Detection rules › Sigma
Potential Suspicious Browser Launch From Document Reader Process
Detects when a browser process or browser tab is launched from an application that handles document files such as Adobe, Microsoft Office, etc. And connects to a web application over http(s), this could indicate a possible phishing attempt.
MITRE ATT&CK coverage
| Tactic | Techniques |
|---|---|
| Execution | T1204.002 User Execution: Malicious File |
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
or:
Image|endswith: '\brave.exe'
Image|endswith: '\chrome.exe'
Image|endswith: '\firefox.exe'
Image|endswith: '\maxthon.exe'
Image|endswith: '\msedge.exe'
Image|endswith: '\opera.exe'
Image|endswith: '\seamonkey.exe'
Image|endswith: '\vivaldi.exe'
or:
ParentImage|contains: 'Acrobat Reader'
ParentImage|contains: 'Microsoft Office'
ParentImage|contains: 'PDF Reader'
CommandLine|contains: http
Stage 2: not 1 of filter_main_microsoft_help
CommandLine|contains: 'https://go.microsoft.com/fwlink/'
Stage 3: not 1 of filter_optional_foxit
or:
CommandLine|contains: 'http://ad.foxitsoftware.com/adlog.php?'
CommandLine|contains: 'https://globe-map.foxitservice.com/go.php?do=redirect'
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 |
|
Image | ends_with |
|
ParentImage | match |
|