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Nosu_stealer

YARA-2023-0004 Medium general Active

Detect_Nosu_stealer

Nosu_stealer.yar Valid Syntax 
rule Nosu_stealer: Nosu
{
    meta:
	description = "Detect_Nosu_stealer"
	author = "@malgamy12"
	date = "2023/1/9"
        license = "DRL 1.1"
        hash = "6499cadaea169c7dfe75b55f9c949659af49649a10c8b593a8db378692a11962"
        hash = "e227246cbebf72eb2867ef21b1b103ec07ddd87f4f8a5ac89a47536d5b831f6d"
        hash = "3d18b9c312abaa8dd93dc0d1abfdc97e72788100fb1effb938b5f6f4fd3b59eb"
        hash = "e513f5e424371cce491ae28d45aaa7e361f370c790dc86bb33dc9313b3660ac3"
  
                
    strings:
	    $s1 = "release\\lilly.pdb" ascii

		
        $op1 = {33 D2 8B C3 F7 F7 8A C3 24 ?? 32 04 32 30 04 19 43 8B 4C 24 ?? 3B DD 72}
        $op2 = {8B 86 [4] 80 34 08 ?? 41 8B 86 [4] 3B C8 72}
	$op3 = {69 D2 [4] 33 C9 42 8B C2 0F A4 C1 ?? 30 0C 1E 46}
        
    condition:
        uint16(0) == 0x5A4D and ($s1 or all of ($op*))
}

Rule Metadata

description
Detect_Nosu_stealer
author
@malgamy12
date
2023/1/9
license
DRL 1.1
hash
e513f5e424371cce491ae28d45aaa7e361f370c790dc86bb33dc9313b3660ac3

Tags

Nosu

String Definitions

{"name":"$s1","value":"\"release\\\\lilly.pdb\" ascii"}
{"name":"$op1","value":"{33 D2 8B C3 F7 F7 8A C3 24 ?? 32 04 32 30 04 19 43 8B 4C 24 ?? 3B DD 72}"}
{"name":"$op2","value":"{8B 86 [4] 80 34 08 ?? 41 8B 86 [4] 3B C8 72}"}
{"name":"$op3","value":"{69 D2 [4] 33 C9 42 8B C2 0F A4 C1 ?? 30 0C 1E 46}"}

Threat Analysis

This YARA rule is designed to detect general threats.

Severity Level: Medium

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 Nosu_stealer.yar /path/to/suspicious/file

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

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

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

Integration Examples

Python (yara-python)

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

ClamAV Integration

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

Rule Information

YARA ID
YARA-2023-0004
Created
August 19, 2025
Last Updated
August 19, 2025
Last Imported
Never

Threat Intelligence

Risk Level Medium
Category general
Detection Confidence Analysis Pending
False Positive Rate Not Available
Last Seen in Wild No Data

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Export Options

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