backdoor_apt_pcclient
YARA-2012-0007
High
general
Active
Detects the dropper: 869fa4dfdbabfabe87d334f85ddda234 AKA dw20.dll/msacm32.drv dropped by 4a85af37de44daf5917f545c6fd03902 (RTF)
backdoor_apt_pcclient.yar
Valid Syntax
rule backdoor_apt_pcclient
{
meta:
author = "@patrickrolsen"
maltype = "APT.PCCLient"
filetype = "DLL"
version = "0.1"
description = "Detects the dropper: 869fa4dfdbabfabe87d334f85ddda234 AKA dw20.dll/msacm32.drv dropped by 4a85af37de44daf5917f545c6fd03902 (RTF)"
date = "2012-10"
strings:
$magic = { 4d 5a } // MZ
$string1 = "www.micro1.zyns.com"
$string2 = "Mozilla/4.0 (compatible; MSIE 8.0; Win32)"
$string3 = "msacm32.drv" wide
$string4 = "C:\\Windows\\Explorer.exe" wide
$string5 = "Elevation:Administrator!" wide
$string6 = "C:\\Users\\cmd\\Desktop\\msacm32\\Release\\msacm32.pdb"
condition:
$magic at 0 and 4 of ($string*)
}Rule Metadata
author
@patrickrolsen
maltype
APT.PCCLient
filetype
DLL
version
0.1
description
Detects the dropper: 869fa4dfdbabfabe87d334f85ddda234 AKA dw20.dll/msacm32.drv dropped by 4a85af37de44daf5917f545c6fd03902 (RTF)
date
2012-10
String Definitions
{"name":"$magic","value":"{ 4d 5a } \/\/ MZ"}
{"name":"$string1","value":"\"www.micro1.zyns.com\""}
{"name":"$string2","value":"\"Mozilla\/4.0 (compatible; MSIE 8.0; Win32)\""}
{"name":"$string3","value":"\"msacm32.drv\" wide"}
{"name":"$string4","value":"\"C:\\\\Windows\\\\Explorer.exe\" wide"}
{"name":"$string5","value":"\"Elevation:Administrator!\" wide"}
{"name":"$string6","value":"\"C:\\\\Users\\\\cmd\\\\Desktop\\\\msacm32\\\\Release\\\\msacm32.pdb\""}
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 backdoor_apt_pcclient.yar /path/to/suspicious/file # Scan a directory recursively yara -r backdoor_apt_pcclient.yar /path/to/directory/ # Scan with metadata output yara -m backdoor_apt_pcclient.yar target_file # Scan process memory (Linux) yara backdoor_apt_pcclient.yar /proc/[pid]/exe
Integration Examples
Python (yara-python)
import yara
rules = yara.compile(filepath='backdoor_apt_pcclient.yar')
matches = rules.match('/path/to/file')
ClamAV Integration
clamscan --yara-rules=backdoor_apt_pcclient.yar /path/to/scan
Rule Information
YARA ID
YARA-2012-0007
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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