APT_Dropper_Win64_MATRYOSHKA_1
YARA-2025-0924
Medium
general
Active
matryoshka_dropper.rs
APT_Dropper_Win64_MATRYOSHKA_1.yar
Valid Syntax
// Copyright 2020 by FireEye, Inc.
// You may not use this file except in compliance with the license. The license should have been received with this file. You may obtain a copy of the license at:
// https://github.com/fireeye/red_team_tool_countermeasures/blob/master/LICENSE.txt
rule APT_Dropper_Win64_MATRYOSHKA_1
{
meta:
date_created = "2020-12-02"
date_modified = "2020-12-02"
description = "matryoshka_dropper.rs"
md5 = "edcd58ba5b1b87705e95089002312281"
rev = 1
author = "FireEye"
strings:
$sb1 = { 8D 8D [4] E8 [4] 49 89 D0 C6 [2-6] 01 C6 [2-6] 01 [0-8] C7 44 24 ?? 0E 00 00 00 4C 8D 0D [4] 48 8D 8D [4] 48 89 C2 E8 [4] C6 [2-6] 01 C6 [2-6] 01 48 89 E9 48 8D 95 [4] E8 [4] 83 [2] 01 0F 8? [4] 48 01 F3 48 29 F7 48 [2] 08 48 89 85 [4] C6 [2-6] 01 C6 [2-6] 01 C6 [2-6] 01 48 8D 8D [4] 48 89 DA 49 89 F8 E8 }
$sb2 = { 0F 29 45 ?? 48 C7 45 ?? 00 00 00 00 0F 29 45 ?? 0F 29 45 ?? 0F 29 45 ?? 0F 29 45 ?? 0F 29 45 ?? 0F 29 45 ?? 48 C7 45 ?? 00 00 00 00 C7 45 ?? 68 00 00 00 48 8B [2] 48 8D [2] 48 89 [3] 48 89 [3] 0F 11 44 24 ?? C7 44 24 ?? 08 00 00 0C C7 44 24 ?? 00 00 00 00 31 ?? 48 89 ?? 31 ?? 45 31 ?? 45 31 ?? E8 [4] 83 F8 01 }
condition:
(uint16(0) == 0x5A4D) and (uint32(uint32(0x3C)) == 0x00004550) and (uint16(uint32(0x3C)+0x18) == 0x020B) and all of them
}Rule Metadata
date_created
2020-12-02
date_modified
2020-12-02
description
matryoshka_dropper.rs
md5
edcd58ba5b1b87705e95089002312281
author
FireEye
String Definitions
{"name":"$sb1","value":"{ 8D 8D [4] E8 [4] 49 89 D0 C6 [2-6] 01 C6 [2-6] 01 [0-8] C7 44 24 ?? 0E 00 00 00 4C 8D 0D [4] 48 8D 8D [4] 48 89 C2 E8 [4] C6 [2-6] 01 C6 [2-6] 01 48 89 E9 48 8D 95 [4] E8 [4] 83 [2] 01 0F 8? [4] 48 01 F3 48 29 F7 48 [2] 08 48 89 85 [4] C6 [2-6] 01 C6 [2-6] 01 C6 [2-6] 01 48 8D 8D [4] 48 89 DA 49 89 F8 E8 }"}
{"name":"$sb2","value":"{ 0F 29 45 ?? 48 C7 45 ?? 00 00 00 00 0F 29 45 ?? 0F 29 45 ?? 0F 29 45 ?? 0F 29 45 ?? 0F 29 45 ?? 0F 29 45 ?? 48 C7 45 ?? 00 00 00 00 C7 45 ?? 68 00 00 00 48 8B [2] 48 8D [2] 48 89 [3] 48 89 [3] 0F 11 44 24 ?? C7 44 24 ?? 08 00 00 0C C7 44 24 ?? 00 00 00 00 31 ?? 48 89 ?? 31 ?? 45 31 ?? 45 31 ?? E8 [4] 83 F8 01 }"}
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 APT_Dropper_Win64_MATRYOSHKA_1.yar /path/to/suspicious/file # Scan a directory recursively yara -r APT_Dropper_Win64_MATRYOSHKA_1.yar /path/to/directory/ # Scan with metadata output yara -m APT_Dropper_Win64_MATRYOSHKA_1.yar target_file # Scan process memory (Linux) yara APT_Dropper_Win64_MATRYOSHKA_1.yar /proc/[pid]/exe
Integration Examples
Python (yara-python)
import yara
rules = yara.compile(filepath='APT_Dropper_Win64_MATRYOSHKA_1.yar')
matches = rules.match('/path/to/file')
ClamAV Integration
clamscan --yara-rules=APT_Dropper_Win64_MATRYOSHKA_1.yar /path/to/scan
Rule Information
YARA ID
YARA-2025-0924
Author
Repository
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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