Merge PR #4822 from @hasselj - Add `Potentially Suspicious Malware Ca…

…llback Communication - Linux` new: Potentially Suspicious Malware Callback Communication - Linux --------- Co-authored-by: nasbench <8741929+nasbench@users.noreply.github.com>
SigmaHQ · May 10, 2024 · 6412c1a · 6412c1a
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commit 6412c1a
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diff --git a/rules/linux/network_connection/net_connection_lnx_susp_malware_callback_port.yml b/rules/linux/network_connection/net_connection_lnx_susp_malware_callback_port.yml
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+title: Potentially Suspicious Malware Callback Communication - Linux
+id: dbfc7c98-04ab-4ab7-aa94-c74d22aa7376
+related:
+    - id: 4b89abaa-99fe-4232-afdd-8f9aa4d20382
+      type: derived
+status: experimental
+description: |
+    Detects programs that connect to known malware callback ports based on threat intelligence reports.
+references:
+    - https://www.mandiant.com/resources/blog/triton-actor-ttp-profile-custom-attack-tools-detections
+    - https://www.mandiant.com/resources/blog/ukraine-and-sandworm-team
+    - https://www.elastic.co/guide/en/security/current/potential-non-standard-port-ssh-connection.html
+    - https://thehackernews.com/2024/01/systembc-malwares-c2-server-analysis.html
+    - https://www.cybereason.com/blog/sliver-c2-leveraged-by-many-threat-actors
+author: hasselj
+date: 2024/05/10
+tags:
+    - attack.persistence
+    - attack.command_and_control
+    - attack.t1571
+logsource:
+    category: network_connection
+    product: linux
+detection:
+    selection:
+        Initiated: 'true'
+        DestinationPort:
+            - 888
+            - 999
+            - 2200
+            - 2222
+            - 4000
+            - 4444
+            - 6789
+            - 8531
+            - 50501
+            - 51820
+    filter_main_local_ranges:
+        DestinationIp|cidr:
+            - '127.0.0.0/8'
+            - '10.0.0.0/8'
+            - '172.16.0.0/12'
+            - '192.168.0.0/16'
+            - '169.254.0.0/16'
+            - '::1/128'         # IPv6 loopback
+            - 'fe80::/10'       # IPv6 link-local addresses
+            - 'fc00::/7'        # IPv6 private addresses
+    condition: selection and not 1 of filter_main_*
+falsepositives:
+    - Unknown
+level: high