Detection rules › Sigma
Atbroker Registry Change
Detects creation/modification of Assistive Technology applications and persistence with usage of 'at'
MITRE ATT&CK coverage
| Tactic | Techniques |
|---|---|
| Persistence | T1547 Boot or Logon Autostart Execution |
| Privilege Escalation | T1547 Boot or Logon Autostart Execution |
| Defense Evasion | T1218 System Binary Proxy Execution |
Event coverage
| Provider | Event ID | Title |
|---|---|---|
| Sysmon | 12 | RegistryEvent (Object create and delete) |
| Sysmon | 13 | RegistryEvent (Value Set) |
| Sysmon | 14 | RegistryEvent (Key and Value Rename) |
Stages and Predicates
Stage 1: selection
or:
TargetObject|contains: 'Software\Microsoft\Windows NT\CurrentVersion\Accessibility\ATs'
TargetObject|contains: 'Software\Microsoft\Windows NT\CurrentVersion\Accessibility\Configuration'
Stage 2: not 1 of filter_*
or:
Details: '(Empty)'
Image: 'C:\Windows\system32\atbroker.exe'
TargetObject|contains: '\Microsoft\Windows NT\CurrentVersion\Accessibility\Configuration'
Image|startswith: 'C:\Windows\Installer\MSI'
TargetObject|contains: 'Software\Microsoft\Windows NT\CurrentVersion\Accessibility\ATs'
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 |
|---|---|---|
Details | eq |
|
Image | eq |
|
Image | starts_with |
|
TargetObject | match |
|