System Network Connections Discovery Via Net.EXE

Severity: low
Author: frack113
Source: upstream

Adversaries may attempt to get a listing of network connections to or from the compromised system they are currently accessing or from remote systems by querying for information over the network.

MITRE ATT&CK coverage

Tactic	Techniques
Discovery	`T1049` System Network Connections Discovery

Event coverage

Provider	Event ID	Title
Sysmon	1	Process creation

Stages and Predicates

Stage 1: `all of selection_img`

or:
Image|endswith: '\net.exe'
Image|endswith: '\net1.exe'
OriginalFileName: net.exe
OriginalFileName: net1.exe

Stage 2: `all of selection_cli`

or:
CommandLine|endswith: ' sessions'
CommandLine|endswith: ' use'
CommandLine|contains: ' sessions '
CommandLine|contains: ' use '

Indicators

Each row is a field, operator, and value that the rule matches. The corpus column counts how many other rules in the catalog look for the same combination: high numbers point to widely-used, community-vetted indicators. Blank or 1 shows that the indicator is specific to this rule.

Field	Kind	Values
`CommandLine`	ends_with	`sessions` `use`
`CommandLine`	match	`sessions` `use` corpus 6 (sigma 6)
`Image`	ends_with	`\net.exe` corpus 27 (sigma 27) `\net1.exe` corpus 25 (sigma 25)
`OriginalFileName`	eq	`net.exe` corpus 16 (sigma 16) `net1.exe` corpus 16 (sigma 16)