Possible_Emotet_DLL
YARA-2025-0129
Medium
general
Active
observed indicators Emotet DLL loaded into memory March 2022
Possible_Emotet_DLL.yar
Valid Syntax
/*
This Yara ruleset is under the GNU-GPLv2 license (http://www.gnu.org/licenses/gpl-2.0.html) and open to any user or organization, as long as you use it under this license.
*/
import "pe"
rule Possible_Emotet_DLL
{
meta:
author = "Lucas Acha (http://www.lukeacha.com)"
description = "observed indicators Emotet DLL loaded into memory March 2022"
strings:
$htt1 = "MS Shell Dlg" wide
$mzh = "This program cannot be run in DOS mode"
condition:
(pe.imphash() == "066d4e2c6288c042d958ddc93cfa07f1" or pe.imphash() == " 38617efee413c2d5919637769ddb6a9") and $htt1 and $mzh
}
Rule Metadata
author
Lucas Acha (http://www.lukeacha.com)
description
observed indicators Emotet DLL loaded into memory March 2022
String Definitions
{"name":"$htt1","value":"\"MS Shell Dlg\" wide"}
{"name":"$mzh","value":"\"This program cannot be run in DOS mode\""}
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 Possible_Emotet_DLL.yar /path/to/suspicious/file # Scan a directory recursively yara -r Possible_Emotet_DLL.yar /path/to/directory/ # Scan with metadata output yara -m Possible_Emotet_DLL.yar target_file # Scan process memory (Linux) yara Possible_Emotet_DLL.yar /proc/[pid]/exe
Integration Examples
Python (yara-python)
import yara
rules = yara.compile(filepath='Possible_Emotet_DLL.yar')
matches = rules.match('/path/to/file')
ClamAV Integration
clamscan --yara-rules=Possible_Emotet_DLL.yar /path/to/scan
Rule Information
YARA ID
YARA-2025-0129
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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