lyceum_golang_backdoor

YARA-2025-2219 High general Active

No description available for this rule

lyceum_golang_backdoor.yar Valid Syntax

rule lyceum_golang_backdoor
{
    meta:
        author = "CPR"
        reference = "https://research.checkpoint.com/2022/state-sponsored-attack-groups-capitalise-on-russia-ukraine-war-for-cyber-espionage/"
        hash1 = "a437f997d45bc14e76d0f2482f572a34"
        hash2 = "23d174e6a0905fd59b2613d5ac106261"
        hash3 = "bcb465cc2257e5777bab431690ca5039"
    strings:
        $func1 = "main.Ase256"
        $func2 = "main.DecryptAse256"
        $func3 = "main.IsServerUp"
        $func4 = "main.register"
        $func5 = "main.commandforrun"
        $func6 = "main.UPLOAD"
        $func7 = "main.commandforanswer"
        $func8 = "main.GetMD5Hash"
        $func9 = "main.get_uid"
        $func10 = "main.commandrun"
        $func11 = "main.download"
        $func12 = "main.postFile"
        $func13 = "main.sendAns"
        $func14 = "main.comRun"
        $cnc_uri1 = "/GO/1.php"
        $cnc_uri2 = "/GO/2.php"
        $cnc_uri3 = "/GO/3.php"
        $auth_token = "auth_token=\"XXXXXXX\""
        $log1 = "client registred"
        $log2 = "no command"
        $log3 = "can not create file"
        $log4 = "errorGettingUserName"
        $log5 = "New record created successfully"
        $log6 = "SERVER_IS_DOWN"
        $dga = "trailers.apple.com."
    condition:
        uint16(0)==0x5a4d and ((10 of ($func*) or any of ($cnc_uri*) or $auth_token or 3 of ($log*)) or ($dga and 4 of them))
}

Rule Metadata

author

CPR

reference

https://research.checkpoint.com/2022/state-sponsored-attack-groups-capitalise-on-russia-ukraine-war-for-cyber-espionage/

hash1

a437f997d45bc14e76d0f2482f572a34

hash2

23d174e6a0905fd59b2613d5ac106261

hash3

bcb465cc2257e5777bab431690ca5039

String Definitions

{"name":"$func1","value":"\"main.Ase256\""}

{"name":"$func2","value":"\"main.DecryptAse256\""}

{"name":"$func3","value":"\"main.IsServerUp\""}

{"name":"$func4","value":"\"main.register\""}

{"name":"$func5","value":"\"main.commandforrun\""}

{"name":"$func6","value":"\"main.UPLOAD\""}

{"name":"$func7","value":"\"main.commandforanswer\""}

{"name":"$func8","value":"\"main.GetMD5Hash\""}

{"name":"$func9","value":"\"main.get_uid\""}

{"name":"$func10","value":"\"main.commandrun\""}

{"name":"$func11","value":"\"main.download\""}

{"name":"$func12","value":"\"main.postFile\""}

{"name":"$func13","value":"\"main.sendAns\""}

{"name":"$func14","value":"\"main.comRun\""}

{"name":"$cnc_uri1","value":"\"\/GO\/1.php\""}

{"name":"$cnc_uri2","value":"\"\/GO\/2.php\""}

{"name":"$cnc_uri3","value":"\"\/GO\/3.php\""}

{"name":"$auth_token","value":"\"auth_token=\\\"XXXXXXX\\\"\""}

{"name":"$log1","value":"\"client registred\""}

{"name":"$log2","value":"\"no command\""}

{"name":"$log3","value":"\"can not create file\""}

{"name":"$log4","value":"\"errorGettingUserName\""}

{"name":"$log5","value":"\"New record created successfully\""}

{"name":"$log6","value":"\"SERVER_IS_DOWN\""}

{"name":"$dga","value":"\"trailers.apple.com.\""}

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 lyceum_golang_backdoor.yar /path/to/suspicious/file

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

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

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

Integration Examples

Python (yara-python)

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

ClamAV Integration

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

Rule Information

YARA ID

YARA-2025-2219

Author

CPR

Repository

mikesxrs_Open-Source-YARA-rules

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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lyceum_golang_backdoor

Rule Metadata

String Definitions

Threat Analysis

Detection Capabilities

Command Line Usage

Integration Examples

Python (yara-python)

ClamAV Integration

Rule Information

Threat Intelligence

Related Rules

Export Options

Similar Rules in general

Detect_Mimic_Ransomware

SystemBC_malware

detect_catB

detect_Typhon_Stealer

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detect_Lumma_stealer

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