user@threatcheck.sh ~ threat-analysis
bash
$ analyze-threat Ransom:Win64/Lockbit.AC!MTB
Ransom:Win64/Lockbit.AC!MTB - Windows Defender threat signature analysis

Ransom:Win64/Lockbit.AC!MTB - Windows Defender Threat Analysis

$ cat analysis.txt
=== THREAT ANALYSIS REPORT ===
Threat Name: Ransom:Win64/Lockbit.AC!MTB
Classification:
Type:Ransom
Platform:Win64
Family:Lockbit
Detection Type:Concrete
Known malware family with identified signatures
Variant:AC
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: Ransomware - Encrypts files and demands payment for 64-bit Windows platform, family Lockbit

Summary:

This is a concrete detection of Ransom:Win64/Lockbit.AC, a specific variant of the highly dangerous Lockbit ransomware family. It indicates the presence of a malicious program designed to encrypt files on the compromised system for extortion, identified through specific byte patterns derived from machine learning behavioral analysis.

Severity:
Critical
VDM Static Detection:
No specific strings found for this threat
YARA Rule:
rule Ransom_Win64_Lockbit_AC_2147845572_0
{
    meta:
        author = "threatcheck.sh"
        detection_name = "Ransom:Win64/Lockbit.AC!MTB"
        threat_id = "2147845572"
        type = "Ransom"
        platform = "Win64: Windows 64-bit platform"
        family = "Lockbit"
        severity = "Critical"
        info = "MTB: Microsoft Threat Behavior"
        signature_type = "SIGNATURE_TYPE_PEHSTR_EXT"
        threshold = "1"
        strings_accuracy = "High"
    strings:
        $x_1_1 = {f7 e9 03 d1 c1 fa 06 8b c2 c1 e8 1f 03 d0 6b c2 7f 2b c8 b8 09 04 02 81 83 c1 7f f7 e9 03 d1 c1 fa 06 8b c2 c1 e8 1f 03 d0 6b c2 7f 2b c8 88 4c 3c 41 48 ff c7 48 83 ff 16 72}  //weight: 1, accuracy: High
        $x_1_2 = {f7 e9 03 d1 c1 fa 06 8b c2 c1 e8 1f 03 d0 6b c2 7f 2b c8 b8 09 04 02 81 83 c1 7f f7 e9 03 d1 c1 fa 06 8b c2 c1 e8 1f 03 d0 6b c2 7f 2b c8 42 88 4c 05 b8 49 ff c0 49 83 f8 0d 72}  //weight: 1, accuracy: High
    condition:
        (filesize < 20MB) and
        (1 of ($x*))
}
Known malware which is associated with this threat:
Filename: ThermoCalc2026a-CrackedBy-DoCrackMe.exe.exe
99b41a3ffef3e2d26ad47f46e616dae81b3991c3705a7892a92e2ffd74307658
19/08/2026
→VirusTotal↓Download Sample
Remediation Steps:
Immediately isolate the affected system from the network. Use a reputable antivirus/EDR solution to thoroughly scan and remove the threat. Restore data from recent, clean backups. Implement robust security measures including patching vulnerabilities, enforcing strong authentication, and educating users on phishing and social engineering tactics to prevent future infections.
=== END REPORT ===
$ reanalyze-threat
This analysis was last updated on 19/08/2026. Do you want to analyze it again?
$ ls available-commands/
→ cd /home
user@threatcheck.sh:~$ ▊