Russian hacking group known as Gamaredon has been attributed to the continued exploitation of a WinRAR vulnerability to deliver multiple malware families aimed at data theft and propagation

Russia-linked hacking group Fancy Bear is exploiting a brand-new vulnerability in Microsoft Office, CERT-UA says

Chinese Hackers Target European Diplomats with LNK File FlawChinese nation-state hackers are exploiting a Windows vulnerability to hack European diplomatic outposts, say security researchers - but operating system giant Microsoft says the flaw doesn't merit a patch. Hackers used a flaw already compromised by North Korea and Russia.

RomCom Group Deployed SnipBot, RustyClaw and Mythic Agent VariantsA Russian speaking hacking group is exploiting a zero-day flaw in WinRAR, a sign of the group's growing sophistication and evolution from a cybercrime outfit into a cyberespionage operation. The campaign exploited a vulnerability now tracked as CVE-2025-8088, a path traversal vulnerability.

Researchers have released a report detailing how a recent WinRAR path traversal vulnerability tracked as CVE-2025-8088 was exploited in zero-day attacks by the Russian 'RomCom' hacking group to drop different malware payloads. [...]

Dutch Servers Restored Following Moscow Led AttackThe Dutch Public Prosecution Service on Monday began phased restoration of its networks after a cyberattack last month forced the agency to take down its services offline. The agency confirmed that hackers exploited a vulnerability in a Citrix device.

Also: CISA Warns of Unpatched Train Brake VulnerabilityThis week: Louis Vuitton and Co-op confirm breaches, unpatched train brake flaw, Barclays fined £42M pounds for financial crime failures, secret U.K. program relocated thousands of Afghans, ex-soldier pleads guilty to hacking, Ukrainian hackers claim hit on Russian drone supplier.

A Russia-linked threat actor has been attributed to a cyber espionage operation targeting webmail servers such as Roundcube, Horde, MDaemon, and Zimbra via cross-site scripting (XSS) vulnerabilities, including a then-zero-day in MDaemon, according to new findings from ESET

The threat actors behind the zero-day exploitation of a recently-patched security vulnerability in Microsoft Windows have been found to deliver two new backdoors called SilentPrism and DarkWisp

At least 11 state-backed hacking groups from North Korea, Iran, Russia, and China have been exploiting a new Windows vulnerability in data theft and cyber espionage zero-day attacks since 2017. [...]

ESET Discovers Two Major Vulnerabilities Exploited by Russian RomCom Hacking GroupTwo vulnerabilities in Mozilla products and Windows are actively exploited by RomCom, a Kremlin-linked cybercriminal group known for targeting businesses and conducting espionage, warn security researchers from Eset. Exploiting the two flaws together enables attackers to execute arbitrary code.

Also: Critical WHOIS Vulnerability Exposes Internet Security Flaw in .mobi DomainsThis week, cyberthreats rising in Mexico; FBI warned of BEC scams; U.K. police arrested hacking suspect; Avis, Slim CD, Medicare and Fortinet disclosed breaches; Highline public schools reopened after cyberattack; a critical flaw was found in WHOIS; and Konni upped attacks on Russia, South Korea.

​Microsoft warns that the Russian APT28 threat group exploits a Windows Print Spooler vulnerability to escalate privileges and steal credentials and data using a previously unknown hacking tool called GooseEgg. [...]

​Microsoft warns that the Russian APT28 threat group exploits a Windows Print Spooler vulnerability to escalate privileges and steal credentials and data using a previously unknown hacking tool called GooseEgg. [...]

In January 2024, Microsoft discovered they’d been the victim of a hack orchestrated by Russian-state hackers Midnight Blizzard (sometimes known as Nobelium). The concerning detail about this case is how easy it was to breach the software giant. It wasn’t a highly technical hack that exploited a zero-day vulnerability – the hackers used a simple password spray attack to take control of

APT28 Used Hacked Ubiquiti Routers for Hashed Password Relay AttacksA campaign by Russian military intelligence to convert Ubiquiti routers into a platform for a global cyberespionage operation began as early as 2022, U.S. and foreign intelligence agencies said. The U.S. disrupted a botnet built by a hacking unit of Russian military's Main Intelligence Directorate.

TA422 Is Targeting Organizations in Europe and North America, Proofpoint SaysA Russian military hacking intelligence group is winning the race to exploit known vulnerabilities before system administrators can apply patches, warns Proofpoint. The firm has seen a spike in activity from TA422, also known as APT28, Fancy Bear and Forest Blizzard.

Google says that several state-backed hacking groups have joined ongoing attacks exploiting a high-severity vulnerability in WinRAR, a compression software used by over 500 million users, aiming to gain arbitrary code execution on targets' systems. [...]

Pro-Russian hacking groups have exploited a recently disclosed security vulnerability in the WinRAR archiving utility as part of a phishing campaign designed to harvest credentials from compromised systems

A Russian hacking group tracked as TA473, aka 'Winter Vivern,' has been actively exploiting vulnerabilities in unpatched Zimbra endpoints since February 2023 to steal the emails of NATO officials, governments, military personnel, and diplomats. [...]