Suspicious Bash Reverse Shell via /dev/tcp
- Product
- linux
- Category
- process_creation
- Author
- HuntRule
- Published
- 2026-05-25
- Updated
- 2026-08-28
ATT&CK techniques
Execution → C2Recon
Resource Dev
Initial Access
Persistence
Priv Esc
Defense Evasion
Cred Access
Discovery
Lateral Movement
Collection
Exfiltration
Impact
What it detects
This rule detects Bash command lines that redirect a shell to a /dev/tcp socket, a fileless reverse-shell technique. This was used against Linux and SAP hosts following CVE-2025-31324 exploitation to obtain interactive remote access. Legitimate administrative use of /dev/tcp is uncommon and warrants investigation.
Reporting behind it
- unit42.paloaltonetworks.comhttps://unit42.paloaltonetworks.com/threat-brief-sap-netweaver-cve-2025-31324/
- attack.mitre.orghttps://attack.mitre.org/techniques/T1059/
- aquasec.comhttps://www.aquasec.com/blog/teamtnt-reemerged-with-new-aggressive-cloud-campaign/
- attack.mitre.orghttps://attack.mitre.org/techniques/T1105/
- isc.sans.eduhttps://isc.sans.edu/diary/32024
- attack.mitre.orghttps://attack.mitre.org/techniques/T1059/004/
- attack.mitre.orghttps://attack.mitre.org/techniques/T1071/
Detection content is published as a reviewed draft. Tune thresholds and exclusions against your own telemetry before enabling this rule for alerting.
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