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APT_Backdoor_Win_GORAT_3

YARA-2025-0993 High general Active
No description available for this rule
APT_Backdoor_Win_GORAT_3.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_Backdoor_Win_GORAT_3
{
    meta:
        description = "This rule uses the same logic as FE_APT_Trojan_Win_GORAT_1_FEBeta with the addition of one check, to look for strings that are known to be in the Gorat implant when a certain cleaning script is not run against it."
        md5 = "995120b35db9d2f36d7d0ae0bfc9c10d"
        rev = 5
        author = "FireEye"
    strings:
        $dirty1 = "fireeye" ascii nocase wide
        $dirty2 = "kulinacs" ascii nocase wide
        $dirty3 = "RedFlare" ascii nocase wide
        $dirty4 = "gorat" ascii nocase wide
        $dirty5 = "flare" ascii nocase wide
        $go1 = "go.buildid" ascii wide
        $go2 = "Go build ID:" ascii wide
        $json1 = "json:\"pid\"" ascii wide
        $json2 = "json:\"key\"" ascii wide
        $json3 = "json:\"agent_time\"" ascii wide
        $json4 = "json:\"rid\"" ascii wide
        $json5 = "json:\"ports\"" ascii wide
        $json6 = "json:\"agent_platform\"" ascii wide
        $rat = "rat" ascii wide
        $str1 = "handleCommand" ascii wide
        $str2 = "sendBeacon" ascii wide
        $str3 = "rat.AgentVersion" ascii wide
        $str4 = "rat.Core" ascii wide
        $str5 = "rat/log" ascii wide
        $str6 = "rat/comms" ascii wide
        $str7 = "rat/modules" ascii wide
        $str8 = "murica" ascii wide
        $str9 = "master secret" ascii wide
        $str10 = "TaskID" ascii wide
        $str11 = "rat.New" ascii wide
    condition:
        uint16(0) == 0x5A4D and uint32(uint32(0x3C)) == 0x00004550 and filesize < 10MB and all of ($go*) and all of ($json*) and all of ($str*) and #rat > 1000 and any of ($dirty*)
}

String Definitions

{"name":"$dirty1","value":"\"fireeye\" ascii nocase wide"}
{"name":"$dirty2","value":"\"kulinacs\" ascii nocase wide"}
{"name":"$dirty3","value":"\"RedFlare\" ascii nocase wide"}
{"name":"$dirty4","value":"\"gorat\" ascii nocase wide"}
{"name":"$dirty5","value":"\"flare\" ascii nocase wide"}
{"name":"$go1","value":"\"go.buildid\" ascii wide"}
{"name":"$go2","value":"\"Go build ID:\" ascii wide"}
{"name":"$json1","value":"\"json:\\\"pid\\\"\" ascii wide"}
{"name":"$json2","value":"\"json:\\\"key\\\"\" ascii wide"}
{"name":"$json3","value":"\"json:\\\"agent_time\\\"\" ascii wide"}
{"name":"$json4","value":"\"json:\\\"rid\\\"\" ascii wide"}
{"name":"$json5","value":"\"json:\\\"ports\\\"\" ascii wide"}
{"name":"$json6","value":"\"json:\\\"agent_platform\\\"\" ascii wide"}
{"name":"$rat","value":"\"rat\" ascii wide"}
{"name":"$str1","value":"\"handleCommand\" ascii wide"}
{"name":"$str2","value":"\"sendBeacon\" ascii wide"}
{"name":"$str3","value":"\"rat.AgentVersion\" ascii wide"}
{"name":"$str4","value":"\"rat.Core\" ascii wide"}
{"name":"$str5","value":"\"rat\/log\" ascii wide"}
{"name":"$str6","value":"\"rat\/comms\" ascii wide"}
{"name":"$str7","value":"\"rat\/modules\" ascii wide"}
{"name":"$str8","value":"\"murica\" ascii wide"}
{"name":"$str9","value":"\"master secret\" ascii wide"}
{"name":"$str10","value":"\"TaskID\" ascii wide"}
{"name":"$str11","value":"\"rat.New\" ascii wide"}

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 APT_Backdoor_Win_GORAT_3.yar /path/to/suspicious/file

# Scan a directory recursively
yara -r APT_Backdoor_Win_GORAT_3.yar /path/to/directory/

# Scan with metadata output
yara -m APT_Backdoor_Win_GORAT_3.yar target_file

# Scan process memory (Linux)
yara APT_Backdoor_Win_GORAT_3.yar /proc/[pid]/exe

Integration Examples

Python (yara-python)

import yara
rules = yara.compile(filepath='APT_Backdoor_Win_GORAT_3.yar')
matches = rules.match('/path/to/file')

ClamAV Integration

clamscan --yara-rules=APT_Backdoor_Win_GORAT_3.yar /path/to/scan

Rule Information

YARA ID
YARA-2025-0993
Author
Unknown
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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