FE_APT_Backdoor_Linux32_SLOWPULSE_1
YARA-2025-1135
High
general
Active
No description available for this rule
FE_APT_Backdoor_Linux32_SLOWPULSE_1.yar
Valid Syntax
// Copyright 2021 by FireEye, Inc.
// You may not use this file except in compliance with the license. The license should have been received with this file.
rule FE_APT_Backdoor_Linux32_SLOWPULSE_1
{
meta:
author = "Mandiant"
date_created = "2021-04-16"
sha256 = "cd09ec795a8f4b6ced003500a44d810f49943514e2f92c81ab96c33e1c0fbd68"
reference_url = "https://www.fireeye.com/blog/threat-research/2021/04/suspected-apt-actors-leverage-bypass-techniques-pulse-secure-zero-day.html"
strings:
$sb1 = {FC b9 [4] e8 00 00 00 00 5? 8d b? [4] 8b}
$sb2 = {f3 a6 0f 85 [4] b8 03 00 00 00 5? 5? 5?}
$sb3 = {9c 60 e8 00 00 00 00 5? 8d [5] 85 ?? 0f 8?}
$sb4 = {89 13 8b 51 04 89 53 04 8b 51 08 89 53 08}
$sb5 = {8d [5] b9 [4] f3 a6 0f 8?}
condition:
((uint32(0) == 0x464c457f) and (uint8(4) == 1)) and all of them
}
Rule Metadata
author
Mandiant
date_created
2021-04-16
sha256
cd09ec795a8f4b6ced003500a44d810f49943514e2f92c81ab96c33e1c0fbd68
reference_url
https://www.fireeye.com/blog/threat-research/2021/04/suspected-apt-actors-leverage-bypass-techniques-pulse-secure-zero-day.html
String Definitions
{"name":"$sb1","value":"{FC b9 [4] e8 00 00 00 00 5? 8d b? [4] 8b}"}
{"name":"$sb2","value":"{f3 a6 0f 85 [4] b8 03 00 00 00 5? 5? 5?}"}
{"name":"$sb3","value":"{9c 60 e8 00 00 00 00 5? 8d [5] 85 ?? 0f 8?}"}
{"name":"$sb4","value":"{89 13 8b 51 04 89 53 04 8b 51 08 89 53 08}"}
{"name":"$sb5","value":"{8d [5] b9 [4] f3 a6 0f 8?}"}
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 FE_APT_Backdoor_Linux32_SLOWPULSE_1.yar /path/to/suspicious/file # Scan a directory recursively yara -r FE_APT_Backdoor_Linux32_SLOWPULSE_1.yar /path/to/directory/ # Scan with metadata output yara -m FE_APT_Backdoor_Linux32_SLOWPULSE_1.yar target_file # Scan process memory (Linux) yara FE_APT_Backdoor_Linux32_SLOWPULSE_1.yar /proc/[pid]/exe
Integration Examples
Python (yara-python)
import yara
rules = yara.compile(filepath='FE_APT_Backdoor_Linux32_SLOWPULSE_1.yar')
matches = rules.match('/path/to/file')
ClamAV Integration
clamscan --yara-rules=FE_APT_Backdoor_Linux32_SLOWPULSE_1.yar /path/to/scan
Rule Information
YARA ID
YARA-2025-1135
Author
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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