Author: CyberDudeBivash Powered by: CyberDudeBivash Brand | cyberdudebivash.com Related: cyberbivash.blogspot.com Daily Threat Intel by CyberDudeBivash Zero-days, exploit breakdowns, IOCs, detection rules & mitigation playbooks. Follow on LinkedIn Apps & Security Tools CYBERDUDEBIVASH CYBERDUDEBIVASH PVT LTD WWW.CYBERDUDEBIVASH.COM When Malware Stops Looking the Same Understanding Polymorphic Malware in 2026 & the CyberDudeBivash Countermeasure 5 January 2026 By Bivash Kumar Nayak Founder & Cybersecurity Strategist, CyberDudeBivash Pvt. Ltd. Introduction: The End of Static Malware For years, defenders relied on a simple assumption: malware looks the same every time it spreads. That assumption no longer holds. In 2026, modern malware families rarely reuse identical code. Instead, they continuously mutate their structure while preserving functionality — a technique broadly known as polymorphism . This evolutio...
Actively Exploited Zero-Days (2025): Who’s Affected and How to Block the Kill Chain By CyberDudeBivash • Date: September 20, 2025 (IST)
TL;DR — Patch-First Shortlist (with fast mitigations)
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Chrome V8 type confusion — CVE-2025-10585 (active): Update to 140.0.7339.185+ (desktop). Block risky extensions; enable strict site isolation; monitor for child-process crashes from Chrome. BleepingComputer+1
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Apple ImageIO — CVE-2025-43300 (exploited, targeted): Update iOS/iPadOS/macOS to the latest security release; enable Lockdown Mode for high-risk users; treat untrusted images as untrusted code. Apple Support+1
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Ivanti Connect Secure/Policy Secure — CVE-2025-0282 (zero-day carryover): Patch to fixed releases (22.7R2.5+ etc.), rotate creds, reimage if compromise suspected; assume token/session theft. NVD+1
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Windows CLFS kernel — CVE-2025-29824 (ransomware activity): Apply April updates; watch for LSASS access + driver load anomalies; EDR block on unsigned kernel access. Microsoft
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Windows Fast FAT — CVE-2025-24985 (exploited): Apply March updates; hunt for suspicious removable-media events and crafted FAT images. Tenable®
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Citrix NetScaler ADC/Gateway:
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Cisco ISE / ISE-PIC — CVE-2025-20281/-20282/-20337 (active): Patch; isolate mgmt plane; hunt for new admin users and odd process launches. The Hacker News+1
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WinRAR for Windows — CVE-2025-8088 (active, RomCom): Manually update to 7.13 (no auto-update); block
.rarfrom unknown senders; hunt for autorun file drops. WinRAR+2We Live Security+2 -
N-able N-central — CVE-2025-8876 (command injection, in KEV): Patch or isolate; assume RMM takeover if exposed; rotate API keys. CISA
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Dassault DELMIA Apriso — CVE-2025-5086 (deserialization, in KEV): Patch and remove public exposure; inspect for odd job executions. CISA
Kill-Chain Notes (how these are being weaponized)
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Initial Access: perimeter device bugs (Citrix NetScaler, Ivanti ICS) and user-space apps (Chrome, WinRAR) deliver code or leak tokens—often via spear-phish archives or web drive-bys. Google Cloud+2BleepingComputer+2
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Privilege & Lateral: kernel/CLFS elevation and device-management platforms (ISE/N-central) convert footholds into domain or network control. Microsoft+1
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Exfil/Impact: session theft (CitrixBleed-class) + webshells/RMM persistence → data theft, potential ransomware staging. CISA+1
“Who’s Affected” Quick Matrix
| CVE / Product | Typical Exposure | Likely Targets | First Moves (Blue Team) |
|---|---|---|---|
| CVE-2025-10585 Chrome V8 | User endpoints | Everyone using Chrome/Edge | Force browser update; isolate crashy hosts; enable site isolation. BleepingComputer |
| CVE-2025-43300 Apple ImageIO | Mobile/laptop | Execs, journalists, high-risk users | Update OS; Lockdown Mode; disable iMessage previews for VIPs. Apple Support |
| CVE-2025-0282 Ivanti ICS/PS | VPN perimeter | Enterprises w/ remote access | Patch; rotate creds; audit appliance for IOC scripts. Google Cloud |
| CVE-2025-29824 Windows CLFS | Servers/Endpoints | Ransomware targets | Patch; block unsigned drivers; hunt CLFS exploitation artifacts. Microsoft |
| CVE-2025-24985 Windows Fast FAT | Endpoints | Users handling removable media | Patch; restrict autorun; monitor mount events. Tenable® |
| CVE-2025-5777 / 7775 Citrix NetScaler | ADC/Gateway | Remote-access edge | Patch; revoke sessions; scan for webshells; restrict mgmt to VPN. CISA+1 |
| CVE-2025-20281+ Cisco ISE | NAC/IdP infra | Large enterprises | Patch; rotate admin creds; review TACACS/RADIUS logs. The Hacker News |
| CVE-2025-8088 WinRAR | User endpoints | Phish recipients | Update to 7.13; block .rar; hunt Startup-folder drops. WinRAR |
| CVE-2025-8876 N-able N-central | RMM | MSPs, IT ops | Patch; remove public access; rotate API keys. CISA |
| CVE-2025-5086 DELMIA Apriso | OT/Manufacturing | Industrial | Patch; remove internet exposure; validate serialized inputs. CISA |
Patch-Now Playbook (90-minute run)
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Edge devices first: NetScaler, Ivanti, Cisco ISE — patch, revoke sessions/tokens, rotate secrets, scan for webshells. CISA+2Google Cloud+2
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User apps: Force Chrome/Edge update; push WinRAR 7.13; block risky file types at mail gateway. BleepingComputer+1
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OS fixes: Roll April & March Windows updates for CLFS/FAT; enable kernel-attack telemetry. Microsoft+1
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Apple fleet: Ship latest iOS/iPadOS/macOS; enable Lockdown Mode for VIPs and threat-exposed teams. Apple Support
Detection cues
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Citrix session scraping (CVE-2025-5777): spikes of
/varreads + unusualnsconmsginvocations; sudden mass session invalidations. CISA -
WinRAR zero-day: creation of executables within
%APPDATA%\Microsoft\Windows\Start Menu\Programs\Startup\immediately after.rarextraction. We Live Security -
Chrome exploit attempts: renderer crashes followed by new process spawn chains to LOLBins (
mshta,rundll32). BleepingComputer -
CLFS abuse: unusual CLFS log operations preceding EDR-flagged credential theft or driver tampering. Microsoft
#CyberDudeBivash #ZeroDay #CVE #ExploitedInTheWild #PatchNow #Citrix #Ivanti #Chrome #WinRAR #CiscoISE #Microsoft #Apple #ThreatIntel #SOC #IR
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