Potential Dosfuscation Activity

Severity: medium
Author: frack113, Nasreddine Bencherchali (Nextron Systems)
Source: upstream

Detects possible payload obfuscation via the commandline

MITRE ATT&CK coverage

Tactic	Techniques
Execution	`T1059` Command and Scripting Interpreter

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`

or:
CommandLine|contains: ' c^m^d'
CommandLine|contains: ' c^md'
CommandLine|contains: ' cm^d'
CommandLine|contains: ' s^e^t '
CommandLine|contains: ' s^et '
CommandLine|contains: ' se^t '
CommandLine|contains: '%COMSPEC:~'
CommandLine|contains: '(,(,'
CommandLine|contains: ',;,'
CommandLine|contains: ';; ;;'
CommandLine|contains: ';;;;'
CommandLine|contains: '^^'
CommandLine|contains: '^c^m^d'
CommandLine|contains: '^cm^d'
CommandLine|contains: '^|^'

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.