Tag: dkim
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Microsoft leads takedown of Tycoon2FA phishing service infrastructure
Stringent defenses needed: CSOs must employ stringent defenses against tools that use reverse proxies, Beggs said, including strengthening email filtering by enforcing DMARC, DKIM, and SPF; enforcing secure session handling at the edge by using client-bound session tokens tied to device or TLS certificates; ensuring continuous validation by issuing a new challenge when the device fingerprint…
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Microsoft leads takedown of Tycoon2FA phishing service infrastructure
Stringent defenses needed: CSOs must employ stringent defenses against tools that use reverse proxies, Beggs said, including strengthening email filtering by enforcing DMARC, DKIM, and SPF; enforcing secure session handling at the edge by using client-bound session tokens tied to device or TLS certificates; ensuring continuous validation by issuing a new challenge when the device fingerprint…
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Phishing Campaign Uses Google Cloud to Host Malicious Redirects via GCS Bucket
A sophisticated phishing campaign has recently emerged, leveraging Google Cloud’s trusted infrastructure to host malicious redirects. The campaign’s technical structure leverages Google Cloud Storage legitimate domain, googleapis.com, which is widely trusted by mail gateways and end users alike. This provides the attackers an opportunity to bypass common security layers such as SPF and DKIM validation.…
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The DocuSign Email That Wasn’t A Three-Redirect Credential Harvest
<div cla TL;DR Attackers sent a convincing DocuSign notification with a “Review & Sign” button that chained through Google Maps redirects to an Amazon S3-hosted credential harvesting page. The redirect chain defeated URL scanners, and real law-firm footers added legitimacy. IRONSCALES Adaptive AI flagged the behavioral mismatch between sender infrastructure and brand identity before the first…
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The DocuSign Email That Wasn’t A Three-Redirect Credential Harvest
<div cla TL;DR Attackers sent a convincing DocuSign notification with a “Review & Sign” button that chained through Google Maps redirects to an Amazon S3-hosted credential harvesting page. The redirect chain defeated URL scanners, and real law-firm footers added legitimacy. IRONSCALES Adaptive AI flagged the behavioral mismatch between sender infrastructure and brand identity before the first…
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DKIM-Replay: Manipulierte Online-Formulare täuschen selbst Sicherheitslösungen
Solche Angriffe richten sich nicht nur an Privatpersonen. Auch Mitarbeiter von Unternehmen können Zielscheibe werden. Deshalb ist es für Unternehmen entscheidend, ihre Teams regelmäßig über solche Bedrohungen zu informieren. First seen on infopoint-security.de Jump to article: www.infopoint-security.de/dkim-replay-manipulierte-online-formulare-taeuschen-selbst-sicherheitsloesungen/a43817/
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Post-Quantum Cryptography for DKIM, PGP, and S/MIME: Quantum Threat to Email Security
Quantum computers won’t break the internet tomorrow”¦ but they will break your email security sooner than you think. Today, cybercriminals and state-sponsored groups are quietly collecting encrypted emails in bulk. They know they can’t crack the encryption today. That’s fine. They don’t need to. They’re playing the long game. This tactic has a name: Store-Now-Decrypt-LaterRead…
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Hackers Abuse Apple PayPal Invoice Emails in DKIM Replay Attack Campaign
A sophisticated way to bypass email security by weaponizing legitimate messages from trusted companies like Apple and PayPal. These attacks, known as DKIM replay attacks, exploit email authentication systems to deliver scams that appear completely authentic. The technique is deceptively simple. Attackers create accounts on platforms like Apple’s App Store or PayPal and manipulate user-controlled…
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Phishing and OAuth Token Vulnerabilities Lead to Full Microsoft 365 Breach
Two medium-severity vulnerabilities, an unsecured email API endpoint and verbose error messages exposing OAuth tokens, chain together to enable authenticated phishing that bypasses all email security controls, persistent access to Microsoft 365 environments While protocols like SPF, DKIM, and DMARC have made traditional domain spoofing difficult, attackers have evolved. They now seek ways to send…
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Email-first cybersecurity predictions for 2026
Explore key cybersecurity predictions for 2026, from AI-powered phishing to DMARC enforcement, BIMI adoption, SPF and DKIM limits, Zero Trust, and automation. First seen on securityboulevard.com Jump to article: securityboulevard.com/2026/01/email-first-cybersecurity-predictions-for-2026/
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BlindEagle Targets Colombian Government Agency with Caminho and DCRAT
Tags: access, attack, authentication, cloud, communications, control, cybercrime, defense, detection, dkim, dmarc, dns, email, encryption, flaw, government, group, infrastructure, injection, Internet, malicious, malware, microsoft, open-source, phishing, powershell, rat, service, spear-phishing, startup, tactics, threat, tool, update, usa, windowsIntroductionIn early September 2025, Zscaler ThreatLabz discovered a new spear phishing campaign attributed to BlindEagle, a threat actor who operates in South America and targets users in Spanish-speaking countries, such as Colombia. In this campaign, BlindEagle targeted a government agency under the control of the Ministry of Commerce, Industry and Tourism (MCIT) in Colombia using…
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BEC: Explaining Business Email Compromise
Learn what Business Email Compromise (BEC) is, how to spot common scams, respond to attacks, and use SPF, DKIM, and DMARC to prevent future fraud. First seen on securityboulevard.com Jump to article: securityboulevard.com/2025/12/bec-explaining-business-email-compromise/
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A Step-by-Step Guide to Setting Up SPF, DKIM, and DMARC for MailerLite
Learn how to set up SPF, DKIM, and DMARC for MailerLite to secure your domain, prevent spoofing, and boost email deliverability step-by-step. First seen on securityboulevard.com Jump to article: securityboulevard.com/2025/11/a-step-by-step-guide-to-setting-up-spf-dkim-and-dmarc-for-mailerlite/
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A Step-by-Step Guide to Setting Up SPF, DKIM, and DMARC for Zoho Mail
Learn how to configure SPF, DKIM, and DMARC for Zoho Mail to secure your domain, prevent spoofing, and boost email deliverability step-by-step. First seen on securityboulevard.com Jump to article: securityboulevard.com/2025/11/a-step-by-step-guide-to-setting-up-spf-dkim-and-dmarc-for-zoho-mail/
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A Step-by-Step Guide to Setting Up SPF, DKIM, and DMARC for MailerLite
Learn how to set up SPF, DKIM, and DMARC for MailerLite to secure your domain, prevent spoofing, and boost email deliverability step-by-step. First seen on securityboulevard.com Jump to article: securityboulevard.com/2025/11/a-step-by-step-guide-to-setting-up-spf-dkim-and-dmarc-for-mailerlite/
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Affiliate Marketing Emails: Fix Deliverability to Stop Commission Loss
Struggling with affiliate email deliverability? Learn how to align SPF & DKIM to ensure your promos reach the inbox and protect your affiliate commissions. First seen on securityboulevard.com Jump to article: securityboulevard.com/2025/10/affiliate-marketing-emails-fix-deliverability-to-stop-commission-loss/
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Affiliate Marketing Emails: Fix Deliverability to Stop Commission Loss
Struggling with affiliate email deliverability? Learn how to align SPF & DKIM to ensure your promos reach the inbox and protect your affiliate commissions. First seen on securityboulevard.com Jump to article: securityboulevard.com/2025/10/affiliate-marketing-emails-fix-deliverability-to-stop-commission-loss/
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How phishers are weaponizing SVG images in zero-click, evasive campaigns
Innovative, evasive, and targeted campaigns: Researchers pointed out that traditional endpoint detection, antivirus tools, and even email filters struggle to spot this threat because image files like SVGs are rarely considered dangerous. Compared to previous SVG-based attacks that used hosted payloads, this method keeps everything self-contained, further slipping past defenses.Victims span B2B service providers, utilities,…
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Microsoft-Lücke ermöglicht E-Mail-Versand ohne Authentifizierung
Tags: access, authentication, ciso, cyberattack, data, defense, dkim, dmarc, exploit, framework, hacker, infrastructure, mail, microsoft, phishing, powershell, qr, risk, tool, usa, vulnerability, zero-dayDrucker und Scanner werden dank einer Schwachstelle in der Microsoft 365 Direct Send-Funktion zunehmend zu Mitteln für Hacker, um Phishing-Angriffe durchzuführen.Das Forensik-Team von Varonis hat eine Schwachstelle entdeckt, die es internen Geräten wie Druckern ermöglicht, E-Mails ohne Authentifizierung zu versenden. Dem Bericht zufolgewurde die Lücke bereits genutzt, um mehr als 70 Unternehmen, vorwiegend in den…
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Don’t trust that email: It could be from a hacker using your printer to scam you
Tags: authentication, control, credentials, data, defense, dkim, dmarc, email, endpoint, exploit, framework, hacker, infrastructure, iot, login, mail, microsoft, monitoring, network, phishing, powershell, qr, risk, scam, tactics, tool, vulnerability, zero-daytenantname.mail.protection.outlook.com, and companies’ internal email address formats can be trivial to figure out or easy to scrape from public sources or social media. Once an attacker has the domain and a valid email address, they are able to send emails that appear to come from inside the organization.In the campaign observed by Varonis’ forensics experts,…
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‘Secure email’: A losing battle CISOs must give up
End-to-end encryption remains elusive: Email continues to be the dominant electronic communication tool today because it is well understood, relatively easy to use, and relatively inexpensive. By and large, businesses have approved email for sending confidential information, and we often convince ourselves that it is secure, can be secured with third-party tools, or it’s “good…
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Microsoft Sender Requirements Enforced , How to Avoid 550 5.7.15 Rejections
Starting May 5, 2025, Microsoft enforces strict sender requirements. Emails from domains sending over 5,000 messages per day must pass SPF, DKIM, and DMARC checks.”, or face the 550 5.7.15 Access Denied error. First seen on securityboulevard.com Jump to article: securityboulevard.com/2025/04/microsoft-sender-requirements-enforced-how-to-avoid-550-5-7-15-rejections/
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Email Health Checklist: How to Boost Inbox Placement
Is your email health hurting deliverability? Learn how to fix bounce rates, set up SPF, DKIM, and DMARC, and boost inbox placement with this step-by-step guide. First seen on securityboulevard.com Jump to article: securityboulevard.com/2025/04/email-health-checklist-how-to-boost-inbox-placement/
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Fake Google Security Alert Hides a Phishing Scam
A developer reported the scam after noticing a slight discrepancy in the email address. The scam passed Google’s own DKIM checks. First seen on techrepublic.com Jump to article: www.techrepublic.com/article/news-google-oauth-scam/
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FBI warnt vor komplexen »No Click«Mail-Angriffen
Komplexe E-Mail-Angriffe umgehen immer häufiger traditionelle Sicherheitsmaßnahmen und befördern die betreffende Nachricht direkt in den Posteingang. Tatsächlich sind aktuelle Attacken so ausgeklügelt, dass 89 % der Angreifer es geschafft haben, verschiedene Methoden bei der E-Mail-Authentifizierung zu umgehen [1]. Dazu zählen SPF (Sender Policy Frameworks), DKIM (Domain Keys Identified Mail) und DMARC (Domain-based Message Authentication, Reporting, and Conformance). Grundsätzlich sollen……
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DMARC vs DKIM: Key Differences How They Work Together
DMARC Vs DKIM: key differences between DMARC and DKIM, how they work together, and why combining both is essential for email security and deliverability. First seen on securityboulevard.com Jump to article: securityboulevard.com/2025/02/dmarc-vs-dkim-key-differences-how-they-work-together/
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E-Mails: Experten schleusen Fälschungen mittels geknackter DKIM-Schlüssel ein
Mit geringem Aufwand brachten die Sicherheitsexperten drei Anbieter dazu, eine gefälschte E-Mail zu akzeptieren. Admins sollten ihr Mail-Setup checken. First seen on heise.de Jump to article: www.heise.de/news/E-Mails-Experten-schleusen-Faelschungen-mittels-geknackter-DKIM-Schluessel-ein-10242534.html
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Was steckt hinter DKIM, SPF und DMARC?
E-Mail-Sicherheit für Security Operations Center (SOC) Teams. Was versteckt sich hinter Begriffen wie DKIM, SPF und DMARC, die zur Absicherung der E-Mail-Kommunikation verwendet wird? Mir ist die Tage ein Post mit einem Bild untergekommen, welches die Begriffe DKIM (Domain keys … First seen on borncity.com Jump to article: www.borncity.com/blog/2025/01/01/was-steckt-hinter-dkim-spf-und-dmarc/