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SEKOIA_Tool_Generic_Python_Reverse_Shell_Strings

Detects reverse shell

Hack toolSEKOIA.IO CommunityDetection Rule License 1.1Compiles with YARA-X
Author
Sekoia.io
Date
2024-04-16
Modified
2024-12-19
Score / Quality
75 / 80

What this rule detects

Detects reverse shell

It defines 2 patterns (2 text, 0 hex, 0 regex).

Summary generated from the rule's metadata and condition.

Rule source

tool-generic-python-reverse-shell-strings.yarDetection Rule License 1.1
rule SEKOIA_Tool_Generic_Python_Reverse_Shell_Strings : FILE
{
	meta:
		description = "Detects reverse shell"
		author = "Sekoia.io"
		id = "5b926d15-4f21-428c-a9fa-ee085a98d42b"
		date = "2024-04-16"
		modified = "2024-12-19"
		reference = "https://github.com/SEKOIA-IO/Community"
		source_url = "https://github.com/SEKOIA-IO/Community/blob/a438a5901a211c2abdf75da9c93921ef187473d1/yara_rules/tool_generic_python_reverse_shell_strings.yar#L1-L16"
		license_url = "https://github.com/SEKOIA-IO/Community/blob/a438a5901a211c2abdf75da9c93921ef187473d1/LICENSE.md"
		logic_hash = "bb4fcef595f4be035815f536786987ac1343727f16c0560a1cb593e854ba8f17"
		score = 75
		quality = 80
		tags = "FILE"
		version = "1.0"
		classification = "TLP:CLEAR"

	strings:
		$ = "import sys,socket,os,pty;"
		$ = "[os.dup2(s.fileno(),fd) for fd in (0,1,2)]"

	condition:
		all of them and filesize < 1000
}

Strings (2 patterns)

IdentifierTypeValueModifiers
$text"import sys,socket,os,pty;"
$text"[os.dup2(s.fileno(),fd) for fd in (0,1,2)]"

Condition

all of them and filesize < 1000

In plain words (Heuristic)

  • The file must be smaller than 1000 (a cheap guard that skips large files).
  • All patterns in the rule must match.

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References

Licence & attribution

Author: Sekoia.io

Source repository: SEKOIA.IO Community @ a438a5901a

Licence: Detection Rule License 1.1 (repository licence)

Original rule

Mirrored via YARA Forge 20260927, which prefixes rule names with the source and adds normalised meta fields.

Rule id: 5b926d15-4f21-428c-a9fa-ee085a98d42b

Metadata

version1.0
classificationTLP:CLEAR

Tags:FILE