Uncommon Child Process Of Conhost.EXE

Severity: medium
Author: omkar72
Source: upstream

Detects uncommon "conhost" child processes. This could be a sign of "conhost" usage as a LOLBIN or potential process injection activity.

MITRE ATT&CK coverage

Tactic	Techniques
Defense Evasion	`T1202` Indirect Command Execution

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`

ParentImage|endswith: '\conhost.exe'

Stage 2: `not 1 of filter_main_*`

or:
Image|endswith: ':\Windows\System32\conhost.exe'
Image: ''
Image: null

Stage 3: `not 1 of filter_optional_provider`

Provider_Name: SystemTraceProvider-Process

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
`Image`	ends_with	`:\Windows\System32\conhost.exe` corpus 2 (sigma 2)
`ParentImage`	ends_with	`\conhost.exe` corpus 2 (sigma 2)
`Provider_Name`	eq	`SystemTraceProvider-Process`