China-Linked Fire Ant Compromises Cisco Routers to Steal Credentials

🚨 ACTIVE EXPLOITATION

• China-Linked Fire Ant Compromises Cisco Routers to Steal Credentials
  Fire Ant compromised Cisco routers and TACACS servers to steal credentials and hide activity.
  • The campaign targeted organizations using Cisco IOS XR routers, TACACS authentication servers, and Linux management hosts.
  • Fire Ant collected router traffic and administrative credentials while probing paths to connected high-value environments; confirmed compromise of those networks was not reported.
  • A GRE tunnel from a legacy Linux host pivoted into an edge router, while IOS XR malware filtered logs and command output to conceal activity.
  • TacTap injected /lib/libseconfd.so into tac_plus; credentials were stored in /var/log/.tacplus.acct and obfuscated with XOR key 0xEF.
  • BridgeAgent persisted through zabbix_agent.service and used TLS on port 443; other implants included /usr/bin/acpid (SHA1 be6b27f429324a4af05a310d8ec9635e37c68a94) and /var/tmp/ping (SHA1 5ba1242050b5b447052b210788a5a25593d6987d).
  Sources 📄 Source: sygnia.co · 📎 Coverage: thehackernews.com · 👁 via The Hacker News

🕵️ RESEARCH & DEEP DIVES

• Spring Ring Uses Microsoft Teams Voice Phishing to Deploy Malware
  Spring Ring uses Microsoft Teams voice phishing to deploy malware.

  • The campaign targets enterprises using Microsoft Teams.
  • Attackers deploy malware and target enterprise domain controllers.
  • The attack abuses Microsoft Teams and voice phishing.
  Sources 📄 Source: unit42.paloaltonetworks.com · 📎 Coverage: radar.offseq.com · 👁 via Palo Alto Unit 42

• ValleyRAT Backdoor Masquerades as QN Wallpaper Adware in Asia
  Kaspersky has identified a ValleyRAT campaign disguised as QN Wallpaper adware.

  • Users and organizations in Asia, especially India and China, are targeted.
  • ValleyRAT steals keystrokes and clipboard data, captures screenshots, and delivers additional modules.
  • A trojanized QN Wallpaper installer uses DLL sideloading to launch the backdoor.
  • The payload runs under a process signed with a legitimate developer certificate.
  • Kaspersky detected related ValleyRAT malware more than 100,000 times on devices belonging to over 1,500 users in 2026.
  Sources 📄 Source: securelist.com · 📎 Coverage: lankabusinessnews.com · 👁 via Securelist (Kaspersky)

• Gryxa AI-Assisted Malware Survives Cleanup and Targets Windows Credentials
  ReliaQuest identified Gryxa, an AI-assisted Windows malware toolkit.

  • A financially motivated actor used Gryxa across 324 listed Windows hosts, with 69 online during analysis.
  • Gryxa abuses legitimate RMM software for covert access and steals credentials from Chromium-based browsers and crypto wallets.
  • Phishing emails likely deliver a 19 MB invoice-themed executable matching invoice_before 10 digits>.exe, which downloads components over HTTPS.
  • At least seven scheduled tasks, permanent WMI persistence and backup files restore the toolkit after partial removal.
  • A surviving component sends Windows logs to the operator and may disable endpoint security after relay failures; IOCs include wirbe[.]com, gryxa[.]com, 144.172.107[.]56 and 209.145.55[.]189.
  Sources 📄 Source: reliaquest.com · 📎 Coverage: cybersecuritynews.com · 👁 via Cyber Security News, cryptika.com (discovered)

📋 ADVISORIES

• UK NCSC Cyber Assessment Framework reaches version 4.0
  The UK NCSC has released Cyber Assessment Framework version 4.0.

  • CAF 4.0 applies mainly to critical-sector organizations and essential-service suppliers.
  • It covers energy, healthcare, transportation, water, digital infrastructure, telecommunications and government.
  • The framework has four objectives, 14 principles and 41 contributing outcomes.
  • Released in August 2025, CAF 4.0 adds AI risks, threat hunting, monitoring and secure software development.
  • Organizations assess outcomes as Achieved, Partially Achieved, Not Achieved or Not Applicable.
  Sources 📎 Coverage: centraleyes.com · 👁 via securityboulevard.com (discovered)

• 📄 Source for Manchester Airports Group confirms data breach affecting 8.7 million customers — manchesterairport.co.uk

• 📄 Source for Rhysida Claims Berlin State Network Data Theft, Demands 30 Bitcoin — berlin.de

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