MeldSecurity
Press Enter to search
CVE Database & Search →
Sign In Get Started

Backdoor_Naikon_APT_Sample1

YARA-2015-0248 High general Active

Detects backdoors related to the Naikon APT

Backdoor_Naikon_APT_Sample1.yar Valid Syntax 

rule Backdoor_Naikon_APT_Sample1 {
	meta:
		description = "Detects backdoors related to the Naikon APT"
		author = "Florian Roth"
		reference = "https://goo.gl/7vHyvh"
		date = "2015-05-14"
		hash = "d5716c80cba8554eb79eecfb4aa3d99faf0435a1833ec5ef51f528146c758eba"
		hash = "f5ab8e49c0778fa208baad660fe4fa40fc8a114f5f71614afbd6dcc09625cb96"
	strings:
		$x0 = "GET http://%s:%d/aspxabcdef.asp?%s HTTP/1.1" fullword ascii
		$x1 = "POST http://%s:%d/aspxabcdefg.asp?%s HTTP/1.1" fullword ascii
		$x2 = "greensky27.vicp.net" fullword ascii
		$x3 = "\\tempvxd.vxd.dll" fullword wide
		$x4 = "otna.vicp.net" fullword ascii
		$x5 = "smithking19.gicp.net" fullword ascii
		
		$s1 = "User-Agent: webclient" fullword ascii
		$s2 = "\\User.ini" fullword ascii
		$s3 = "User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; zh-EN; rv:1.7.12) Gecko/200" ascii
		$s4 = "\\UserProfile.dll" fullword wide
		$s5 = "Connection:Keep-Alive: %d" fullword ascii
		$s6 = "Referer: http://%s:%d/" fullword ascii
		$s7 = "%s %s %s %d %d %d " fullword ascii
		$s8 = "%s--%s" fullword wide
		$s9 = "Run File Success!" fullword wide
		$s10 = "DRIVE_REMOTE" fullword wide
		$s11 = "ProxyEnable" fullword wide
		$s12 = "\\cmd.exe" fullword wide
	condition:
		uint16(0) == 0x5a4d and filesize < 1000KB and
		(
			1 of ($x*) or 7 of ($s*)
		)
}

Rule Metadata

description
Detects backdoors related to the Naikon APT
author
Florian Roth
reference
https://goo.gl/7vHyvh
date
2015-05-14
hash
f5ab8e49c0778fa208baad660fe4fa40fc8a114f5f71614afbd6dcc09625cb96

String Definitions

{"name":"$x0","value":"\"GET http:\/\/%s:%d\/aspxabcdef.asp?%s HTTP\/1.1\" fullword ascii"}
{"name":"$x1","value":"\"POST http:\/\/%s:%d\/aspxabcdefg.asp?%s HTTP\/1.1\" fullword ascii"}
{"name":"$x2","value":"\"greensky27.vicp.net\" fullword ascii"}
{"name":"$x3","value":"\"\\\\tempvxd.vxd.dll\" fullword wide"}
{"name":"$x4","value":"\"otna.vicp.net\" fullword ascii"}
{"name":"$x5","value":"\"smithking19.gicp.net\" fullword ascii"}
{"name":"$s1","value":"\"User-Agent: webclient\" fullword ascii"}
{"name":"$s2","value":"\"\\\\User.ini\" fullword ascii"}
{"name":"$s3","value":"\"User-Agent: Mozilla\/5.0 (Windows; U; Windows NT 5.1; zh-EN; rv:1.7.12) Gecko\/200\" ascii"}
{"name":"$s4","value":"\"\\\\UserProfile.dll\" fullword wide"}
{"name":"$s5","value":"\"Connection:Keep-Alive: %d\" fullword ascii"}
{"name":"$s6","value":"\"Referer: http:\/\/%s:%d\/\" fullword ascii"}
{"name":"$s7","value":"\"%s %s %s %d %d %d \" fullword ascii"}
{"name":"$s8","value":"\"%s--%s\" fullword wide"}
{"name":"$s9","value":"\"Run File Success!\" fullword wide"}
{"name":"$s10","value":"\"DRIVE_REMOTE\" fullword wide"}
{"name":"$s11","value":"\"ProxyEnable\" fullword wide"}
{"name":"$s12","value":"\"\\\\cmd.exe\" fullword wide"}

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_Naikon_APT_Sample1.yar /path/to/suspicious/file

# Scan a directory recursively
yara -r Backdoor_Naikon_APT_Sample1.yar /path/to/directory/

# Scan with metadata output
yara -m Backdoor_Naikon_APT_Sample1.yar target_file

# Scan process memory (Linux)
yara Backdoor_Naikon_APT_Sample1.yar /proc/[pid]/exe

Integration Examples

Python (yara-python)

import yara
rules = yara.compile(filepath='Backdoor_Naikon_APT_Sample1.yar')
matches = rules.match('/path/to/file')

ClamAV Integration

clamscan --yara-rules=Backdoor_Naikon_APT_Sample1.yar /path/to/scan

Rule Information

YARA ID
YARA-2015-0248
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

Related Rules

apt_actor_tran_duy_linh
YARA-2025-1093
Medium
backoff
YARA-2014-0023
Medium
APT20140414_1PE
YARA-2025-1094
Medium
Apolmy_Privesc_Trojan
YARA-2015-0069
Medium
Emissary_APT_Malware_1
YARA-2016-0154
Medium

Export Options

Similar Rules in general

YARA-2023-0001 CRI

Detect_Mimic_Ransomware

Detect_Mimic_Ransomware
YARA-2023-0002 MED

SystemBC_malware

Detect_SystemBC
YARA-2023-0003 MED

detect_catB

detect_CatB_ransomware
YARA-2022-0001 MED

detect_Typhon_Stealer

detect_Typhon_Stealer
YARA-2023-0004 MED

Nosu_stealer

Detect_Nosu_stealer
YARA-2022-0002 MED

detect_Lumma_stealer

detect_Lumma_stealer
YARA-2022-0003 MED

detect_StrelaStealer

detect_StrelaStealer
YARA-2022-0004 MED

detect_silence_Downloader

detect_silence_Downloader