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Sublime Security
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Sublime Security
@sublime_sec
Sublime Security is the adaptive, AI-powered cloud email security platform that combines best-in-class effectiveness with unprecedented visibility and control.
sublime.security
Born January 3
Joined June 2018
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  • Pinned
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    Sublime Security
    @sublime_sec
    Oct 28, 2025
    We’re excited to announce that Sublime has raised $150M in a Series C led by @Georgian_io, joined by new investors @Avenir_Growth, @01Advisors, @jonoberheide, and @nicoleperlroth, and existing investors @IndexVentures, @IVP, @slow, and @CitiVentures. This year we launched ASA
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    21K
  • user avatar
    Sublime Security
    @sublime_sec
    Mar 27, 2020
    We've open sourced the lists we maintain and use primarily for phishing defense. Includes: - free email providers - free subdomain hosts - url shorteners - suspicious content - many more github.com/sublime-securi… Contributions welcome.
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    GitHub - sublime-security/static-files: A collection of static files maintained by the Sublime...
    From github.com
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    Sublime Security
    @sublime_sec
    Feb 21, 2023
    Defenders know their environments better than anyone, but they haven't been able to truly capitalize on that knowledge in email — until today. Sublime Platform is now generally available. Deploy in minutes using Docker, for free.
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    Introducing Sublime: A new, open approach to email security · Blog · Sublime Security
    From sublime.security
    20K
  • user avatar
    Sublime Security
    @sublime_sec
    Dec 8, 2023
    We've observed an increase in attackers abusing legitimate, high reputation services such as DocuSign to deliver callback phishing attacks. These are actual messages from DocuSign, and pass SPF/DKIM/DMARC. In the past, we've observed this via PayPal Invoice abuse and others.
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    29K
  • user avatar
    Sublime Security
    @sublime_sec
    Jun 29, 2023
    Sublime has observed an increase in QR code credential phishing attacks over the past several weeks. We've enabled a new scanner to decode QR codes embedded in message bodies or attachments, and pushed new coverage to prevent these attacks: github.com/sublime-securi…
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    88K
  • user avatar
    Sublime Security
    @sublime_sec
    Oct 5, 2023
    It's been a busy week for QR code phishing, so @samkscholten put together a deep dive on how Sublime detects and decodes these email attacks with our open source rules: sublime.security/blog/qr-code-p…
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    9.9K
  • user avatar
    Sublime Security
    @sublime_sec
    Feb 15, 2024
    We've just released a rule to detect and prevent attempts to exploit the recent Outlook CVE-2024-21413: sublime.security/feeds/core/det… h/t @samkscholten
    4.6K
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    Sublime Security
    @sublime_sec
    Feb 27, 2023
    Announcing Whois enrichments: You can now block email messages from newly registered domains. Whois is available as a new MQL function, beta.whois(), so you can enrich any domain in the message including the sender, link domains, or domains found in attachments.
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    9.2K
  • user avatar
    Sublime Security
    @sublime_sec
    Dec 18, 2023
    We're excited to launch Attack Surface Reduction for email. On endpoints, app allowlisting leaves attackers with fewer ways to perform attacks. On networks, Secure Web Gateways can block outbound requests to new domains. Now, you can do the same in Microsoft 365 & Google 🧵
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    Sublime Security
    @sublime_sec
    Apr 24, 2024
    Big news today! 🎉 Read more about our funding announcement and where we're headed next: sublime.security/blog/announcin…
    user avatar
    Josh Kamdjou
    @jkamdjou
    Apr 24, 2024
    I’m extremely excited to announce that @sublime_sec has raised a $20M Series A led by @IndexVentures with participation from @DAlperovitch I wrote about our journey from black box to open platform, and where we're headed: sublime.security/blog/announcin…
    12K
  • user avatar
    Sublime Security
    @sublime_sec
    Dec 7, 2022
    You can now use MQL to detect HTML Smuggling attacks delivered via email body links. Detect+block+hunt for these techniques, recently observed to deliver Qakbot and other malware: - URL->Encrypted zip->ISO - URL->Zip->ISO->LNK - URL->Zip->IMG->VBS - and more How it works:
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    Sublime Security
    @sublime_sec
    Mar 31, 2023
    New blog: @filar shares how Sublime uses Siamese Neural Networks, Object Detection, and other signals within MQL to identify credential phishing attacks.
    sublime.security
    Detecting Credential Phishing using Deep Learning + MQL · Blog · Sublime Security
    Learn how Sublime uses Siamese Neural Networks, Object Detection, and other signals within MQL to identify credential phishing attacks.
    7.7K
  • user avatar
    Sublime Security
    @sublime_sec
    Jul 30, 2019
    We’re very excited to finally write about @emailrepio, a free API we released for querying email reputation. It’s been invaluable for #phishing defense and now supports reporting of malicious senders from trusted researchers and organizations.
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    EmailRep: Free API to query email reputation and report malicious senders
    From blog.sublimesecurity.com
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    Sublime Security
    @sublime_sec
    Aug 26, 2023
    👋 In Chicago at #BlueTeamCon? Come say hi to @ianthiel and @jkamdjou and grab some special edition RFC5322 swag!
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