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Description

This detection identifies attempts to authenticate with an empty public key fingerprint in Progress MOVEit Transfer, which is a key indicator of potential exploitation of the CVE-2024-5806 vulnerability. Such attempts are characteristic of the authentication bypass technique used in this vulnerability, where attackers try to impersonate valid users without providing proper credentials. While occasional empty key fingerprint authentication attempts might occur due to misconfigurations, a sudden increase or attempts from unexpected sources could signify malicious activity. This analytic helps security teams identify and investigate potential exploitation attempts of the MOVEit Transfer authentication bypass vulnerability.

  • Type: Hunting

  • Product: Splunk Enterprise, Splunk Enterprise Security, Splunk Cloud

  • Last Updated: 2024-07-24
  • Author: Michael Haag, Splunk
  • ID: 1a537acc-199f-4713-b5d7-3d98c05ab932

Annotations

ATT&CK

ATT&CK

ID Technique Tactic
T1190 Exploit Public-Facing Application Initial Access
Kill Chain Phase
  • Delivery
NIST
  • DE.AE
CIS20
  • CIS 10
CVE 


1
2
3
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5



`moveit_sftp_logs` "UserAuthRequestHandler: SftpPublicKeyAuthenticator: Attempted to authenticate empty public key fingerprint" 
| stats count by source _raw 
| `security_content_ctime(firstTime)` 
| `security_content_ctime(lastTime)` 
| `moveit_empty_key_fingerprint_authentication_attempt_filter`

Macros

The SPL above uses the following Macros:

:information_source: moveit_empty_key_fingerprint_authentication_attempt_filter is a empty macro by default. It allows the user to filter out any results (false positives) without editing the SPL.

Required fields

List of fields required to use this analytic.

  • source
  • _raw

How To Implement

The MOVEit logs must be collected in Splunk. Currently, there is no TA available for MOVEit. Modify the analytic as needed to match the log format of your environment.

Known False Positives

False positives may occur, therefore utilize the analytic as a jump off point to identify potential empty key fingerprint authentication attempts.

Associated Analytic Story

RBA

Risk Score Impact Confidence Message
9.0 30 30 Potential exploitation of the CVE-2024-5806 vulnerability in Progress MOVEit Transfer, causing empty key fingerprint authentication attempts via $source$.

:information_source: The Risk Score is calculated by the following formula: Risk Score = (Impact * Confidence/100). Initial Confidence and Impact is set by the analytic author.

Reference

Test Dataset

Replay any dataset to Splunk Enterprise by using our replay.py tool or the UI. Alternatively you can replay a dataset into a Splunk Attack Range

source | version: 1