NK_GOLDBACKDOOR_inital_shellcode
YARA-2025-1314
High
general
Active
Detection for initial shellcode loader used to deploy GOLDBACDOOR
NK_GOLDBACKDOOR_inital_shellcode.yar
Valid Syntax
rule NK_GOLDBACKDOOR_inital_shellcode
{
meta:
author= "Silas Cutler (silas@Stairwell.com)"
description = "Detection for initial shellcode loader used to deploy GOLDBACDOOR"
reference = "https://stairwell.com/news/threat-research-the-ink-stained-trail-of-goldbackdoor/"
version = "0.1"
strings:
//seg000:07600058 8D 85 70 FE FF FF lea eax, [ebp+var_190]
//seg000:0760005E C7 45 C4 25 6C 6F 63 mov dword ptr [ebp+var_3C],'col%'
//seg000:07600065 50 push eax
//...
//seg000:0760008F C7 45 D8 6F 6C 64 2E mov dword ptr [ebp+var_3C+14h], '.dlo'
//seg000:07600096 C7 45 DC 74 78 74 00 mov dword ptr [ebp+var_3C+18h], 'txt'
$ = { C7 45 C4 25 6C 6F 63 50 8D 45 C4 C7 45 C8 61 6C 61 70 8B F9 C7 45 CC 70 64 61 74 50 B9 BD 88 17 75 C7 45 D0 61 25 5C 6C 8B DA C7 45 D4 6F 67 5F 67 C7 45 D8 6F 6C 64 2E C7 45 DC 74 78 74 00 }
// Import loaders
$ = { 51 50 57 56 B9 E6 8E 85 35 E8 ?? ?? ?? ?? FF D0 }
$ = { 6A 40 68 00 10 00 00 52 6A 00 FF 75 E0 B9 E3 18 90 72 E8 ?? ?? ?? ?? FF D0}
condition:
all of them
}
Rule Metadata
author
Silas Cutler (silas@Stairwell.com)
description
Detection for initial shellcode loader used to deploy GOLDBACDOOR
reference
https://stairwell.com/news/threat-research-the-ink-stained-trail-of-goldbackdoor/
version
0.1
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 NK_GOLDBACKDOOR_inital_shellcode.yar /path/to/suspicious/file # Scan a directory recursively yara -r NK_GOLDBACKDOOR_inital_shellcode.yar /path/to/directory/ # Scan with metadata output yara -m NK_GOLDBACKDOOR_inital_shellcode.yar target_file # Scan process memory (Linux) yara NK_GOLDBACKDOOR_inital_shellcode.yar /proc/[pid]/exe
Integration Examples
Python (yara-python)
import yara
rules = yara.compile(filepath='NK_GOLDBACKDOOR_inital_shellcode.yar')
matches = rules.match('/path/to/file')
ClamAV Integration
clamscan --yara-rules=NK_GOLDBACKDOOR_inital_shellcode.yar /path/to/scan
Rule Information
YARA ID
YARA-2025-1314
Repository
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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