Potential PsExec Remote Execution

Severity: high
Author: Florian Roth (Nextron Systems), Nasreddine Bencherchali (Nextron Systems)
Source: upstream

Detects potential psexec command that initiate execution on a remote systems via common commandline flags used by the utility

MITRE ATT&CK coverage

Tactic	Techniques
Resource Development	`T1587.001` Develop Capabilities: Malware

Event coverage

Provider	Event ID	Title
Sysmon	1	Process creation
Security-Auditing	4688	A new process has been created.

Stages and Predicates

Stage 1: `selection`

CommandLine|contains: ' -p '
CommandLine|contains: ' -u '
CommandLine|contains: ' \\\\'
CommandLine|contains: accepteula

Stage 2: `not 1 of filter_main_localhost`

or:
CommandLine|contains: '\\\\127.'
CommandLine|contains: '\\\\localhost'

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`	match	`-p` corpus 5 (sigma 5) `-u` corpus 4 (sigma 4) `\\\\` corpus 8 (sigma 8) `\\\\127.` `\\\\localhost` `accepteula` corpus 3 (sigma 3)