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netscrape_shell

YARA-2018-3628 Medium general Active

case113 - file netscrape-shell.php

netscrape_shell.yar Valid Syntax 
/*
   Yara Rule Set
   Author: Brian Laskowski
   Date: 2018-05-30
   Identifier: case113
   Reference: https://github.com/Hestat/lw-yara
*/

/* Rule Set ----------------------------------------------------------------- */

rule netscrape_shell {
   meta:
      description = "case113 - file netscrape-shell.php"
      author = "Brian Laskowski"
      reference = "https://github.com/Hestat/lw-yara"
      date = "2018-05-30"
      hash1 = "63e43355854f640a1f81033042162d356d4af8a6bf9d327e27c4ac8ce366f740"
   strings:
      $x1 = "$str = \"host='\" . $ip . \"' port='\" . $port . \"' user='\" . $login . \"' password='\" . $pass . \"' dbname=postgres\";" fullword ascii
      $x2 = "\"findconfig * files\" => \"find / -typef - name\\\"config*\\\"\", \"find config* files in current dir\" => \"find . -type f -na" ascii
      $x3 = "echo '<h1>Bruteforce</h1><div class=content><table><form method=post><tr><td><span>Type</span></td>' . '<td><select name=proto><" ascii
      $x4 = "if (is_file($_POST['p1'])) $m = array('View', 'Highlight', 'Download', 'Hexdump', 'Edit', 'Chmod', 'Rename', 'Touch');" fullword ascii
      $x5 = "if ($db->connect($_POST['sql_host'], $_POST['sql_login'], $_POST['sql_pass'], $_POST['sql_base'])) {" fullword ascii
      $x6 = "if (!isset($_COOKIE[md5($_SERVER['HTTP_HOST']) ]) || ($_COOKIE[md5($_SERVER['HTTP_HOST']) ] != $auth_pass)) wsoLogin();" fullword ascii
      $x7 = ". ' < td > < nobr > ' . substr(@php_uname(), 0, 120) . ' < ahref = \"' . $explink . '\"target = _blank > [exploit - db . co" fullword ascii
      $s8 = "die(\"<pre align=center><form method=post>Password: <input type=password name=pass><input type=submit value='>>'></form><" fullword ascii
      $s9 = "$db->connect($_POST['sql_host'], $_POST['sql_login'], $_POST['sql_pass'], $_POST['sql_base']);" fullword ascii
      $s10 = "if ($this->link = @pg_connect(\"host={$host[0]} port={$host[1]} user=$user password=$pass dbname=$dbname\")) return true;" fullword ascii
      $s11 = "foreach ($downloaders as $item) if (wsoWhich($item)) $temp[] = $item;" fullword ascii
      $s12 = "if (isset($_POST['pass']) && (md5($_POST['pass']) == $auth_pass)) WSOsetcookie(md5($_SERVER['HTTP_HOST']), $auth_pass);" fullword ascii
      $s13 = "$downloaders = array('wget', 'fetch', 'lynx', 'links', 'curl', 'get', 'lwp-mirror');" fullword ascii
      $s14 = "if (empty($_POST['ajax']) && !empty($_POST['p1'])) WSOsetcookie(md5($_SERVER['HTTP_HOST']) . 'ajax', 0);" fullword ascii
      $s15 = "$downloaders = array('wget', 'fetch', 'lynx', 'links', 'curl', 'get', 'l" fullword ascii
      $s16 = "$explink = 'http://exploit-db.com/search/?action=search&filter_description=';" fullword ascii
      $s17 = "wsoSecParam('Downloaders', implode(', ', $temp));" fullword ascii
      $s18 = "echo \"<html><head><meta http-equiv='Content-Type' content='text/html; charset=\" . $_POST['charset'] . \"'><title>\" . " fullword ascii
      $s19 = "echo '<h1>Execution PHP-code</h1><div class=content><form name=pf method=post on" fullword ascii
      $s20 = "if ($db->connect($_POST['sql_host'], $_POST['sql_login']" fullword ascii
   condition:
      ( uint16(0) == 0x7263 and
         filesize < 400KB and
         ( 1 of ($x*) and 4 of them )
      ) or ( all of them )
}

rule _infected_05_30_18_obfuscated_netscrape_shell {
   meta:
      description = "case113 - file -.php"
      author = "Brian Laskowski"
      reference = "https://github.com/Hestat/lw-yara"
      date = "2018-05-30"
      hash1 = "5c05b22d161a82c30f63426a6c161ddbbd47d7acf867e9c5958ccb682be5a720"
   strings:
      $s1 = "$c0000101101010001010101101111110110101010111111111110101010101sdc0s1dc0sd1c0s1dc0s1d0cs1d0cs1dcsdc1sdc1s0dc1sd0cs1dc0s1dcs1d1g0" ascii
      $s2 = "dyrUnWXdzU9Ml9J0jOvB2bxvXGQkadeufKUvqOFFl8fqEo2EqI2v3QYBVaiYoiCDsw7dHEcipftIeyUcmMs1R1k5Pnvhl757hM0fQdD/pjjyFTP2vuw8xLDtAVrGcpGn" ascii
      $s3 = "MahWyawtVOtzh7WH7J6x3QnQb87tiUV+BN+iXzx9VNn07OoG2hjgdqh6zphJ2mmaWj74OwMyyWZkNwhAM+u1s2sbPClE34JVH2cTh0/mocSBLLpeyeO5pFfQRLnwTQaa" ascii
      $s4 = "2DDsNfthY3Rx+U7W/NijJE6rXEWSER4jumqzPfMMbWavn+VCHod6jp8mx1iH+2/fn7csuf92I9tgetGwUiQRAKblyzS2Mnq+Bw97C4GN/hAd9nTql9HuNeQpfsgowZwr" ascii
      $s5 = "nalanBEDllYrCJFnN6uyubiHhnl9chV9IghzN3WKaPcQbGMB4n/h212Z4deGpm99F0y8e5E8gDpV+rxUOrbRaA8tqlaSZ9hiaP2pDfraOhbuUXlbJiC8SgAsYQQXxUIE" ascii
      $s6 = "8/DCcYoPDgPm0HHXwqAW6tMPP5hYaYl7wLjD2XlqFiRzlKNFEqNB4/Hj6KoRKuAdvGgpwkyrVDNT4l6CH5gjqNeKAVmI/6SW4rsFZn5zJ10+vNTWhcV3U1SjZh181JdQ" ascii
      $s7 = "KPrZEslUzhQ+rrX2E/k2zgqBBMPbavzCF05ZvGbnCVGe4q/p/OFgwbInGVBdo5PdmAxRhORkeAKAEjtXD5S0Jz6jXJnwFZV89GEjX5/68T0/F953Dui4F92mzbB/jcbm" ascii
      $s8 = "HjmG/Va7vEKHywKL+Bn46tywk/neL6spXKhWTDoUffFtQwGuRuN3hcGHDQas5/Gk1SbGRvKQo8eTipiGjrv1mygeFo3RDf0FmjhcHeh66TVNh1CrQYklWFs2wT4S4pTr" ascii
      $s9 = "cAQ5mEZIM+bn3jChEqvb0TlCWTvnvAdCW+QpMu26HdhZFux5cyFLV7u7OLggW9tewsEQlObf8uGvSQimTAYglHV98NaWoDLl/1OTQdMjXHT+qaNuNNTc2FSnkJxJePI6" ascii
      $s10 = "/* Smart Tools Shop v5*/" fullword ascii
   condition:
      ( uint16(0) == 0x3f3c and
         filesize < 80KB and
         ( all of them )
      ) or ( all of them )
}

/* Super Rules ------------------------------------------------------------- */

Rule Metadata

description
case113 - file netscrape-shell.php
author
Brian Laskowski
reference
https://github.com/Hestat/lw-yara
date
2018-05-30
hash1
63e43355854f640a1f81033042162d356d4af8a6bf9d327e27c4ac8ce366f740

String Definitions

{"name":"$x1","value":"\""}
{"name":"$str","value":"\\\"host='\\\" ."}
{"name":"$x2","value":"\"\\\"findconfig * files\\\" => \\\"find \/ -typef - name\\\\\\\"config*\\\\\\\"\\\", \\\"find config* files in current dir\\\" => \\\"find . -type f -na\" ascii"}
{"name":"$x3","value":"\"echo '<h1>Bruteforce<\/h1><div class=content><table><form method=post><tr><td><span>Type<\/span><\/td>' . '<td><select name=proto><\" ascii"}
{"name":"$x4","value":"\"if (is_file("}
{"name":"$m","value":"array('View', 'Highlight', 'Download', 'Hexdump', 'Edit', 'Chmod', 'Rename', 'Touch');\" fullword ascii"}
{"name":"$x5","value":"\"if ("}
{"name":"$x6","value":"\"if (!isset("}
{"name":"$x7","value":"\". ' < td > < nobr > ' . substr(@php_uname(), 0, 120) . ' < ahref = \\\"' ."}
{"name":"$s8","value":"\"die(\\\"<pre align=center><form method=post>Password: <input type=password name=pass><input type=submit value='>>'><\/form><\" fullword ascii"}
{"name":"$s9","value":"\""}
{"name":"$s10","value":"\"if ("}
{"name":"$s11","value":"\"foreach ("}
{"name":"$s12","value":"\"if (isset("}
{"name":"$s13","value":"\""}
{"name":"$downloaders","value":"array('wget', 'fetch', 'lynx', 'links', 'curl', 'get', 'lwp-mirror');\" fullword ascii"}
{"name":"$s14","value":"\"if (empty("}
{"name":"$s15","value":"\""}
{"name":"$downloaders","value":"array('wget', 'fetch', 'lynx', 'links', 'curl', 'get', 'l\" fullword ascii"}
{"name":"$s16","value":"\""}
{"name":"$explink","value":"'http:\/\/exploit-db.com\/search\/?action=search&filter_description=';\" fullword ascii"}
{"name":"$s17","value":"\"wsoSecParam('Downloaders', implode(', ',"}
{"name":"$s18","value":"\"echo \\\"<html><head><meta http-equiv='Content-Type' content='text\/html; charset=\\\" ."}
{"name":"$s19","value":"\"echo '<h1>Execution PHP-code<\/h1><div class=content><form name=pf method=post on\" fullword ascii"}
{"name":"$s20","value":"\"if ("}

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 netscrape_shell.yar /path/to/suspicious/file

# Scan a directory recursively
yara -r netscrape_shell.yar /path/to/directory/

# Scan with metadata output
yara -m netscrape_shell.yar target_file

# Scan process memory (Linux)
yara netscrape_shell.yar /proc/[pid]/exe

Integration Examples

Python (yara-python)

import yara
rules = yara.compile(filepath='netscrape_shell.yar')
matches = rules.match('/path/to/file')

ClamAV Integration

clamscan --yara-rules=netscrape_shell.yar /path/to/scan

Rule Information

YARA ID
YARA-2018-3628
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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