Static Tundra Targets Unpatched Cisco Network Devices in Long-Running Espionage Campaign
Summary
Talos reports that Russian state-sponsored group Static Tundra exploits unpatched Cisco devices, including through CVE-2018-0171, to steal configurations and maintain long-term access. It recommends patching the flaw or disabling Smart Install.
Key points
- Talos assesses Static Tundra is a Russian state-sponsored espionage group linked to the FSB’s Center 16 unit and likely related to Energetic Bear.
- The group targets unpatched, often end-of-life Cisco IOS and IOS XE devices, exploiting CVE-2018-0171 and sometimes using compromised or weak SNMP community strings.
- After gaining access, attackers retrieve device configurations that may expose credentials and SNMP strings, then pivot to other devices in target networks.
- Persistence methods include privileged local accounts, altered SNMP settings, modified access controls and logging, and the SYNful Knock firmware implant.
- Talos reports targeting across telecommunications, higher education and manufacturing, with victims in multiple regions and increased activity against Ukrainian organizations since the war began.
- The group has used GRE tunnels and NetFlow collection to capture network traffic and has exfiltrated device configurations through TFTP, FTP, and SNMP-related methods.
- Talos advises applying the CVE-2018-0171 patch or disabling Smart Install, replacing unsupported devices, and hardening and monitoring network-device access.
Article Details
- Attack Vectors
- Exploitation of CVE-2018-0171 in Cisco IOS and Cisco IOS XE Smart Install on unpatched network devices.
- SNMP access using compromised or guessed community strings, including the insecure strings "anonymous" and "public".
- Use of SNMP to modify device configurations, create local accounts, enable remote services, and retrieve configuration data.
- Defensive Notes
- Apply the patch for CVE-2018-0171; if patching is not possible, disable Smart Install as advised by Cisco.
- Replace or develop end-of-life management plans for devices that cannot be patched.
- Disable Telnet, use encrypted management protocols, and avoid default credentials and community strings.
- Monitor configuration changes, authentication and command activity, syslog and AAA logs, NetFlow, and unusual management-interface exposure.
- Use strong access controls, multi-factor authentication, network segmentation, and centralized configuration management.
Indicators of compromise
| Type | Indicator | Context |
|---|---|---|
| IPV4 | 185[.]141[.]24[.]222 | Listed as an indicator of compromise associated with the Static Tundra activity. |
| IPV4 | 185[.]141[.]24[.]28 | Listed as an indicator of compromise associated with the Static Tundra activity. |
| IPV4 | 185[.]82[.]200[.]181 | Listed as an indicator of compromise associated with the Static Tundra activity. |
| IPV4 | 185[.]82[.]202[.]34 | Listed as an indicator of compromise associated with the Static Tundra activity. |
MITRE ATT&CK
T1018 · Remote System DiscoveryAfter gaining access, the group uses the network-device command “show cdp neighbors” to identify additional systems.T1040 · Network SniffingThe group establishes GRE tunnels to redirect network traffic of intelligence interest for capture and analysis.T1048.003 · Exfiltration Over Unencrypted Non-C2 ProtocolThe group exfiltrates configuration data through TFTP or FTP connections to attacker-controlled infrastructure.T1059.008 · Network Device CLIThe group uses native network-device commands, including commands to modify configuration and retrieve device data.T1136.001 · Local AccountThe group has created privileged local user accounts on compromised devices.T1190 · Exploit Public-Facing ApplicationStatic Tundra exploits CVE-2018-0171 in Cisco IOS and Cisco IOS XE Smart Install to gain access to network devices.T1542.001 · System FirmwareThe SYNful Knock implant is injected into a Cisco IOS image and persists on the device through reboots.T1602.002 · Network Device Configuration DumpThe group retrieves and exfiltrates running or startup configurations from compromised network devices.
CVE
Threat Actors
Malware
Vendors
Products
Cisco IOSvulnerability (CVE-2018-0171), which was patched at the time of the vulnerability publications, in Cisco IOS software's Smart Install feature, targeting unpatched and end-of-life network devices to stealCisco IOS XEexploiting a previously disclosed vulnerability in the Smart Install feature of Cisco IOS software and Cisco IOS XE software (CVE-2018-0171) that has been left unpatched, often after those devices are end-of-life. WeSmart Installwhich was patched at the time of the vulnerability publications, in Cisco IOS software's Smart Install feature, targeting unpatched and end-of-life network devices to steal configuration data and establish
Countries
RussiaThe threat extends beyond Russia's operations — other state-sponsored actors are likely conducting similar network device compromise campaigns, making comprehensive patching and security hardening critical for allUkrainein the telecommunications, higher education and manufacturing sectors. Victims are primarily based in Ukraine and allied countries, but also include other entities globally. Talos estimates Static Tundra will
Industries
Higher EducationPrimary targets include organizations in telecommunications, higher education and manufacturing sectors across North America, Asia, Africa and Europe, with victims selected based on their strategic interest to theManufacturingPrimary targets include organizations in telecommunications, higher education and manufacturing sectors across North America, Asia, Africa and Europe, with victims selected based on their strategic interest to theTelecommunicationsPrimary targets include organizations in telecommunications, higher education and manufacturing sectors across North America, Asia, Africa and Europe, with victims selected based on their strategic interest to the