Ebury has implemented a fallback mechanism to begin using a DGA when the attacker hasn't connected to the infected system for three days.5
tool
Ebury S0377
- Type
- malware
- Platform
- Linux
- Created
- 19 April 2019
- Last modified
- 20 September 2024
Ebury is an OpenSSH backdoor and credential stealer targeting Linux servers and container hosts developed by Windigo. Ebury is primarily installed through modifying shared libraries (.so files) executed by the legitimate OpenSSH program. First seen in 2009, Ebury has been used to maintain a botnet of servers, deploy additional malware, and steal cryptocurrency wallets, credentials, and credit card details.[1][2][3][4]
21
TechniquesTop 18%
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 S0377
If credentials are not collected for two weeks, Ebury encrypts the credentials using a public key and sends them via UDP to an IP address located in the DNS TXT record.89
Ebury has obfuscated its strings with a simple XOR encryption with a static key.10
Ebury exfiltrates a list of outbound and inbound SSH sessions using OpenSSH's known_host files and wtmp records. Ebury can exfiltrate SSH credentials through custom DNS queries or use the command Xcat to send the process's ssh session's credentials to the C2 server.1112
Ebury can use the commands Xcsh or Xcls to open a shell with Ebury level permissions and Xxsh to open a shell with root level.13
Standing S0377
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
Techniques21Top 18%
82nd percentile · 82% of 825 ATT&CK software entries have this many Enterprise techniques or fewer.
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 / technique10medBottom 15%
15th percentile · 85% of 825 ATT&CK software entries have more detection rules per technique.
Tests / technique3med
Detection coverage S0377
610 distinct rules cover the 21 techniques recorded for this tool. The 621 technique-to-rule mappings resolve to 610 distinct rules, because one rule can cover several techniques. 394 Sigma · 216 Splunk.
19 covered by at least one rule2 with no coverage610 distinct rules in total
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