Detection rules › Splunk
Windows Input Capture Using Credential UI Dll
The following analytic detects a process loading the credui.dll or wincredui.dll module. This detection leverages Sysmon EventCode 7 to identify instances where these DLLs are loaded by processes outside typical system directories. This activity is significant because adversaries often abuse these modules to create fake credential prompts or dump credentials, posing a risk of credential theft. If confirmed malicious, this activity could allow attackers to harvest user credentials, leading to unauthorized access and potential lateral movement within the network.
MITRE ATT&CK coverage
| Tactic | Techniques |
|---|---|
| Credential Access | T1056.002 Input Capture: GUI Input Capture |
| Collection | T1056.002 Input Capture: GUI Input Capture |
Event coverage
| Provider | Event ID | Title |
|---|---|---|
| Sysmon | 7 | Image loaded |
Stages and Predicates
Stage 1: search
search ((NOT Image IN ("*:\\program files*", "*\\windows\\explorer.exe", "*\\windows\\sysWow64\\*", "*\\windows\\system32\\*") ImageLoaded="*\\wincredui.dll" OriginalFileName="wincredui.dll") OR (ImageLoaded="*\\credui.dll" OriginalFileName="credui.dll")) EventCode=7
Stage 2: fillnull
fillnull
Stage 3: stats
stats BY Image, ImageLoaded, dest, loaded_file, loaded_file_path, original_file_name, process_exec, process_guid, process_hash, process_id, process_name, process_path, service_dll_signature_exists, service_dll_signature_verified, signature, signature_id, user_id, vendor_product
Stage 4: search
search
Stage 5: search
search
Stage 6: search
search `macro`
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 |
|
ImageLoaded | eq |
|
OriginalFileName | eq |
|
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 Remote Access Software BRC4 Loaded Dll (drops 1 filter this rule applies)