UNC2891_Steelcorgi
YARA-2024-0173
Medium
general
Active
Detects UNC2891 Steelcorgi packed ELF binaries
UNC2891_Steelcorgi.yar
Valid Syntax
rule UNC2891_Steelcorgi
{
meta:
description = "Detects UNC2891 Steelcorgi packed ELF binaries"
author = "Frank Boldewin (@r3c0nst)"
date = "2022-30-03"
hash1 = "0760cd30d18517e87bf9fd8555513423db1cd80730b47f57167219ddbf91f170"
hash2 = "3560ed07aac67f73ef910d0b928db3c0bb5f106b5daee054666638b6575a89c5"
hash3 = "5b4bb50055b31dbd897172583c7046dd27cd03e1e3d84f7a23837e8df7943547"
strings:
$pattern1 = {70 61 64 00 6C 63 6B 00} // padlck
$pattern2 = {FF 72 FF 6F FF 63 FF 2F FF 73 FF 65 FF 6C FF 66 FF 2F FF 65 FF 78 FF 65} // proc_self_exe
condition:
uint32(0) == 0x464c457f and all of them
}
Rule Metadata
description
Detects UNC2891 Steelcorgi packed ELF binaries
author
Frank Boldewin (@r3c0nst)
date
2022-30-03
hash1
0760cd30d18517e87bf9fd8555513423db1cd80730b47f57167219ddbf91f170
hash2
3560ed07aac67f73ef910d0b928db3c0bb5f106b5daee054666638b6575a89c5
hash3
5b4bb50055b31dbd897172583c7046dd27cd03e1e3d84f7a23837e8df7943547
String Definitions
{"name":"$pattern1","value":"{70 61 64 00 6C 63 6B 00} \/\/ padlck"}
{"name":"$pattern2","value":"{FF 72 FF 6F FF 63 FF 2F FF 73 FF 65 FF 6C FF 66 FF 2F FF 65 FF 78 FF 65} \/\/ proc_self_exe"}
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 UNC2891_Steelcorgi.yar /path/to/suspicious/file # Scan a directory recursively yara -r UNC2891_Steelcorgi.yar /path/to/directory/ # Scan with metadata output yara -m UNC2891_Steelcorgi.yar target_file # Scan process memory (Linux) yara UNC2891_Steelcorgi.yar /proc/[pid]/exe
Integration Examples
Python (yara-python)
import yara
rules = yara.compile(filepath='UNC2891_Steelcorgi.yar')
matches = rules.match('/path/to/file')
ClamAV Integration
clamscan --yara-rules=UNC2891_Steelcorgi.yar /path/to/scan
Rule Information
YARA ID
YARA-2024-0173
Author
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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