Misdat_Backdoor_Packed
YARA-2025-1513
High
general
Active
No description available for this rule
Misdat_Backdoor_Packed.yar
Valid Syntax
rule Misdat_Backdoor_Packed
{
meta:
author = "Cylance SPEAR Team"
note = "Probably Prone to False Positive"
strings:
$upx = {33 2E 30 33 00 55 50 58 21}
$send = {00 00 00 73 65 6E 64 00 00 00}
$delphi_sec_pe = {50 45 00 00 4C 01 03 00 19 5E 42 2A}
$shellexec = {00 00 00 53 68 65 6C 6C 45 78 65 63 75 74 65 57 00 00 00}
condition:
filesize < 100KB and $upx and $send and $delphi_sec_pe and $shellexec
}Rule Metadata
author
Cylance SPEAR Team
note
Probably Prone to False Positive
String Definitions
{"name":"$upx","value":"{33 2E 30 33 00 55 50 58 21}"}
{"name":"$send","value":"{00 00 00 73 65 6E 64 00 00 00}"}
{"name":"$delphi_sec_pe","value":"{50 45 00 00 4C 01 03 00 19 5E 42 2A}"}
{"name":"$shellexec","value":"{00 00 00 53 68 65 6C 6C 45 78 65 63 75 74 65 57 00 00 00}"}
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 Misdat_Backdoor_Packed.yar /path/to/suspicious/file # Scan a directory recursively yara -r Misdat_Backdoor_Packed.yar /path/to/directory/ # Scan with metadata output yara -m Misdat_Backdoor_Packed.yar target_file # Scan process memory (Linux) yara Misdat_Backdoor_Packed.yar /proc/[pid]/exe
Integration Examples
Python (yara-python)
import yara
rules = yara.compile(filepath='Misdat_Backdoor_Packed.yar')
matches = rules.match('/path/to/file')
ClamAV Integration
clamscan --yara-rules=Misdat_Backdoor_Packed.yar /path/to/scan
Rule Information
YARA ID
YARA-2025-1513
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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