Solarmarker_Packer_2
YARA-2025-0128
Medium
general
Active
another version showing observed possible packer in hexdump at specific offset ranges.
Solarmarker_Packer_2.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.
*/
rule Solarmarker_Packer_2
{
meta:
author = "Lucas Acha (http://www.lukeacha.com)"
description = "another version showing observed possible packer in hexdump at specific offset ranges."
reference = "http://security5magics.blogspot.com/2020/12/tracking-jupyter-malware.html"
strings:
$mz = "MZ"
$off1 = { 68 6b 65 79 00 46 72 6f 6d 42 61 73 65 36 34}
$off2 = { 70 61 63 6b 65 64 }
condition:
$off1 in (0x26000..0x32000) and $off2 in (0x26000..0x32000) and $mz at 0
}
Rule Metadata
author
Lucas Acha (http://www.lukeacha.com)
description
another version showing observed possible packer in hexdump at specific offset ranges.
reference
http://security5magics.blogspot.com/2020/12/tracking-jupyter-malware.html
String Definitions
{"name":"$mz","value":"\"MZ\""}
{"name":"$off1","value":"{ 68 6b 65 79 00 46 72 6f 6d 42 61 73 65 36 34}"}
{"name":"$off2","value":"{ 70 61 63 6b 65 64 }"}
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 Solarmarker_Packer_2.yar /path/to/suspicious/file # Scan a directory recursively yara -r Solarmarker_Packer_2.yar /path/to/directory/ # Scan with metadata output yara -m Solarmarker_Packer_2.yar target_file # Scan process memory (Linux) yara Solarmarker_Packer_2.yar /proc/[pid]/exe
Integration Examples
Python (yara-python)
import yara
rules = yara.compile(filepath='Solarmarker_Packer_2.yar')
matches = rules.match('/path/to/file')
ClamAV Integration
clamscan --yara-rules=Solarmarker_Packer_2.yar /path/to/scan
Rule Information
YARA ID
YARA-2025-0128
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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