user@threatcheck.sh ~ threat-analysis
bash
$ analyze-threat Trojan:Win32/Lockscreen.AMMD!MTB
Trojan:Win32/Lockscreen.AMMD!MTB - Windows Defender threat signature analysis

Trojan:Win32/Lockscreen.AMMD!MTB - Windows Defender Threat Analysis

$ cat analysis.txt
=== THREAT ANALYSIS REPORT ===
Threat Name: Trojan:Win32/Lockscreen.AMMD!MTB
Classification:
Type:Trojan
Platform:Win32
Family:Lockscreen
Detection Type:Concrete
Known malware family with identified signatures
Variant:AMMD
Specific signature variant within the malware family
Suffix:!MTB
Detected via machine learning and behavioral analysis
Detection Method:Behavioral
Confidence:Very High
False-Positive Risk:Low

Concrete signature match: Trojan - Appears legitimate but performs malicious actions for 32-bit Windows platform, family Lockscreen

Summary:

This threat is a lockscreen trojan designed to render a system unusable by locking the user out. It overwrites the Master Boot Record (MBR) and terminates critical system processes to prevent user recovery, effectively holding the computer hostage.

Severity:
Medium
VDM Static Detection:
Relevant strings associated with this threat:
 - C:\MBR.bin (PEHSTR_EXT)
 - C:\Users\Public\monkeiii.dll (PEHSTR_EXT)
 - /c TASKKILL /F /FI "Imagename ne (PEHSTR_EXT)
 - AntiWinLockerTray.exe (PEHSTR_EXT)
YARA Rule:
rule Trojan_Win32_Lockscreen_AMMD_2147905528_0
{
    meta:
        author = "threatcheck.sh"
        detection_name = "Trojan:Win32/Lockscreen.AMMD!MTB"
        threat_id = "2147905528"
        type = "Trojan"
        platform = "Win32: Windows 32-bit platform"
        family = "Lockscreen"
        severity = "Critical"
        info = "MTB: Microsoft Threat Behavior"
        signature_type = "SIGNATURE_TYPE_PEHSTR_EXT"
        threshold = "12"
        strings_accuracy = "High"
    strings:
        $x_2_1 = "WINLOCKBYAMPBYAMPBYAMPfsdjf" ascii //weight: 2
        $x_2_2 = "C:\\MBR.bin" ascii //weight: 2
        $x_2_3 = "DisableChangePassword" ascii //weight: 2
        $x_2_4 = "C:\\Users\\Public\\monkeiii.dll" ascii //weight: 2
        $x_2_5 = "/c TASKKILL /F /FI \"Imagename ne" ascii //weight: 2
        $x_2_6 = "AntiWinLockerTray.exe" ascii //weight: 2
    condition:
        (filesize < 20MB) and
        (all of ($x*))
}
Known malware which is associated with this threat:
Filename: Plaguecheat_Crack.exe
8a17462c08ceeb2a307fe0e1a467107ee4c9c801db7e021d12eebb0a9722efdf
22/11/2025
→VirusTotal↓Download Sample
Remediation Steps:
Isolate the endpoint from the network immediately. Boot from Windows Recovery Media to repair the Master Boot Record using the 'bootrec /fixmbr' command. After restoring boot functionality, perform a full antivirus scan from a safe environment to remove the dropped files (MBR.bin, monkeiii.dll).
=== END REPORT ===
$ reanalyze-threat
This analysis was last updated on 22/11/2025. Do you want to analyze it again?
$ ls available-commands/
→ cd /home
user@threatcheck.sh:~$ ▊