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infected_08_22_18_admin_backdoor_pomo

YARA-2018-3685 High general Active

shell5 - file pomo.php3

infected_08_22_18_admin_backdoor_pomo.yar Valid Syntax 
/*
   Yara Rule Set
   Author: Brian Laskowski
   Date: 2018-08-23
   Identifier: shell5
   Reference: https://github.com/Hestat/lw-yara/
*/

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

rule infected_08_22_18_admin_backdoor_pomo {
   meta:
      description = "shell5 - file pomo.php3"
      author = "Brian Laskowski"
      reference = "https://github.com/Hestat/lw-yara/"
      date = "2018-08-23"
      hash1 = "6f986483b7dbfb173bb3744c19a839d793dd53248e09b9da63906f9e3e1fbb7b"
   strings:
      $s1 = "wp_redirect(get_bloginfo('wpurl') . '/wp-admin');" fullword ascii
      $s2 = "wp_set_current_user($user_id, $user_login);" fullword ascii
      $s3 = "echo \"You are logged in as $user_login\";" fullword ascii
      $s4 = "do_action('wp_login', $user_login);" fullword ascii
      $s5 = "$user_login = $user_info->user_login;" fullword ascii
      $s6 = "$user_ids = $wpdb->get_results($query_str);" fullword ascii
      $s7 = "$query_str = \"SELECT ID FROM $wpdb->users\";" fullword ascii
      $s8 = "require('../../wp-blog-header.php');" fullword ascii
      $s9 = "$user_info = get_userdata($user_id);" fullword ascii
      $s10 = "if (function_exists('get_admin_url')) {" fullword ascii
      $s11 = "wp_redirect(get_admin_url());" fullword ascii
   condition:
      ( uint16(0) == 0x3f3c and
         filesize < 2KB and
         ( 8 of them )
      ) or ( all of them )
}

rule well_known_082218 {
   meta:
      description = "shell5 - file well-known.php"
      author = "Brian Laskowski"
      reference = "https://github.com/Hestat/lw-yara/"
      date = "2018-08-23"
      hash1 = "aaf89d834724969f174bfb65cf1503739794746f9904894cec8febd715baacd9"
   strings:
      $s1 = "'pTIwnJSfL2uupaZbWUWyp1fapzImW10cYvp8Y3EyrUEupzIuCwjiMTy2CwjiMz9loG4aB2WlMJSeB2Aup2HtVaAw' , " fullword ascii
      $s2 = "'qTyiovO2LJk1MG0vY2I0Ll9mp2tiVw5ZnJ51rP1mp2t8Y29jqTyiow4aB2IwnT8tWmjip2IfMJA0CwjiMz9loG48' , " fullword ascii
      $s3 = "$password = \"d6d9172da07e6c44c1fbcb571fd0a8f6\"; " fullword ascii
      $s4 = "'sFOzqJ5wqTyiovOhMvuuYTVcVUftpzHtCFOjpz9gpUDbVgQPinwQ+lVfLvx7VTyzXUWyXFO7VPDbW2qiWlxhqzSf' , " fullword ascii
      $s5 = "'CwjiMz9loG48MTy2VTAfLKAmCFWuL3EuoTjvVUA0rJkyCFWjLJExnJ5aBwujrQgjLJExnJ5aYKWcM2u0BwL4pUt7' , " fullword ascii
      $s6 = "'Vw48C3ObpPOyL2uiVUObpS91ozSgMFtcYvp8LaV+Wl4xK1ASHyMSHyfaH0IFIxIFK1ACEyEKDIWSW107Cm48Y2Ec' , " fullword ascii
      $s7 = "'qUV+WmgyL2uiVPp8Y3EuLzkyCwjiMz9loG4aB2yzXTAiqJ50XPEsHR9GISfaqUyjMKZaKFxtCvNjXFO7WT1uqTAb' , " fullword ascii
      $s8 = "'BlO9VU1zqJ5wqTyiovO0rUEmXT0fpPkuXFO7VUNtCFOmMPujXGftpzHtCFOjpz9gpUDboFkjXGftnJLbpzHcVUft' , " fullword ascii
      $s9 = "'JlqwnTIwnlqqYvpvCvp7VU1yL2uiVPp8nJ5jqKDtqUyjMG0vp3IvoJy0VvO2LJk1MG0vVR8tFlNvCwjiMz9loG48' , " fullword ascii
      $s10 = "'WGV3Y2pfVvpvXGftpzI0qKWhVUA0pwftsJM1ozA0nJ9hVTAxXTEcpvxtrlOxnKVtCFOmMPuxnKVcBlNxXPqxnKVa' , " fullword ascii
      $s11 = "'GHIQDHgSDxSaH2uOHHyWo1SSD0EYEHWOnRAbDISWIJ9EEHAODHSODHSOHwOBER9cDJ9FZQIJF1AOZRkdEKIAnHS5' , " fullword ascii
      $s12 = "'ozA0nJ9hVTSwqUZbpPkuYTLcVUftpPN9VUAxXUNcBlOzVQ0tp2DbMvx7VUWyVQ0tpUWioKO0XTLfpPx7VTyzXUWy' , " fullword ascii
      $s13 = "'VUMuoUIyCFYJgAQDVw48Y3ExCwjiqUV+WmgyL2uiVPp8Y3EuLzkyCwjiMz9loG4aB2yzXPElo3qmXFO7MJAbolNa' , " fullword ascii
      $s14 = "'DIIODHSODHSPZT1OHHyODHSODHSADHMEDHSODHSOp0caEHAODHSODHSRDHWMDHSODHSOGSAMDxSaDHSODHSOq0SL' , " fullword ascii
      $s15 = "'MTy2Cvp7MJAbolNaCTMipz0tozSgMG0vMaWgZFVtnJD9VzMloGRvVT1yqTuiMQ0vHR9GIPV+CUEuLzkyVTAfLKAm' , " fullword ascii
      $s16 = "* Language and charset conversion settings" fullword ascii
      $s17 = "'DHSODHSODz5ODHSOD1SODHSOFHSODHSAM3qEFHEOGHSODJqODHSOEHSODHSODHSODHSEDHSODHyODHSOL0SODHSO' , " fullword ascii
      $s18 = "'GHIaBRSSnKqQFatirHbjLzqODHSODGt2pxuFD1SWDzqODHSAMRIXDISPDHSODKu3HJgOM0SODH9dBF9zYl9cIIu3' , " fullword ascii
      $s19 = "'DHSODHSODHSOD0SODHSOM0SODHMaDHSOEPfiYmy2DJqODHSCrHAPDJcmDJqODHyODHSODIIODHSODxSODHSPDHSO' , " fullword ascii
      $s20 = "'APxcB3WyqUIlovOmpUWcoaEzXPpyYwWzVPphWTSlpzS5JlEzoT9ipy0fXPEvrKEypl9jo3pbZGNlAPkzoT9ipvtx' , " fullword ascii
   condition:
      ( uint16(0) == 0x3f3c and
         filesize < 300KB and
         ( 8 of them )
      ) or ( all of them )
}

rule infected_language_ru_082218 {
   meta:
      description = "shell5 - file master-language_ru.php"
      author = "Brian Laskowski"
      reference = "https://github.com/Hestat/lw-yara/"
      date = "2018-08-23"
      hash1 = "7d97b8ce81e08ab2ea6ee043f32a9c91a250baf2e356630c89708dfbe3c79e32"
   strings:
      $s1 = "$x($_POST['tb_id']);" fullword ascii
   condition:
      ( uint16(0) == 0x3f3c and
         filesize < 2KB and
         ( all of them )
      ) or ( all of them )
}

Rule Metadata

description
shell5 - file pomo.php3
author
Brian Laskowski
reference
https://github.com/Hestat/lw-yara/
date
2018-08-23
hash1
6f986483b7dbfb173bb3744c19a839d793dd53248e09b9da63906f9e3e1fbb7b

String Definitions

{"name":"$s1","value":"\"wp_redirect(get_bloginfo('wpurl') . '\/wp-admin');\" fullword ascii"}
{"name":"$s2","value":"\"wp_set_current_user("}
{"name":"$s3","value":"\"echo \\\"You are logged in as"}
{"name":"$s4","value":"\"do_action('wp_login',"}
{"name":"$s5","value":"\""}
{"name":"$user_login","value":"$user_info->user_login;\" fullword ascii"}
{"name":"$s6","value":"\""}
{"name":"$user_ids","value":"$wpdb->get_results("}
{"name":"$s7","value":"\""}
{"name":"$query_str","value":"\\\"SELECT ID FROM"}
{"name":"$s8","value":"\"require('..\/..\/wp-blog-header.php');\" fullword ascii"}
{"name":"$s9","value":"\""}
{"name":"$user_info","value":"get_userdata("}
{"name":"$s10","value":"\"if (function_exists('get_admin_url')) {\" fullword ascii"}
{"name":"$s11","value":"\"wp_redirect(get_admin_url());\" 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 infected_08_22_18_admin_backdoor_pomo.yar /path/to/suspicious/file

# Scan a directory recursively
yara -r infected_08_22_18_admin_backdoor_pomo.yar /path/to/directory/

# Scan with metadata output
yara -m infected_08_22_18_admin_backdoor_pomo.yar target_file

# Scan process memory (Linux)
yara infected_08_22_18_admin_backdoor_pomo.yar /proc/[pid]/exe

Integration Examples

Python (yara-python)

import yara
rules = yara.compile(filepath='infected_08_22_18_admin_backdoor_pomo.yar')
matches = rules.match('/path/to/file')

ClamAV Integration

clamscan --yara-rules=infected_08_22_18_admin_backdoor_pomo.yar /path/to/scan

Rule Information

YARA ID
YARA-2018-3685
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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