SType_Backdoor
YARA-2025-1727
High
general
Active
No description available for this rule
SType_Backdoor.yar
Valid Syntax
rule SType_Backdoor
{
meta:
author = "Cylance SPEAR Team"
/* Decode Function
8B 1A mov ebx, [edx]
8A 1B mov bl, [ebx]
80 EB 02 sub bl, 2
8B 74 24 08 mov esi, [esp+14h+var_C]
32 1E xor bl, [esi]
8B 31 mov esi, [ecx]
88 1E mov [esi], bl
8B 1A mov ebx, [edx]
43 inc ebx
89 1A mov [edx], ebx
8B 19 mov ebx, [ecx]
43 inc ebx
89 19 mov [ecx], ebx
48 dec eax
75 E2 jnz short loc_40EAC6
*/
strings:
$stype = "stype=info&data="
$mmid = "?mmid="
$status = "&status=run succeed"
$mutex = "_KB10B2D1_CIlFD2C"
$decode = {8B 1A 8A 1B 80 EB 02 8B 74 24 08 32 1E 8B 31 88 1E 8B 1A 43}
condition:
$stype or ($mmid and $status) or $mutex or $decode
}Rule Metadata
author
Cylance SPEAR Team
String Definitions
{"name":"$stype","value":"\"stype=info&data=\""}
{"name":"$mmid","value":"\"?mmid=\""}
{"name":"$status","value":"\"&status=run succeed\""}
{"name":"$mutex","value":"\"_KB10B2D1_CIlFD2C\""}
{"name":"$decode","value":"{8B 1A 8A 1B 80 EB 02 8B 74 24 08 32 1E 8B 31 88 1E 8B 1A 43}"}
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 SType_Backdoor.yar /path/to/suspicious/file # Scan a directory recursively yara -r SType_Backdoor.yar /path/to/directory/ # Scan with metadata output yara -m SType_Backdoor.yar target_file # Scan process memory (Linux) yara SType_Backdoor.yar /proc/[pid]/exe
Integration Examples
Python (yara-python)
import yara
rules = yara.compile(filepath='SType_Backdoor.yar')
matches = rules.match('/path/to/file')
ClamAV Integration
clamscan --yara-rules=SType_Backdoor.yar /path/to/scan
Rule Information
YARA ID
YARA-2025-1727
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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