custom_ssh_backdoor_server
YARA-2015-0031
High
general
Active
Custome SSH backdoor based on python and paramiko - file server.py
custom_ssh_backdoor_server.yar
Valid Syntax
/*
This Yara ruleset is under the GNU-GPLv2 license (http://www.gnu.org/licenses/gpl-2.0.html) and open to any user or organization, as long as you use it under this license.
*/
rule custom_ssh_backdoor_server
{
meta:
description = "Custome SSH backdoor based on python and paramiko - file server.py"
author = "Florian Roth"
reference = "https://goo.gl/S46L3o"
date = "2015-05-14"
hash = "0953b6c2181249b94282ca5736471f85d80d41c9"
strings:
$s0 = "command= raw_input(\"Enter command: \").strip('n')" fullword ascii
$s1 = "print '[-] (Failed to load moduli -- gex will be unsupported.)'" fullword ascii
$s2 = "print '[-] Listen/bind/accept failed: ' + str(e)" fullword ascii
$s3 = "chan.send(command)" fullword ascii
$s4 = "print '[-] SSH negotiation failed.'" fullword ascii
$s5 = "except paramiko.SSHException, x:" fullword ascii
condition:
filesize < 10KB and 5 of them
}
Rule Metadata
description
Custome SSH backdoor based on python and paramiko - file server.py
author
Florian Roth
reference
https://goo.gl/S46L3o
date
2015-05-14
hash
0953b6c2181249b94282ca5736471f85d80d41c9
String Definitions
{"name":"$s0","value":"\"command= raw_input(\\\"Enter command: \\\").strip('n')\" fullword ascii"}
{"name":"$s1","value":"\"print '[-] (Failed to load moduli -- gex will be unsupported.)'\" fullword ascii"}
{"name":"$s2","value":"\"print '[-] Listen\/bind\/accept failed: ' + str(e)\" fullword ascii"}
{"name":"$s3","value":"\"chan.send(command)\" fullword ascii"}
{"name":"$s4","value":"\"print '[-] SSH negotiation failed.'\" fullword ascii"}
{"name":"$s5","value":"\"except paramiko.SSHException, x:\" fullword ascii"}
Threat Analysis
This YARA rule is designed to detect general threats.
Severity Level: High
The rule uses pattern matching to identify specific byte sequences, strings, or behavioral patterns associated with malicious activity.
Detection Capabilities
- File-based detection for executables and documents
- Memory scanning for running processes
- Network traffic analysis support
Command Line Usage
# Scan a single file yara custom_ssh_backdoor_server.yar /path/to/suspicious/file # Scan a directory recursively yara -r custom_ssh_backdoor_server.yar /path/to/directory/ # Scan with metadata output yara -m custom_ssh_backdoor_server.yar target_file # Scan process memory (Linux) yara custom_ssh_backdoor_server.yar /proc/[pid]/exe
Integration Examples
Python (yara-python)
import yara
rules = yara.compile(filepath='custom_ssh_backdoor_server.yar')
matches = rules.match('/path/to/file')
ClamAV Integration
clamscan --yara-rules=custom_ssh_backdoor_server.yar /path/to/scan
Rule Information
YARA ID
YARA-2015-0031
Author
Repository
Created
August 19, 2025
Last Updated
August 19, 2025
Last Imported
Never
Threat Intelligence
Risk Level
High
Category
general
Detection Confidence
Analysis Pending
False Positive Rate
Not Available
Last Seen in Wild
No Data
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