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Create impersonation_chrome_web_store_policy.yml #2255

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Create impersonation_chrome_web_store_policy.yml #2255

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Create impersonation_chrome_web_store_policy.yml
zoomequipd Dec 31, 2024
2053bcf
Auto add rule ID
Dec 31, 2024
54cb0cf
Update impersonation_chrome_web_store_policy.yml
zoomequipd Jan 2, 2025
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Merge branch 'main' into zoomequipd-patch-8
zoomequipd Jan 2, 2025
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76 changes: 76 additions & 0 deletions detection-rules/impersonation_chrome_web_store_policy.yml
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name: "Impersonation: Chrome Web Store Policy"
description: "Detects messages impersonating Chrome Web Store policy communications, including fake extension security alerts and policy acceptance requests. Messages using observed domains and specific HTML formatting patterns typical of this impersonation."
references:
- "https://www.cyberhaven.com/engineering-blog/cyberhavens-preliminary-analysis-of-the-recent-malicious-chrome-extension"
- "https://www.bleepingcomputer.com/news/security/new-details-reveal-how-hackers-hijacked-35-google-chrome-extensions/"
type: "rule"
severity: "high"
source: |
type.inbound
// all observed sender.email.domain have had MX records pointing to smtp.google.com
and strings.ends_with(headers.message_id, '@mail.gmail.com>')
and sender.email.domain.domain != 'gmail.com'
and (
// subject and sender
sender.email.domain.root_domain in (
"chromeforextension.com",
"forextensions.com",
"supportchromestore.com"
)
or (
2 of (
strings.icontains(sender.email.domain.root_domain, 'chrome'),
strings.icontains(sender.email.domain.root_domain, 'support'),
strings.icontains(sender.email.domain.root_domain, 'extension'),
strings.icontains(sender.email.domain.root_domain, 'webstore')
)
)
or strings.icontains(sender.email.local_part, 'chromewebstore')
or strings.icontains(sender.display_name, "Webstore Extension")
or strings.icontains(subject.subject, 'Chrome Web Store Policy')
// body and html
or strings.icontains(body.html.raw,
'<div style="background-color:rgb(65,132,243);padding:50px 20px 0px">'
)
or regex.icontains(body.html.display_text,
'Item name: [^\s]+ security extension'
)
or strings.icontains(body.html.display_text,
'Chrome Web Store Developer Support'
)
or strings.icontains(body.html.display_text, 'Developer Program Policies')
or strings.icontains(body.html.display_text,
'Relevant section of the program policy:'
)
or strings.icontains(body.html.display_text,
'Please accept our policies to continue publishing your products.'
)

// links
or (
length(distinct(body.links, .href_url.domain.root_domain)) < 10
and any(body.links,
.href_url.domain.root_domain in (
"checkpolicy.site",
"extensionpolicyprivacy.com",
"extensionpolicy.net",
"policyextension.info"
)
or .href_url.path == '/extension-policy-check'
or .display_text == "Go To Policy"
)
)
)
attack_types:
- "Credential Phishing"
tactics_and_techniques:
- "Impersonation: Brand"
- "Free email provider"
- "Lookalike domain"
detection_methods:
- "Content analysis"
- "Header analysis"
- "HTML analysis"
- "Sender analysis"
- "URL analysis"
id: "4a98f283-8cc6-5864-bafb-e1908d0a5a8b"
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