HackTool - EfsPotato Named Pipe Creation

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

Detects the pattern of a pipe name as used by the hack tool EfsPotato

MITRE ATT&CK coverage

Tactic	Techniques
Privilege Escalation	`T1055` Process Injection
Defense Evasion	`T1055` Process Injection

Event coverage

Provider	Event ID	Title
Sysmon	17	PipeEvent (Pipe Created)
Sysmon	18	PipeEvent (Pipe Connected)

Stages and Predicates

Stage 1: `selection`

or:
PipeName|contains: '\pipe\'
PipeName|contains: '\pipe\srvsvc'

Stage 2: `not 1 of filter_optional_*`

or:
PipeName|contains: '\CtxShare'
PipeName|startswith: '\pipe\'

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
`PipeName`	match	`\CtxShare` `\pipe\` `\pipe\srvsvc`
`PipeName`	starts_with	`\pipe\`