frack113
31 lines
890 B
YAML
31 lines
890 B
YAML
title: Suspicious Use of /dev/tcp
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id: 6cc5fceb-9a71-4c23-aeeb-963abe0b279c
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status: experimental
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description: Detects suspicious command with /dev/tcp
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author: frack113
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references:
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- https://www.andreafortuna.org/2021/03/06/some-useful-tips-about-dev-tcp/
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- https://book.hacktricks.xyz/shells/shells/linux
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- https://github.com/redcanaryco/atomic-red-team/blob/master/atomics/T1046/T1046.md#atomic-test-1---port-scan
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date: 2021/12/10
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logsource:
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product: linux
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detection:
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keyword:
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- "cat </dev/tcp/"
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- "exec 3<>/dev/tcp/"
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- "echo >/dev/tcp/"
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- "bash -i >& /dev/tcp/"
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- "sh -i >& /dev/udp/"
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- "0<&196;exec 196<>/dev/tcp/"
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- "exec 5<>/dev/tcp/"
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- "(sh)0>/dev/tcp/"
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- "bash -c 'bash -i >& /dev/tcp/"
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- "echo -e '#!/bin/bash\nbash -i >& /dev/tcp/"
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condition: 1 of keyword
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falsepositives:
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- Unknown
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level: medium
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tags:
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- attack.reconnaissance
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