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Adallom, Inc.
Founded2012 (2012)
United States
Area served
Key people
Assaf Rappaport, Ami Luttwak, Roy Reznik
ParentMicrosoft Corporation

Adallom is a cloud security company based in Menlo Park, California. It secures enterprise software-as-a-service (SaaS) application usage, audits user activity, and protects employees and digital assets from threats in real time.[1]

Adallom was reportedly acquired by Microsoft for $320 million in July 2015.[2][3] The Adallom product was rebranded as Microsoft Cloud App Security (MCAS) and announced in general availability as of April 2016.[4] In November 2021, Microsoft Cloud App Security was rebranded as Microsoft Defender for Cloud Apps [5]


Adallom was founded in 2012 by Assaf Rappaport, Ami Luttwak and Roy Reznik, who are former members of the Israeli Intelligence Corps’ Unit 8200 and alumni of the Talpiot program. Adallom’s namesake originates from Ad Halom, otherwise known as the “last line of defense.”[6] Adallom secured $4.5 million in Series A funding from Sequoia Capital and Zohar Zisapel.[7] The company secured $15 million in series B funding led by Index Ventures with contributions from Sequoia Capital Israel.[8]

Adallom was named by CRN as the 10 Coolest Security Startups of 2013.[9]


The founders created Adallom with the adage that SaaS as a class is secure but the way employees actually utilize SaaS is not. In November 2013 Adallom launched a complete security solution that audits activities performed in SaaS applications and develops intelligence to predict and protect from IT security issues, providing SaaS end user enablement while maintaining IT control and visibility. It provides tools to build a consistent security policy across all cloud applications at use within an enterprise.[10]

Adallom’s Smart Engines technology works similarly to the way credit card companies track transactions that appear out of the ordinary because it stops attacks by providing real-time reports of odd behavior.[11]

In December 2013, Adallom discovered and reported a token hijacking vulnerability (CVE-2013-5054) bug in Microsoft Office 365.[12] The identity theft vulnerability in Office 365, found in the wild, allowed attackers to grab user identities and steal email and documents.[13] The problem was reported by Noam Liran, chief software architect at Adallom, and the fix was addressed in Microsoft Security Bulletin MS13-104.[14]


  1. ^ Messmer, Ellen (November 12, 2013). “Start-up Adallom takes on SaaS security monitoring/auditing” Archived January 23, 2014, at the Wayback Machine Network World. Retrieved January 9, 2014
  2. ^ "Microsoft buys Israeli cloud security co Adallom for $320m, With its development center in Tel Aviv, the cyber security company has raised $49.5 million to date". Globes English. July 19, 2015. Archived from the original on July 20, 2015. Retrieved July 20, 2015.
  3. ^ "Microsoft Confirms Purchase Of Cloud Security Firm Adallom – TechCrunch". Retrieved 2018-06-26.
  4. ^ "Microsoft marches forward with its security plan, releasing Cloud App Security". TechCrunch. Retrieved 2020-01-28.
  5. ^ "Announcing Microsoft Defender for Cloud Apps". Retrieved 2021-11-09.
  6. ^ Marshall, David (November 18, 2013). “Startup Adallom takes on SaaS security challenges” InfoWorld. Retrieved January 9, 2014
  7. ^ Shelach, Shmulik (December 12, 2012). “Content security co Adallom raises $4.5m” Globes. Retrieved January 9, 2014
  8. ^ Darrow, Barb (January 20, 2014). “Security startup Adallom scores $15M in funds to build out sales, R&D” GigaOM. Retrieved January 30, 2014
  9. ^ Westervelt, Rob (December 12, 2013). “The 10 Coolest Security Startups Of 2013” CRN. Retrieved January 9, 2014
  10. ^ Kepes, Ben (November 12, 2013). “The Next Israeli Success Story? – Adallom – Uber Control for Cloud Customers” Forbes. Retrieved January 9, 2014
  11. ^ Williams, Alex (November 25, 2013). “The Danger Of Laissez-Faire Security Attitudes” TechCrunch. Retrieved January 9, 2014
  12. ^ Walker, Danielle (December 10, 2013). “Patch Tuesday update addresses 24 bugs, including exploited TIFF zero-day” SC Magazine. Retrieved January 9, 2014
  13. ^ Messmer, Ellen (December 10, 2013). “Identity-theft vulnerability fixed in Microsoft Office 365, says security firm” Archived January 22, 2014, at the Wayback Machine Network World. Retrieved January 9, 2014
  14. ^ Microsoft (December 10, 2013). "Microsoft Security Bulletin MS13-104 - Important." Retrieved January 9, 2014

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