GhostWriter_MicroBackdoor_72632_00001
YARA-2025-1438
High
general
Active
No description available for this rule
GhostWriter_MicroBackdoor_72632_00001.yar
Valid Syntax
rule GhostWriter_MicroBackdoor_72632_00001 {
meta:
author = "Cluster25"
hash1 = "559d8e8f2c60478d1c057b46ec6be912fae7df38e89553804cc566cac46e8e91"
tlp = "white"
report = "https://blog.cluster25.duskrise.com/2022/03/08/ghostwriter-unc1151-adopts-microbackdoor-variants-in-cyber-operations-against-targets-in-ukraine"
strings:
$ = "cmd.exe /C \"%s%s\"" fullword wide
$ = "client.dll" fullword ascii
$ = "ERROR: Unknown command" fullword ascii
$ = " *** ERROR: Timeout occured" fullword ascii
$ = "%s\\Software\\Microsoft\\Windows\\CurrentVersion\\Internet Settings" fullword ascii
$ = "MIIDazCCAlOgAwIBAgIUWOftflCclQXpmWMnL1ewj2F5Y1AwDQYJKoZIhvcNAQEL" fullword ascii
condition: (uint16(0) == 0x5a4d and all of them)
}Rule Metadata
author
Cluster25
hash1
559d8e8f2c60478d1c057b46ec6be912fae7df38e89553804cc566cac46e8e91
tlp
white
report
https://blog.cluster25.duskrise.com/2022/03/08/ghostwriter-unc1151-adopts-microbackdoor-variants-in-cyber-operations-against-targets-in-ukraine
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 GhostWriter_MicroBackdoor_72632_00001.yar /path/to/suspicious/file # Scan a directory recursively yara -r GhostWriter_MicroBackdoor_72632_00001.yar /path/to/directory/ # Scan with metadata output yara -m GhostWriter_MicroBackdoor_72632_00001.yar target_file # Scan process memory (Linux) yara GhostWriter_MicroBackdoor_72632_00001.yar /proc/[pid]/exe
Integration Examples
Python (yara-python)
import yara
rules = yara.compile(filepath='GhostWriter_MicroBackdoor_72632_00001.yar')
matches = rules.match('/path/to/file')
ClamAV Integration
clamscan --yara-rules=GhostWriter_MicroBackdoor_72632_00001.yar /path/to/scan
Rule Information
YARA ID
YARA-2025-1438
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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