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Rewterz Threat Advisory – CVE-2021-40444 MSHTML Vulnerability Exploited in Spam Campaign

Severity

High

Analysis Summary

A malspam campaign targeting MSHTML remote code execution vulnerability is being exploited in the wild. Threat actors are dropping cobaltstrike payload to infiltrate and gain unauthorized access for their own gain which can lead to information theft. The vulnerability was previously exploited as well via by using specially-crafted Microsoft Office documents.

CVE-2021-40444

Microsoft Windows could allow a remote attacker to execute arbitrary code on the system, caused by a flaw in the MSHTML Platform. By persuading a victim to visit a specially crafted Web site, an attacker could exploit this vulnerability to execute arbitrary code on the system.

Impact

  • Remote code execution

Indicators of Compromise

Filename

EYWCET97LV2U[.]inf

  • invoice[.]docx

MD5

  • 95e86f13ad08cbf7653ca14ee01a9496
  • 936cad45145d0745ffde338ed6492615
  • 2c469ff3ad8e37b241bb44cd266356d8

SHA-256

  • 12735482351d0b7b5018f46f78b124c2c0c39a8a3479c44e73f646ce1bb49f95
  • dd088962eb9e2a6b6e10114d4aecad1b20ca033f6eba1308eb6c0fcd9905cbee
  • 8bd0c08fee9f0a70a085b9640f54efeef54304d5ab26645cc3d0b64d322db714

SHA1

  • ca9a468ca020b40cf3e4e9f82700ddd5d3426929
  • 5b9c8d450f9d6bb7cb8072a89a39fb276971612d
  • 49b289387c44a5d738aca7fb127fcfa85b16b6c1

URL

  • http[:]//tigerdrill[.]xyz/EYWCET97LV2U[.]html
  • http[:]//tigerdrill[.]xyz/EYWCET97LV2U[.]cab

Affected Vendors

  • Microsoft

Remediation

Users are advised to use Microsoft Automatic Update to apply the appropriate patch for your system, or the Microsoft Security Update Guide to search for available patches.

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2021-40444