GreyNoise recommends reviewing systems for any indicators of unauthorized access that may have occurred within the past 90 days.

On May 31st, 2023 Progress issued a security notice to users of MOVEit Transfer regarding a vulnerability that allows for escalated privileges and potential unauthorized access to the environment. CVE-2023-34362 was assigned to this vulnerability on June 2, 2023. MOVEIT transfer tag can be viewed here.

Progress’ security notice is advising users to review their system for unauthorized access for “at least the past 30 days”, however, GreyNoise has observed scanning activity for the login page of MOVEit Transfer located at /human.aspx as early as March 3rd, 2023. While we have not observed activity directly related to exploitation, all of the 5 IPs we have observed attempting to discover the location of MOVEit installations were marked as “Malicious” by GreyNoise for prior activities.

Based on the scanning activity we have observed, it is our recommendation that users of MOVEit Transfer should extend the time window for their review of potentially malicious activity to at least 90 days.

The primary artifact, observed through publicly available information, is the presence of a webshell named human2.aspx. This is a post-exploitation file artifact that is written to the filesystem by a malicious actor allowing them to execute arbitrary commands.

GreyNoise is observing scanning activity looking to identify the presence of the human2.aspx webshell dropped as part of the post-exploitation activity.

While the specific details of the initial exploitation vector are largely unknown at this time, we would like to provide the following items and details to our customers and community:

  • Several cybersecurity vendors are covering the subject including Rapid7 and TrustedSec
  • Rapid7 is indicating the initial vector may be a SQL injection vulnerability leading to remote code execution (SQLi-to-RCE)
  • Progress MOVEit Transfer is deployed with a Microsoft SQL (MSSQL) or My SQL (MYSQL) backing database
  • The login page of Progress MOVEit Transfer is located at /human.aspx
  • Common paths to achieve remote code execution through SQL injection include the usage of the following T-SQL commands:
  • xp_cmdshell
  • sp_OACreate
  • sp_OAMethod

Last but not least, a big thank you to the GreyNoise community for alerting us to this activity early on.

This article is a summary of the full, in-depth version on the GreyNoise Labs blog.
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