Suspicious Debugger Registration Cmdline

Severity: high
Author: Florian Roth (Nextron Systems), oscd.community, Jonhnathan Ribeiro
Source: upstream

Detects the registration of a debugger for a program that is available in the logon screen (sticky key backdoor).

MITRE ATT&CK coverage

Tactic	Techniques
Persistence	`T1546.008` Event Triggered Execution: Accessibility Features
Privilege Escalation	`T1546.008` Event Triggered Execution: Accessibility Features

Event coverage

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

Stages and Predicates

Stage 1: `all of selection1`

CommandLine|contains: '\CurrentVersion\Image File Execution Options\'

Stage 2: `all of selection2`

or:
CommandLine|contains: HelpPane.exe
CommandLine|contains: atbroker.exe
CommandLine|contains: displayswitch.exe
CommandLine|contains: magnify.exe
CommandLine|contains: narrator.exe
CommandLine|contains: osk.exe
CommandLine|contains: sethc.exe
CommandLine|contains: utilman.exe

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	`HelpPane.exe` `\CurrentVersion\Image File Execution Options\` `atbroker.exe` `displayswitch.exe` `magnify.exe` `narrator.exe` `osk.exe` corpus 2 (sigma 2) `sethc.exe` corpus 2 (sigma 2) `utilman.exe` corpus 2 (sigma 2)