Linux Remote System Discovery

 1title: Linux Remote System Discovery
 2id: 11063ec2-de63-4153-935e-b1a8b9e616f1
 3status: test
 4description: Detects the enumeration of other remote systems.
 5references:
 6    - https://github.com/redcanaryco/atomic-red-team/blob/f339e7da7d05f6057fdfcdd3742bfcf365fee2a9/atomics/T1018/T1018.md
 7author: Alejandro Ortuno, oscd.community
 8date: 2020-10-22
 9modified: 2021-11-27
10tags:
11    - attack.discovery
12    - attack.t1018
13logsource:
14    category: process_creation
15    product: linux
16detection:
17    selection_1:
18        Image|endswith: '/arp'
19        CommandLine|contains: '-a'
20    selection_2:
21        Image|endswith: '/ping'
22        CommandLine|contains:
23            - ' 10.' # 10.0.0.0/8
24            - ' 192.168.' # 192.168.0.0/16
25            - ' 172.16.' # 172.16.0.0/12
26            - ' 172.17.'
27            - ' 172.18.'
28            - ' 172.19.'
29            - ' 172.20.'
30            - ' 172.21.'
31            - ' 172.22.'
32            - ' 172.23.'
33            - ' 172.24.'
34            - ' 172.25.'
35            - ' 172.26.'
36            - ' 172.27.'
37            - ' 172.28.'
38            - ' 172.29.'
39            - ' 172.30.'
40            - ' 172.31.'
41            - ' 127.' # 127.0.0.0/8
42            - ' 169.254.' # 169.254.0.0/16
43    condition: 1 of selection*
44falsepositives:
45    - Legitimate administration activities
46level: low