user@threatcheck.sh ~ threat-analysis
bash
$ analyze-threat Trojan:Win64/DonutLoader.GRR!MTB
Trojan:Win64/DonutLoader.GRR!MTB - Windows Defender threat signature analysis

Trojan:Win64/DonutLoader.GRR!MTB - Windows Defender Threat Analysis

$ cat analysis.txt
=== THREAT ANALYSIS REPORT ===
Threat Name: Trojan:Win64/DonutLoader.GRR!MTB
Classification:
Type:Trojan
Platform:Win64
Family:DonutLoader
Detection Type:Concrete
Known malware family with identified signatures
Variant:GRR
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 64-bit Windows platform, family DonutLoader

Summary:

Trojan:Win64/DonutLoader.GRR!MTB is a highly confident detection of a sophisticated Windows-based Trojan designed to inject malicious .NET assemblies into unmanaged processes. This threat acts as a loader, preparing the system for further compromise or delivery of additional payloads. Its detection leverages concrete signatures combined with machine learning behavioral analysis, indicating a high likelihood of active compromise and malicious intent.

Severity:
Critical
VDM Static Detection:
No specific strings found for this threat
YARA Rule:
rule Trojan_Win64_DonutLoader_GRR_2147945416_0
{
    meta:
        author = "threatcheck.sh"
        detection_name = "Trojan:Win64/DonutLoader.GRR!MTB"
        threat_id = "2147945416"
        type = "Trojan"
        platform = "Win64: Windows 64-bit platform"
        family = "DonutLoader"
        severity = "Critical"
        info = "MTB: Microsoft Threat Behavior"
        signature_type = "SIGNATURE_TYPE_PEHSTR_EXT"
        threshold = "1"
        strings_accuracy = "High"
    strings:
        $x_1_1 = {44 01 c2 0f b6 d2 44 29 c2 41 89 d3 48 63 d2 44 0f b6 04 14 46 88 04 14 88 0c 14 42 02 0c 14 0f b6 c9 0f b6 14 0c 30 13 48 83 c3 01 49 39 d9}  //weight: 1, accuracy: High
    condition:
        (filesize < 20MB) and
        (all of ($x*))
}
Known malware which is associated with this threat:
Filename: 0c0eb52c996d1ef6cdc71d1cd48e73cbd26eb01b6c971.exe
0c0eb52c996d1ef6cdc71d1cd48e73cbd26eb01b6c971cfc38c74db27f4b4eea
16/12/2025
→VirusTotal↓Download Sample
Remediation Steps:
Immediately isolate the affected system from the network to prevent further compromise. Remove all detected malicious files identified by Windows Defender. Perform a full system scan with updated antivirus software and investigate for any persistence mechanisms (e.g., startup entries, scheduled tasks). Implement patching for any identified vulnerabilities that may have been exploited and monitor for unusual network activity.
=== END REPORT ===
$ reanalyze-threat
This analysis was last updated on 16/12/2025. Do you want to analyze it again?
$ ls available-commands/
→ cd /home
user@threatcheck.sh:~$ ▊