Hayabusa medium test sigma
CredUI.DLL Loaded By Uncommon Process
Detects loading of "credui.dll" and related DLLs by an uncommon process. Attackers might leverage this DLL for potential use of "CredUIPromptForCredentials" or "CredUnPackAuthenticationBufferW".
Detection Logic
{
"image_load": {
"EventID": 7,
"Channel": "Microsoft-Windows-Sysmon/Operational"
},
"selection": [
{
"ImageLoaded
| endswith": [
"\\credui.dll",
"\\wincredui.dll"
]
},
{
"OriginalFileName": [
"credui.dll",
"wincredui.dll"
]
}
],
"filter_main_generic": {
"Image
| startswith": [
"C:\\Program Files (x86)\\",
"C:\\Program Files\\",
"C:\\Windows\\System32\\",
"C:\\Windows\\SysWOW64\\",
"C:\\Windows\\SystemApps\\"
]
},
"filter_main_full": {
"Image": [
"C:\\Windows\\explorer.exe",
"C:\\Windows\\ImmersiveControlPanel\\SystemSettings.exe",
"C:\\Windows\\regedit.exe"
]
},
"filter_optional_opera": {
"Image
| endswith": "\\opera_autoupdate.exe"
},
"filter_optional_process_explorer": {
"Image
| endswith": [
"\\procexp64.exe",
"\\procexp64a.exe",
"\\procexp.exe"
]
},
"filter_optional_teams": {
"Image
| startswith": "C:\\Users\\",
"Image
| contains": "\\AppData\\Local\\Microsoft\\Teams\\",
"Image
| endswith": "\\Teams.exe"
},
"filter_optional_onedrive": {
"Image
| startswith": "C:\\Users\\",
"Image
| contains": "\\AppData\\Local\\Microsoft\\OneDrive\\"
},
"condition": "image_load and (selection and not 1 of filter_main_* and not 1 of filter_optional_*)"
} False Positives
- ⚠ Other legitimate processes loading those DLLs in your environment.
Field Validations
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