hkdoor_backdoor
YARA-2025-2122
High
general
Active
Hacker's Door Backdoor
hkdoor_backdoor.yar
Valid Syntax
import "pe"
rule hkdoor_backdoor {
meta:
author = "Cylance"
description = "Hacker's Door Backdoor"
reference = "https://www.cylance.com/en_us/blog/threat-spotlight-opening-hackers-door.html"
strings:
$s1 = "http://www.yythac.com" fullword ascii
$s2 = "Example:%s 192.168.1.100 139 -p yyt_hac -t 1" fullword ascii
$s3 = "password-----------The hacker's door's password" fullword ascii
$s4 = "It is the client of hacker's door %d.%d public version" fullword ascii
$s5 = "hkdoordll.dll" fullword ascii
$s6 = "http://www.yythac.com/images/mm.jpg" fullword ascii
$s7 = "I'mhackeryythac1977" fullword ascii
$s8 = "yythac.yeah.net" fullword ascii
condition:
uint16(0) == 0x5a4d and
filesize < 400KB and
( 4 of ($s*) )
}
Rule Metadata
author
Cylance
description
Hacker's Door Backdoor
reference
https://www.cylance.com/en_us/blog/threat-spotlight-opening-hackers-door.html
String Definitions
{"name":"$s1","value":"\"http:\/\/www.yythac.com\" fullword ascii"}
{"name":"$s2","value":"\"Example:%s 192.168.1.100 139 -p yyt_hac -t 1\" fullword ascii"}
{"name":"$s3","value":"\"password-----------The hacker's door's password\" fullword ascii"}
{"name":"$s4","value":"\"It is the client of hacker's door %d.%d public version\" fullword ascii"}
{"name":"$s5","value":"\"hkdoordll.dll\" fullword ascii"}
{"name":"$s6","value":"\"http:\/\/www.yythac.com\/images\/mm.jpg\" fullword ascii"}
{"name":"$s7","value":"\"I'mhackeryythac1977\" fullword ascii"}
{"name":"$s8","value":"\"yythac.yeah.net\" 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 hkdoor_backdoor.yar /path/to/suspicious/file # Scan a directory recursively yara -r hkdoor_backdoor.yar /path/to/directory/ # Scan with metadata output yara -m hkdoor_backdoor.yar target_file # Scan process memory (Linux) yara hkdoor_backdoor.yar /proc/[pid]/exe
Integration Examples
Python (yara-python)
import yara
rules = yara.compile(filepath='hkdoor_backdoor.yar')
matches = rules.match('/path/to/file')
ClamAV Integration
clamscan --yara-rules=hkdoor_backdoor.yar /path/to/scan
Rule Information
YARA ID
YARA-2025-2122
Author
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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