IE ZoneMap Setting Downgraded To MyComputer Zone For HTTP Protocols

Detects changes to Internet Explorer's (IE / Windows Internet properties) ZoneMap configuration of the "HTTP" and "HTTPS" protocols to point to the "My Computer" zone. This allows downloaded files from the Internet to be granted the same level of trust as files stored locally.

Sigma rule (View on GitHub)

 1title: IE ZoneMap Setting Downgraded To MyComputer Zone For HTTP Protocols
 2id: 3fd4c8d7-8362-4557-a8e6-83b29cc0d724
 3related:
 4    - id: 10344bb3-7f65-46c2-b915-2d00d47be5b0
 5      type: similar
 6status: test
 7description: |
 8        Detects changes to Internet Explorer's (IE / Windows Internet properties) ZoneMap configuration of the "HTTP" and "HTTPS" protocols to point to the "My Computer" zone. This allows downloaded files from the Internet to be granted the same level of trust as files stored locally.
 9references:
10    - https://twitter.com/M_haggis/status/1699056847154725107
11    - https://twitter.com/JAMESWT_MHT/status/1699042827261391247
12    - https://learn.microsoft.com/en-us/troubleshoot/developer/browsers/security-privacy/ie-security-zones-registry-entries
13    - https://www.virustotal.com/gui/file/339ff720c74dc44265b917b6d3e3ba0411d61f3cd3c328e9a2bae81592c8a6e5/content
14author: Nasreddine Bencherchali (Nextron Systems), Michael Haag (idea)
15date: 2023/09/05
16tags:
17    - attack.defense_evasion
18logsource:
19    product: windows
20    category: registry_set
21detection:
22    selection:
23        TargetObject|contains: '\Microsoft\Windows\CurrentVersion\Internet Settings\ZoneMap\ProtocolDefaults'
24        TargetObject|endswith:
25            - '\http'
26            - '\https'
27        Details|contains: 'DWORD (0x00000000)'
28    condition: selection
29falsepositives:
30    - Unknown
31level: high

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