High Severity
Link: ScreenConnect Installer With Suspicious Relay Domain
Description
Detects when a link leads to a ConnectWise ScreenConnect installer and references a relay domain that doesn't match sender or organizational domains.
References
No references.
Sublime Security
Created May 2nd, 2025 • Last updated May 2nd, 2025
Feed Source
Sublime Core Feed
Source
type.inbound
and any(body.links,
strings.ends_with(.href_url.url, ".exe")
and any(ml.link_analysis(., mode="aggressive").files_downloaded,
any(file.explode(.),
any(.scan.strings.strings,
strings.icontains(., "ScreenConnect")
)
and any(filter(.scan.strings.strings,
strings.icontains(., "h=") // relay domain
and strings.icontains(., "k=") // encoded encryption key
),
any(regex.extract(., 'h=(?P<url>[^&]+)'),
strings.parse_url(strings.concat("https://",
.named_groups["url"]
)
).domain.root_domain not in $org_domains
and strings.parse_url(strings.concat("https://",
.named_groups["url"]
)
).domain.root_domain != sender.email.domain.root_domain
)
)
)
)
)
and not profile.by_sender_email().any_messages_benign
Playground
Test against your own EMLs or sample data.