tool
Crutch S0538
- Type
- malware
- Platform
- Windows
- Created
- 4 December 2020
- Last modified
- 25 April 2025
Crutch is a backdoor designed for document theft that has been used by Turla since at least 2015.[1]
Enterprise ATT&CK only. Any Mobile or ICS rows on the same ATT&CK page are not carried.
MITRE reference S0538
Crutch has used a hardcoded GitHub repository as a fallback channel.3
Crutch has automatically exfiltrated stolen files to Dropbox.4
Crutch can monitor removable drives and exfiltrate files matching a given extension list.5
Crutch has established persistence with a scheduled task impersonating the Outlook item finder.6
Crutch can exfiltrate data over the primary C2 channel (Dropbox HTTP API).7
Standing S0538
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
29th percentile · 71% of 825 ATT&CK software entries have more detection rules per technique.
Detection coverage S0538
364 distinct rules cover the 15 techniques recorded for this tool. The 378 technique-to-rule mappings resolve to 364 distinct rules, because one rule can cover several techniques. 267 Sigma · 97 Splunk.
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