cd00r can discover the IP for the network interface on the compromised device.3
tool
cd00r S1204
- Type
- malware
- Platform
- Network Devices
- Created
- 19 February 2025
- Last modified
- 15 April 2025
cd00r is an open-source backdoor for UNIX and UNIX-variant operating systems that was orginally released in 2000. cd00r source code is primarily based on a packet-capturing program as it utilizes a sniffer to listen for specific sequences of network traffic or "secret knock" before executing the attacker's code.[1][2]
4
TechniquesBottom 17%
5
Tactics41st pct
0
Threat groupsNone recorded
0
CampaignsNone recorded
Enterprise ATT&CK only. Any Mobile or ICS rows on the same ATT&CK page are not carried.
MITRE reference S1204
cd00r can use the libpcap library to monitor captured packets for specifc sequences.4
cd00r can monitor incoming C2 communications sent over TCP to the compromised host.56
cd00r can monitor for a single TCP-SYN packet to be sent in series to a configurable set of ports (200, 80, 22, 53 and 3 in the original code) before opening a port for communication.78
Standing S1204
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
Techniques4Bottom 17%
17th percentile · 83% of 825 ATT&CK software entries have more Enterprise techniques.
Tactics541st pct
41st percentile · 59% of 825 ATT&CK software entries have more tactics spanned.
Threat groups061% 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 / technique8.5medBottom 12%
12th percentile · 88% of 825 ATT&CK software entries have more detection rules per technique.
Tests / technique6.5med
Detection coverage S1204
42 distinct rules cover the 4 techniques recorded for this tool. 26 Sigma · 16 Splunk.
3 covered by at least one rule1 with no coverage42 distinct rules in total
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