MOPSLED can encrypt configuration files with a custom ChaCha20 algorithm.2
tool
MOPSLED S1221
- Type
- malware
- Platform
- Linux
- Created
- 11 June 2025
- Last modified
- 11 June 2025
MOPSLED is a shellcode-based modular backdoor that has been used by China-nexus cyber espionage actors including UNC3886 and APT41.[1]
6
Techniques29th pct
2
TacticsBottom 12%
2
Threat groupsunranked
0
CampaignsNone recorded
Enterprise ATT&CK only. Any Mobile or ICS rows on the same ATT&CK page are not carried.
MITRE reference S1221
Standing S1221
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
Techniques629th pct
29th percentile · 71% of 825 ATT&CK software entries have more Enterprise techniques.
Tactics2Bottom 12%
12th percentile · 88% of 825 ATT&CK software entries have more tactics spanned.
Threat groups261% 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 / technique11medBottom 18%
18th percentile · 82% of 825 ATT&CK software entries have more detection rules per technique.
Tests / technique3med
Detection coverage S1221
100 distinct rules cover the 6 techniques recorded for this tool. The 104 technique-to-rule mappings resolve to 100 distinct rules, because one rule can cover several techniques. 76 Sigma · 24 Splunk.
6 covered by at least one rule100 distinct rules in total
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