Detection rules › Splunk
Windows Unusual Intelliform Storage Registry Access
The following analytic identifies processes accessing Intelliform Storage Registry keys used by Internet Explorer. It leverages Windows Security Event logs, specifically monitoring EventCode 4663, which tracks object access events. This activity is significant because it can indicate unauthorized access or manipulation of sensitive registry keys used for storing form data in Internet Explorer. If confirmed malicious, this could lead to data exfiltration, credential theft, or further compromise of the system.
MITRE ATT&CK coverage
| Tactic | Techniques |
|---|---|
| Credential Access | T1552.001 Unsecured Credentials: Credentials In Files |
Event coverage
| Provider | Event ID | Title |
|---|---|---|
| Security-Auditing | 4663 | An attempt was made to access an object. |
Stages and Predicates
Stage 1: search
search NOT ProcessName IN ("C:\\Program Files\\Internet Explorer\\iexplore.exe", "C:\\Windows\\SysWow64\\dllhost.exe", "C:\\Windows\\System32\\dllhost.exe") EventCode=4663 ObjectName="*Software\\microsoft\\Internet Explorer\\Intelliforms\\storage2*"
Stage 2: stats
stats BY ObjectName, ObjectType, ProcessName, AccessMask, process_id, EventCode, Computer, Caller_User_Name
Stage 3: rename
rename
Stage 4: search
search
Stage 5: search
search
Stage 6: search
search `macro`
Exclusions
Top-level NOT(...) conjuncts — predicates this rule actively suppresses.
| Stage | Field | Kind | Excluded values |
|---|---|---|---|
| 1 | process_name | in | "C:\\Program Files\\Internet Explorer\\iexplore.exe", "C:\\Windows\\SysWow64\\dllhost.exe", "C:\\Windows\\System32\\dllhost.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 |
|---|---|---|
EventCode | eq |
|
ObjectName | in |
|
Neighbors
Broader alternatives (more inclusive than this rule)
These rules match a superset of what this rule catches. They cover the same events plus more. Use them if you want wider coverage and can absorb more false positives.
- Windows Credential Access From Browser Password Store (drops 2 filters this rule applies)