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	"created_at": "2026-04-06T00:17:06.683591Z",
	"updated_at": "2026-04-10T03:37:32.461073Z",
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	"sha1_hash": "d1741575c242a855f9a784ac6d69a7c6d0b10c5b",
	"title": "Mimecast links security breach to SolarWinds hackers",
	"llm_title": "",
	"authors": "",
	"file_creation_date": "0001-01-01T00:00:00Z",
	"file_modification_date": "0001-01-01T00:00:00Z",
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	"plain_text": "Mimecast links security breach to SolarWinds hackers\r\nBy Sergiu Gatlan\r\nPublished: 2021-01-26 · Archived: 2026-04-05 15:56:41 UTC\r\nEmail security company Mimecast has confirmed today that the threat actor behind the SolarWinds supply-chain attack is\r\nbehind the security breach it disclosed earlier this month.\r\n\"Our investigation has now confirmed that this incident is related to the SolarWinds Orion software compromise and was\r\nperpetrated by the same sophisticated threat actor,\" Mimecast said.\r\n\"Our investigation also showed that the threat actor accessed, and potentially exfiltrated, certain encrypted service account\r\ncredentials created by customers hosted in the United States and the United Kingdom.\r\nhttps://www.bleepingcomputer.com/news/security/mimecast-links-security-breach-to-solarwinds-hackers/\r\nPage 1 of 4\n\nhttps://www.bleepingcomputer.com/news/security/mimecast-links-security-breach-to-solarwinds-hackers/\r\nPage 2 of 4\n\nVisit Advertiser websiteGO TO PAGE\r\n\"These credentials establish connections from Mimecast tenants to on-premise and cloud services, which include LDAP,\r\nAzure Active Directory, Exchange Web Services, POP3 journaling, and SMTP-authenticated delivery routes.\"\r\nThe company added that there is no evidence that any of the encrypted credentials accessed during the breach were\r\ndecrypted or misused.\r\nHowever, United States and United Kingdom Mimecast customers are advised to reset credentials to prevent potential\r\nattacks from abusing them.\r\nThe threat actor that coordinated the SolarWinds supply-chain attacks is tracked as StellarParticle (CrowdStrike), UNC2452\r\n(FireEye), SolarStorm (Palo Alto Unit 42), and Dark Halo (Volexity).\r\nWhile its identity remains unknown, a joint statement issued by the FBI, CISA, ODNI, and the NSA says that it is likely a\r\nRussian-backed Advanced Persistent Threat (APT) group.\r\nKaspersky also made a connection between the Russian Turla hacking group and the SolarWinds hackers after finding\r\nfeature overlaps between the Sunburst backdoor and the Kazuar backdoor linked to Turla in the past.\r\nAttack discovered following a Microsoft notification\r\nThe company was alerted by Microsoft that some of its self-issued certificates customers use to authenticate to a subset of\r\nMimecast’s products were compromised.\r\nWhile the exact number of affected customers using the stolen certificates to secure the connection to the Microsoft 365\r\ncloud was not disclosed, Mimecast said that roughly 10 percent of their customers \"use this connection.\"\r\nMimecast's products are currently used by more than 36,000 customers, with 10% of them amounting to roughly 3,600\r\nimpacted customers.\r\nThe company found evidence that \"a low single-digit number of our customers' M365 tenants were targeted\" by the\r\nSolarWinds hackers.\r\nMimecast reached out to these customers to remediate and address this issue and, according to today's update, \"[t]he vast\r\nmajority of these customers have taken this action, and Microsoft has now disabled use of the former connection keys for all\r\naffected Mimecast customers.\"\r\nOne week ago, cybersecurity firm Malwarebytes also confirmed that the SolarWinds hackers were able to gain access to\r\nsome internal company emails.\r\nhttps://www.bleepingcomputer.com/news/security/mimecast-links-security-breach-to-solarwinds-hackers/\r\nPage 3 of 4\n\nAutomated Pentesting Covers Only 1 of 6 Surfaces.\r\nAutomated pentesting proves the path exists. BAS proves whether your controls stop it. Most teams run one without the\r\nother.\r\nThis whitepaper maps six validation surfaces, shows where coverage ends, and provides practitioners with three diagnostic\r\nquestions for any tool evaluation.\r\nSource: https://www.bleepingcomputer.com/news/security/mimecast-links-security-breach-to-solarwinds-hackers/\r\nhttps://www.bleepingcomputer.com/news/security/mimecast-links-security-breach-to-solarwinds-hackers/\r\nPage 4 of 4",
	"extraction_quality": 1,
	"language": "EN",
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		"https://www.bleepingcomputer.com/news/security/mimecast-links-security-breach-to-solarwinds-hackers/"
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