Versa Director Zero Day Exploitation was conducted by Volt Typhoon from early June through August 2024 as zero-day exploitation of Versa Director servers controlling software-defined wide area network (SD-WAN) applications. Since tracked as CVE-2024-39717, exploitation focused on credential capture from compromised Versa Director servers at managed service providers (MSPs) and internet service providers (ISPs) to enable follow-on access to service provider clients. Versa Director Zero Day Exploitation was followed by the delivery of the VersaMem web shell for both credential theft and follow-on code execution.[1]
8
TechniquesBottom 21%
6
Tactics34th pct
1
Tool or malware45th pct
1
Threat groupunranked
Enterprise ATT&CK only. Any Mobile or ICS rows on the same ATT&CK page are not carried.
Versa Director Zero Day Exploitation MITRE reference C0039
Versa Director Zero Day Exploitation established HTTPS communications from adversary-controlled SOHO devices over port 443 with compromised Versa Director servers.3
Versa Director Zero Day Exploitation involved exploitation of a vulnerability in Versa Director servers, since identified as CVE-2024-39717, for initial access and code execution.5
Reach is how much of ATT&CK this campaign touches. Coverage is how well defended each thing it does is, as a median per technique rather than a total — a total would just restate the reach. Each figure is ranked against all 56 ATT&CK campaigns only where that population actually spreads. Where most of the population shares one value, a percentile would rank the tie instead of the entity, so the raw value is shown and no rank is claimed.
Reach
Techniques8Bottom 21%
21st percentile · 79% of 56 ATT&CK campaigns have more Enterprise techniques.
Tactics634th pct
34th percentile · 66% of 56 ATT&CK campaigns have more tactics spanned.
Tool or malware145th pct
45th percentile · 55% of 56 ATT&CK campaigns have more tools and malware.
Threat group155% tie · 3 values
55% of the population shares a single value across only 3 distinct values, so a percentile here would rank the tie, not the entity.
Coverage
Rules / technique8.5medBottom 20%
20th percentile · 80% of 56 ATT&CK campaigns have more detection rules per technique.
Tests / technique0medBottom 23%
23rd percentile · 77% of 56 ATT&CK campaigns have more atomic tests per technique.
Data comps / technique5med43% tie · 7 values
43% of the population shares a single value across only 7 distinct values, so a percentile here would rank the tie, not the entity.
Mitigations / technique2medTop 16%
84th percentile · 84% of 56 ATT&CK campaigns have this many mitigations per technique or fewer.
6 of 8 axes carry an honest rank on this page. Coverage medians are taken across this campaign’s 8 Enterprise techniques.
Range
Technique Campaign use over its cumulative rule count.
Versa Director Zero Day Exploitation detections C0039
368 distinct rules cover the 8 techniques recorded for this campaign. 234 Sigma · 134 Splunk.
7 covered by at least one rule1 with no coverage368 distinct rules in total
Showing 1-50 of 300+ rules
Drag headers to reorder | Drag edges to resize
Select
Title
Description
Category
Status
Event
OS
Product
MITRE ATT&CK
CVEs
Severity
Author
Created
Updated
ID
Refs
Splunk
The following analytic identifies access to the /api/v1/configuration/users/user-roles/user-role/rest-userrole1/web/web-bookmarks/bookmark endpoint, which is associated with CVE-2023-46805 and CVE-2024-21887 vulnerabilities. (...)
The following analytic detects potential exploitation of the Adobe ColdFusion vulnerability, CVE-2023-26360, which allows unauthenticated arbitrary file read. (...)
Adversaries may communicate using application layer protocols associated with web traffic to avoid detection/network filtering by blending in with existing traffic. (...)
This analytic detects the usage of the Utility osascript on a macOS device initiated a network connection lasting longer than 10 minutes (600 seconds). (...)
This analytic detects unexpected outbound network connections initiated by known webserver processes such as `httpd.exe`, `nginx.exe`, or `tomcat.exe` to common file sharing or public content hosting services like GitHub, Discord CDN, Transfer.sh, or Pastebin. (...)
The following analytic detects the use of known suspicious SSL certificates in any observed event where the SSL_CertFingerprint field is present. (...)
The following analytic detects connections with a high Encrypted Visibility Engine (EVE) threat confidence score, indicating potentially malicious behavior within encrypted traffic. (...)
This correlation rule identifies potential exploitation attempts of Oracle E-Business Suite vulnerabilities (CVE-2025-61882 and CVE-2025-61884) by correlating multiple intrusion signatures from Cisco Secure Firewall Threat Defense logs. (...)
This analytic detects vulnerability exploitation and post-compromise activity associated with Oracle E-Business Suite web-application vulnerabilities, CVE-2025-61882 and CVE-2025-61884. (...)
This analytic detects HTTP requests to privileged execution paths on Cisco routers, specifically targeting the `/level/15/exec/-/*` endpoint using Cisco Secure Firewall Intrusion Events. (...)