Potential Goopdate.DLL Sideloading

 1title: Potential Goopdate.DLL Sideloading
 2id: b6188d2f-b3c4-4d2c-a17d-9706e0851af0
 3status: test
 4description: Detects potential DLL sideloading of "goopdate.dll", a DLL used by googleupdate.exe
 5references:
 6    - https://www.ncsc.gov.uk/static-assets/documents/malware-analysis-reports/goofy-guineapig/NCSC-MAR-Goofy-Guineapig.pdf
 7author: X__Junior (Nextron Systems), Nasreddine Bencherchali (Nextron Systems)
 8date: 2023/05/15
 9modified: 2023/05/20
10tags:
11    - attack.defense_evasion
12    - attack.privilege_escalation
13    - attack.t1574.001
14    - attack.t1574.002
15logsource:
16    category: image_load
17    product: windows
18detection:
19    selection:
20        ImageLoaded|endswith: '\goopdate.dll'
21    filter_main_generic:
22        ImageLoaded|startswith:
23            # Many third party chromium based apps use this DLLs. It's better to create a baseline and add specific filters
24            - 'C:\Program Files (x86)\'
25            - 'C:\Program Files\'
26    filter_optional_dropbox_installer_temp:
27        Image|contains|all:
28            - '\AppData\Local\Temp\GUM'
29            - '.tmp\Dropbox'
30        ImageLoaded|contains|all:
31            - '\AppData\Local\Temp\GUM'
32            - '.tmp\\goopdate.dll'
33    condition: selection and not 1 of filter_main_* and not 1 of filter_optional_*
34falsepositives:
35    - False positives are expected from Google Chrome installations running from user locations (AppData) and other custom locations. Apply additional filters accordingly.
36    - Other third party chromium browsers located in AppData
37level: medium