CASTLETAP can execute a C2 command to transfer files from victim machines.2
tool
CASTLETAP S1224
- Type
- malware
- Platform
- Network Devices
- Created
- 16 June 2025
- Last modified
- 16 June 2025
CASTLETAP is an ICMP port knocking backdoor that has been installed on compromised FortiGate firewalls by UNC3886.[1]
8
Techniques38th pct
7
Tactics68th pct
1
Threat groupunranked
0
CampaignsNone recorded
Enterprise ATT&CK only. Any Mobile or ICS rows on the same ATT&CK page are not carried.
MITRE reference S1224
CASTLETAP has the ability to create a raw promiscuous socket to sniff network traffic.3
CASTLETAP has the ability to spawn BusyBox command shell in victim environments.4
CASTLETAP can transfer files to compromised network devices.5
CASTLETAP can filter and deobfuscate an XOR encrypted activation string in the payload of an ICMP echo request.6
CASTLETAP can listen for a specialized ICMP packet for activation on compromised network devices.7
Standing S1224
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.
Tactics768th pct
68th percentile · 68% of 825 ATT&CK software entries have this many tactics spanned or fewer.
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.
Campaigns085% 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 / technique16med38th pct
38th percentile · 62% of 825 ATT&CK software entries have more detection rules per technique.
Tests / technique7med
Detection coverage S1224
214 distinct rules cover the 8 techniques recorded for this tool. The 218 technique-to-rule mappings resolve to 214 distinct rules, because one rule can cover several techniques. 145 Sigma · 69 Splunk.
6 covered by at least one rule2 with no coverage214 distinct rules in total
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