Incident Score: Analysis & Impact (CIS1788172042)
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Rankiteo Score Impact Analysis
Key Highlights From The Incident Analysis
- Timeline of Cisco's Cyber Attack and lateral movement inside company's environment.
- Overview of affected data sets, including SSNs and PHI, and why they materially increase incident severity.
- How Rankiteo’s incident engine converts technical details into a normalized incident score.
- How this cyber incident impacts Cisco Rankiteo cyber scoring and cyber rating.
- Rankiteo’s MITRE ATT&CK correlation analysis for this incident, with associated confidence level.
Full Incident Analysis Transcript
In this Rankiteo incident briefing, we review the Cisco breach identified under incident ID CIS1788172042.
The analysis begins with a detailed overview of Cisco's information like the linkedin page: https://www.linkedin.com/company/cisco, the number of followers: 7652581, the industry type: Software Development and the number of employees: 95930 employees
After the initial compromise, the video explains how Rankiteo's incident engine converts technical details into a normalized incident score. The incident score before the incident was 461 and after the incident was 453 with a difference of -8 which is could be a good indicator of the severity and impact of the incident.
In the next step of the video, we will analyze in more details the incident and the impact it had on Cisco and their customers.
A newly reported cybersecurity incident, "Fire Ant Expands Cyber Espionage Campaign to Cisco Routers and TACACS Servers", has drawn attention.
A China-linked cyber espionage group tracked as Fire Ant has broadened its long-running campaign, shifting from VMware hypervisors to target Cisco IOS XR routers, TACACS servers, and Linux management hosts in high-value networks.
The disruption is felt across the environment, affecting Cisco IOS XR routers, TACACS servers and Linux management hosts, and exposing Network traffic, Credentials and Packet data (PCAPs).
In response, moved swiftly to contain the threat with measures like Cross-validation of logs with memory, disk, and network evidence and Treatment of routers, TACACS servers, and hypervisors as critical forensic assets.
The case underscores how Ongoing, teams are taking away lessons such as Routers, TACACS servers, and hypervisors should be treated as critical forensic assets. Cross-validation of logs with memory, disk, and network evidence is essential to detect sophisticated threats, and recommending next steps like Treat routers, TACACS servers, and hypervisors as critical forensic assets, Cross-validate logs with memory, disk, and network evidence and Monitor for unusual GRE tunnels or unconfigured network changes.
Finally, we try to match the incident with the MITRE ATT&CK framework to see if there is any correlation between the incident and the MITRE ATT&CK framework.
The MITRE ATT&CK framework is a knowledge base of techniques and sub-techniques that are used to describe the tactics and procedures of cyber adversaries. It is a powerful tool for understanding the threat landscape and for developing effective defense strategies.
MITRE ATT&CK® Correlation Analysis
Rankiteo's analysis has identified several MITRE ATT&CK tactics and techniques associated with this incident, each with varying levels of confidence based on available evidence. Under the Initial Access tactic, the analysis identified Exploit Public-Facing Application (T1190) with moderate to high confidence (80%), with evidence including exploitation of Cisco IOS XR routers, and target Cisco IOS XR routers, TACACS servers and Valid Accounts (T1078) with moderate to high confidence (70%), with evidence including harvest credentials, and tacTap intercepted live session handles. Under the Execution tactic, the analysis identified Command and Scripting Interpreter (T1059) with high confidence (90%), with evidence including altered command execution paths, and custom SSH backdoors and System Services: Service Execution (T1569.002) with moderate to high confidence (80%), supported by evidence indicating bridgeAgent persisting via systemd service. Under the Persistence tactic, the analysis identified Create or Modify System Process: Systemd Service (T1543.002) with high confidence (90%), supported by evidence indicating bridgeAgent persisting via zabbix_agent.service, Boot or Logon Autostart Execution: Kernel Modules and Extensions (T1547.006) with moderate to high confidence (80%), supported by evidence indicating medusa rootkit, REPTILE rootkit deployed, and Event Triggered Execution: Accessibility Features (T1546.008) with moderate to high confidence (70%), supported by evidence indicating packet-triggered backdoor activated by specific TCP/UDP ports. Under the Privilege Escalation tactic, the analysis identified Abuse Elevation Control Mechanism: Setuid and Setgid (T1548.001) with moderate to high confidence (70%), supported by evidence indicating custom malware tailored for IOS XR, rootkits deployed and Exploitation for Privilege Escalation (T1068) with moderate to high confidence (80%), supported by evidence indicating exploitation of Cisco IOS XR routers, TACACS servers. Under the Defense Evasion tactic, the analysis identified Indicator Removal: Clear Linux or Mac System Logs (T1070.001) with high confidence (90%), supported by evidence indicating suppressing router logs, SNMP traps, authentication requests, Impair Defenses: Disable or Modify Tools (T1562.001) with high confidence (90%), supported by evidence indicating disabling SELinux, altering login histories, Masquerading: Match Legitimate Name or Location (T1036.005) with moderate to high confidence (80%), supported by evidence indicating bridgeAgent disguised as Zabbix monitoring agent, Hide Artifacts: Hidden Files and Directories (T1564.001) with moderate to high confidence (80%), supported by evidence indicating credentials written to /var/log/.tacplus.acct, and Obfuscated Files or Information: Software Packing (T1027.002) with moderate to high confidence (70%), supported by evidence indicating single-byte XOR obfuscation (0xEF) for credentials. Under the Credential Access tactic, the analysis identified OS Credential Dumping: /etc/passwd and /etc/shadow (T1003.008) with moderate to high confidence (80%), supported by evidence indicating tacTap intercepted live session handles on TACACS servers, Adversary-in-the-Middle: LLMNR/NBT-NS Poisoning and SMB Relay (T1557.001) with moderate to high confidence (70%), supported by evidence indicating captured packet data (PCAPs) from multiple Cisco devices, and Modify Authentication Process: Pluggable Authentication Modules (T1556.003) with high confidence (90%), supported by evidence indicating tacTap injected malicious library into tac_plus process. Under the Discovery tactic, the analysis identified Network Service Discovery (T1046) with high confidence (90%), supported by evidence indicating port probing (SSH, HTTP, SMB, RDP) on legacy Linux system, File and Directory Discovery (T1083) with moderate to high confidence (80%), supported by evidence indicating scan and probe connected environments, critical infrastructure, and Remote System Discovery (T1018) with moderate to high confidence (80%), supported by evidence indicating connection attempts against administrative services. Under the Collection tactic, the analysis identified Data from Local System (T1005) with high confidence (90%), supported by evidence indicating captured packet data (PCAPs) from multiple Cisco devices and Automated Collection (T1119) with moderate to high confidence (80%), supported by evidence indicating compromised routers as collection platforms for network traffic. Under the Command and Control tactic, the analysis identified Application Layer Protocol: Web Protocols (T1071.001) with high confidence (90%), supported by evidence indicating bridgeAgent communicating over TLS on port 443, Encrypted Channel: Asymmetric Cryptography (T1573.002) with moderate to high confidence (80%), supported by evidence indicating bridgeAgent communicating over TLS on port 443, and Ingress Tool Transfer (T1105) with moderate to high confidence (70%), supported by evidence indicating custom malware tailored for IOS XR, rootkits deployed. Under the Exfiltration tactic, the analysis identified Exfiltration Over C2 Channel (T1041) with high confidence (90%), supported by evidence indicating pCAPs uploaded to external FTP servers set up the same day and Exfiltration Over Alternative Protocol: Exfiltration Over Unencrypted/Obfuscated Non-C2 Protocol (T1048.003) with moderate to high confidence (80%), supported by evidence indicating pCAPs uploaded to external FTP servers. Under the Lateral Movement tactic, the analysis identified Remote Services: SSH (T1021.004) with moderate to high confidence (80%), supported by evidence indicating port probing (SSH), connection attempts against administrative services and Lateral Tool Transfer (T1570) with moderate to high confidence (70%), supported by evidence indicating custom malware, rootkits deployed across routers, TACACS servers. These correlations help security teams understand the attack chain and develop appropriate defensive measures based on the observed tactics and techniques.
Sources & References
- Cisco Rankiteo Cyber Incident Details: https://www.rankiteo.com/company/cisco/incident/CIS1788172042
- Cisco CyberSecurity Rating page: https://www.rankiteo.com/company/cisco
- Cisco Rankiteo Cyber Incident Blog Article: https://blog.rankiteo.com/cis1788172042-cisco-cyber-attack-july-2025/
- Cisco CyberSecurity Score History: https://www.rankiteo.com/company/cisco/history
- Cisco CyberSecurity Incident Source: https://thehackernews.com/2026/08/china-linked-fire-ant-hijacks-cisco.html
- Rankiteo A.I CyberSecurity Rating methodology: https://www.rankiteo.com/Images/rankiteo_algo.pdf
- Rankiteo TPRM Scoring methodology: https://static.rankiteo.com/model/rankiteo_tprm_methodology.pdf