infected_08_26_18_shell_fun
YARA-2018-3632
Medium
general
Active
shell2 - file fun.php
infected_08_26_18_shell_fun.yar
Valid Syntax
/*
Yara Rule Set
Author: Brian Laskowski
Date: 2018-08-26
Identifier: shell2
Reference: https://github.com/Hestat/lw-yara/
*/
/* Rule Set ----------------------------------------------------------------- */
rule infected_08_26_18_shell_fun {
meta:
description = "shell2 - file fun.php"
author = "Brian Laskowski"
reference = "https://github.com/Hestat/lw-yara/"
date = "2018-08-26"
hash1 = "9d095e4f6a3f37c46a1aac4704da957c92fbde23feea3cfd1a0693522e3a73a8"
strings:
$s1 = "<?php /* Only For NassRawi , X-SHADOW" fullword ascii
$s2 = "$OOO000000=urldeCode('" fullword ascii
condition:
( uint16(0) == 0x3f3c and
filesize < 50KB and
( all of them )
) or ( all of them )
}
Rule Metadata
description
shell2 - file fun.php
author
Brian Laskowski
reference
https://github.com/Hestat/lw-yara/
date
2018-08-26
hash1
9d095e4f6a3f37c46a1aac4704da957c92fbde23feea3cfd1a0693522e3a73a8
String Definitions
{"name":"$s1","value":"\"<?php \/* Only For NassRawi , X-SHADOW\" fullword ascii"}
{"name":"$s2","value":"\""}
{"name":"$OOO000000","value":"urldeCode('\" fullword ascii"}
Threat Analysis
This YARA rule is designed to detect general threats.
Severity Level: Medium
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 infected_08_26_18_shell_fun.yar /path/to/suspicious/file # Scan a directory recursively yara -r infected_08_26_18_shell_fun.yar /path/to/directory/ # Scan with metadata output yara -m infected_08_26_18_shell_fun.yar target_file # Scan process memory (Linux) yara infected_08_26_18_shell_fun.yar /proc/[pid]/exe
Integration Examples
Python (yara-python)
import yara
rules = yara.compile(filepath='infected_08_26_18_shell_fun.yar')
matches = rules.match('/path/to/file')
ClamAV Integration
clamscan --yara-rules=infected_08_26_18_shell_fun.yar /path/to/scan
Rule Information
YARA ID
YARA-2018-3632
Author
Repository
Created
August 19, 2025
Last Updated
August 19, 2025
Last Imported
Never
Threat Intelligence
Risk Level
Medium
Category
general
Detection Confidence
Analysis Pending
False Positive Rate
Not Available
Last Seen in Wild
No Data
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