KeyBoy_Backdoor
YARA-2025-1793
High
general
Active
No description available for this rule
KeyBoy_Backdoor.yar
Valid Syntax
rule KeyBoy_Backdoor
{
meta:
author = "Rapid7 Labs"
reference = "https://community.rapid7.com/community/infosec/blog/2013/06/07/keyboy-targeted-attacks-against-vietnam-and-india"
strings:
$1 = "$login$"
$2 = "$sysinfo$"
$3 = "$shell$"
$4 = "$fileManager$"
$5 = "$fileDownload$"
$6 = "$fileUpload$"
condition:
all of them
}
rule KeyBoy_Dropper
{
meta:
author = "Rapid7 Labs"
reference = "https://community.rapid7.com/community/infosec/blog/2013/06/07/keyboy-targeted-attacks-against-vietnam-and-india"
strings:
$1 = "I am Admin"
$2 = "I am User"
$3 = "Run install success!"
$4 = "Service install success!"
$5 = "Something Error!"
$6 = "Not Configed, Exiting"
condition:
all of them
}
Rule Metadata
author
Rapid7 Labs
reference
https://community.rapid7.com/community/infosec/blog/2013/06/07/keyboy-targeted-attacks-against-vietnam-and-india
String Definitions
{"name":"$1","value":"\""}
{"name":"$2","value":"\""}
{"name":"$3","value":"\""}
{"name":"$4","value":"\""}
{"name":"$5","value":"\""}
{"name":"$6","value":"\""}
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 KeyBoy_Backdoor.yar /path/to/suspicious/file # Scan a directory recursively yara -r KeyBoy_Backdoor.yar /path/to/directory/ # Scan with metadata output yara -m KeyBoy_Backdoor.yar target_file # Scan process memory (Linux) yara KeyBoy_Backdoor.yar /proc/[pid]/exe
Integration Examples
Python (yara-python)
import yara
rules = yara.compile(filepath='KeyBoy_Backdoor.yar')
matches = rules.match('/path/to/file')
ClamAV Integration
clamscan --yara-rules=KeyBoy_Backdoor.yar /path/to/scan
Rule Information
YARA ID
YARA-2025-1793
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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