Backdoor_WebShell_asp
YARA-2019-0033
High
general
Active
Detect ASPXSpy
Backdoor_WebShell_asp.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 Backdoor_WebShell_asp : ASPXSpy
{
meta:
description= "Detect ASPXSpy"
author = "xylitol@temari.fr"
date = "2019-02-26"
// May only the challenge guide you
strings:
$string1 = "CmdShell" wide ascii
$string2 = "ADSViewer" wide ascii
$string3 = "ASPXSpy.Bin" wide ascii
$string4 = "PortScan" wide ascii
$plugin = "Test.AspxSpyPlugins" wide ascii
condition:
3 of ($string*) or $plugin
}
Rule Metadata
description
Detect ASPXSpy
author
xylitol@temari.fr
date
2019-02-26
Tags
ASPXSpy
String Definitions
{"name":"$string1","value":"\"CmdShell\" wide ascii"}
{"name":"$string2","value":"\"ADSViewer\" wide ascii"}
{"name":"$string3","value":"\"ASPXSpy.Bin\" wide ascii"}
{"name":"$string4","value":"\"PortScan\" wide ascii"}
{"name":"$plugin","value":"\"Test.AspxSpyPlugins\" wide 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 Backdoor_WebShell_asp.yar /path/to/suspicious/file # Scan a directory recursively yara -r Backdoor_WebShell_asp.yar /path/to/directory/ # Scan with metadata output yara -m Backdoor_WebShell_asp.yar target_file # Scan process memory (Linux) yara Backdoor_WebShell_asp.yar /proc/[pid]/exe
Integration Examples
Python (yara-python)
import yara
rules = yara.compile(filepath='Backdoor_WebShell_asp.yar')
matches = rules.match('/path/to/file')
ClamAV Integration
clamscan --yara-rules=Backdoor_WebShell_asp.yar /path/to/scan
Rule Information
YARA ID
YARA-2019-0033
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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