tool
DCSrv S1033
- Type
- malware
- Platform
- Windows
- Created
- 11 August 2022
- Last modified
- 11 April 2024
DCSrv is destructive malware that has been used by Moses Staff since at least September 2021. Though DCSrv has ransomware-like capabilities, Moses Staff does not demand ransom or offer a decryption key.[1]
Enterprise ATT&CK only. Any Mobile or ICS rows on the same ATT&CK page are not carried.
MITRE reference S1033
DCSrv has masqueraded its service as a legitimate svchost.exe process.3
DCSrv has used various Windows API functions, including DeviceIoControl, as part of its encryption process.4
DCSrv can compare the current time on an infected host with a configuration value to determine when to start the encryption process.6
DCSrv has encrypted drives using the core encryption mechanism from DiskCryptor.7
Standing S1033
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
38th percentile · 62% of 825 ATT&CK software entries have more Enterprise techniques.
68th percentile · 68% 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
34th percentile · 66% of 825 ATT&CK software entries have more detection rules per technique.
Detection coverage S1033
310 distinct rules cover the 8 techniques recorded for this tool. The 314 technique-to-rule mappings resolve to 310 distinct rules, because one rule can cover several techniques. 188 Sigma · 122 Splunk.
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