tool
PHASEJAM S9014
- Type
- malware
- Platforms
- Linux, Network Devices
- Created
- 16 April 2026
- Last modified
- 12 May 2026
PHASEJAM is a dropper written as a bash shell script that modifies Ivanti Connect Secure appliance components. PHASEJAM was first reported in January 2025. PHASEJAM has previously been leveraged by People's Republic of China (PRC)- affiliated actors identified as UNC5221 and SYLVANITE.[1][2]
Enterprise ATT&CK only. Any Mobile or ICS rows on the same ATT&CK page are not carried.
MITRE reference S9014
PHASEJAM has launched a webshell using the MIME::Base64 module that encoded and decoded Base64 commands.4
PHASEJAM has renamed the file /home/bin/remotedebug to remotedebug.bak, allowing the threats actors to write a malicious /home/bin/remotedebug shell script.5
PHASEJAM has the ability to exfiltrate data from the victim appliance.6
PHASEJAM has leveraged native commands associated with the compromised network appliance to execute code.7
PHASEJAM has the ability to upload files onto the compromised appliance.8
Standing S9014
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
66th percentile · 66% of 825 ATT&CK software entries have this many Enterprise techniques or fewer.
80th percentile · 80% of 825 ATT&CK software entries have this many tactics spanned or fewer.
61% of the population shares a single value across only 22 distinct values, so a percentile here would rank the tie, not the entity.
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
21st percentile · 79% of 825 ATT&CK software entries have more detection rules per technique.
Detection coverage S9014
603 distinct rules cover the 15 techniques recorded for this tool. The 611 technique-to-rule mappings resolve to 603 distinct rules, because one rule can cover several techniques. 372 Sigma · 231 Splunk.
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