tool
Kessel S0487
- Type
- malware
- Platform
- Linux
- Created
- 16 July 2020
- Last modified
- 11 April 2024
Kessel is an advanced version of OpenSSH which acts as a custom backdoor, mainly acting to steal credentials and function as a bot. Kessel has been active since its C2 domain began resolving in August 2018.[1]
Enterprise ATT&CK only. Any Mobile or ICS rows on the same ATT&CK page are not carried.
MITRE reference S0487
Kessel's configuration is hardcoded and RC4 encrypted within the binary.3
Kessel can split the data to be exilftrated into chunks that will fit in subdomains of DNS queries.4
Kessel has exfiltrated information gathered from the infected system to the C2 server.5
Kessel can exfiltrate credentials and other information via HTTP POST request, TCP, and DNS.6
Kessel can create a reverse shell between the infected host and a specified system.7
Standing S0487
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
61st percentile · 61% of 825 ATT&CK software entries have this many Enterprise techniques or fewer.
89th percentile · 89% 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
55th percentile · 55% of 825 ATT&CK software entries have this many detection rules per technique or fewer.
Detection coverage S0487
483 distinct rules cover the 14 techniques recorded for this tool. The 502 technique-to-rule mappings resolve to 483 distinct rules, because one rule can cover several techniques. 320 Sigma · 163 Splunk.
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