UPSTYLE retrieves a non-existent webpage from the command and control server then parses commands from the resulting error logs to decode commands to the web shell.3
tool
UPSTYLE S1164
- Type
- malware
- Platforms
- Network Devices, Linux
- Created
- 20 November 2024
- Last modified
- 15 April 2025
UPSTYLE is a Python-based backdoor associated with exploitation of Palo Alto firewalls using CVE-2024-3400 in early 2024. UPSTYLE has only been observed in relation to this exploitation activity, which involved attempted install on compromised devices by the threat actor UTA0218.[1][2]
12
Techniques54th pct
7
Tactics68th pct
0
Threat groupsNone recorded
1
Campaignunranked
Enterprise ATT&CK only. Any Mobile or ICS rows on the same ATT&CK page are not carried.
MITRE reference S1164
Standing S1164
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
Techniques1254th pct
54th percentile · 54% of 825 ATT&CK software entries have this many Enterprise techniques or fewer.
Tactics768th pct
68th percentile · 68% of 825 ATT&CK software entries have this many tactics spanned or fewer.
Threat groups061% 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 / technique8.5medBottom 12%
12th percentile · 88% of 825 ATT&CK software entries have more detection rules per technique.
Tests / technique6.5med
Detection coverage S1164
156 distinct rules cover the 12 techniques recorded for this tool. 117 Sigma · 39 Splunk.
10 covered by at least one rule2 with no coverage156 distinct rules in total
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