VersaMem encrypted captured credentials with AES then Base64 encoded them before writing to local storage.2
tool
VersaMem S1154
- Type
- malware
- Platform
- Network Devices
- Created
- 27 August 2024
- Last modified
- 15 April 2025
VersaMem is a web shell designed for deployment to Versa Director servers following exploitation. Discovered in August 2024, VersaMem was used during Versa Director Zero Day Exploitation by Volt Typhoon to target ISPs and MSPs. VersaMem is deployed as a Java Archive (JAR) and allows for credential capture for Versa Director logon activity as well as follow-on execution of arbitrary Java payloads.[1]
8
Techniques38th pct
5
Tactics41st pct
1
Threat groupunranked
1
Campaignunranked
Enterprise ATT&CK only. Any Mobile or ICS rows on the same ATT&CK page are not carried.
MITRE reference S1154
VersaMem hooked the Catalina application filter chain doFilter on compromised systems to monitor all inbound requests to the local Tomcat web server, inspecting them for parameters like passwords and follow-on Java modules.3
VersaMem hooked and overrided Versa's built-in authentication method, setUserPassword, to intercept plaintext credentials when submitted to the server.4
VersaMem was delivered as a Java Archive (JAR) that runs by attaching itself to the Apache Tomcat Java servlet and web server.5
VersaMem deleted files related to initial installation such as temporary files related to the PID of the main web process.6
VersaMem staged captured credentials locally at /tmp/.temp.data.7
Standing S1154
Reach is how much of ATT&CK this tool 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 825 ATT&CK software entries 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
Techniques838th pct
38th percentile · 62% of 825 ATT&CK software entries have more Enterprise techniques.
Tactics541st pct
41st percentile · 59% of 825 ATT&CK software entries have more tactics spanned.
Threat group161% tie · 22 values
61% of the population shares a single value across only 22 distinct values, so a percentile here would rank the tie, not the entity.
Campaign185% tie · 8 values
85% of the population shares a single value across only 8 distinct values, so a percentile here would rank the tie, not the entity.
Coverage
Rules / technique10medBottom 15%
15th percentile · 85% of 825 ATT&CK software entries have more detection rules per technique.
Tests / technique2med
Detection coverage S1154
239 distinct rules cover the 8 techniques recorded for this tool. The 248 technique-to-rule mappings resolve to 239 distinct rules, because one rule can cover several techniques. 160 Sigma · 79 Splunk.
7 covered by at least one rule1 with no coverage239 distinct rules in total
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