Detection rules › Sigma
Potential Persistence Via Outlook Today Page
Detects potential persistence activity via outlook today page. An attacker can set a custom page to execute arbitrary code and link to it via the registry values "URL" and "UserDefinedUrl".
MITRE ATT&CK coverage
| Tactic | Techniques |
|---|---|
| Persistence | T1112 Modify Registry |
| Defense Evasion | T1112 Modify Registry |
Event coverage
| Provider | Event ID | Title |
|---|---|---|
| Sysmon | 13 | RegistryEvent (Value Set) |
Stages and Predicates
Stage 1: selection_main
TargetObject|contains: 'Software\Microsoft\Office\'
TargetObject|contains: '\Outlook\Today\'
Stage 2: 1 of selection_value_stamp
Details: 'DWORD (0x00000001)'
TargetObject|endswith: '\Stamp'
Stage 3: 1 of selection_value_url
or:
TargetObject|endswith: '\URL'
TargetObject|endswith: '\UserDefinedUrl'
Stage 4: not 1 of filter_main_office
or:
Image|startswith: 'C:\Program Files\Common Files\Microsoft Shared\ClickToRun\'
Image|startswith: 'C:\Program Files\Common Files\Microsoft Shared\ClickToRun\Updates\'
Image|endswith: '\OfficeClickToRun.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 |
|---|---|---|
Details | eq |
|
Image | ends_with |
|
Image | starts_with |
|
TargetObject | ends_with |
|
TargetObject | match |
|