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

Trojan:Win32/Zusy.HNB!MTB - Windows Defender Threat Analysis

$ cat analysis.txt
=== THREAT ANALYSIS REPORT ===
Threat Name: Trojan:Win32/Zusy.HNB!MTB
Classification:
Type:Trojan
Platform:Win32
Family:Zusy
Detection Type:Concrete
Known malware family with identified signatures
Variant:HNB
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 Zusy

Summary:

Trojan:Win32/Zusy.HNB!MTB is a sophisticated Windows Trojan detected via machine learning behavioral analysis. It utilizes various built-in Windows utilities (LOLBINs) like PowerShell, mshta, regsvr32, and rundll32 for execution and persistence, alongside capabilities for API hooking, data encoding, remote file operations, and scheduled tasks, aiming for system control and potential data exfiltration.

Severity:
Medium
VDM Static Detection:
Relevant strings associated with this threat:
 - /new/net_api (PEHSTR_EXT)
 - powershell -Command  (PEHSTR_EXT)
 - !#HSTR:StringCodeForMshta.A!pli (PEHSTR_EXT)
 - !#HSTR:StringCodeForHooking.C!pli (PEHSTR_EXT)
 - !#HSTR:StringCodeForHooking.D!pli (PEHSTR_EXT)
 - !#HSTR:StringCodeForHooking.L!pli (PEHSTR_EXT)
 - !#HSTR:StringCodeForHooking.O!pli (PEHSTR_EXT)
 - !#HSTR:StringCodeForRegsvr32.A!pli (PEHSTR_EXT)
 - !#HSTR:StringCodeForRundll32.A!pli (PEHSTR_EXT)
 - rundll32 (PEHSTR_EXT)
 - !#HSTR:StringCodeForBITSJobs.A!pli (PEHSTR_EXT)
 - !#HSTR:StringCodeForPowerShell.G!pli (PEHSTR_EXT)
 - !#HSTR:StringCodeForScheduledTask.A!pli (PEHSTR_EXT)
 - !#HSTR:StringCodeForDataEncoding.D!pli (PEHSTR_EXT)
 - !#HSTR:StringCodeForHooking.J!pli (PEHSTR_EXT)
 - !#HSTR:StringCodeForHooking.K!pli (PEHSTR_EXT)
 - !#HSTR:StringCodeForRemoteFileCopy.B!pli (PEHSTR_EXT)
 - !#HSTR:ExecutionGuardrails (PEHSTR_EXT)
 - !#HSTR:StringCodeForFileDeletion.A!pli (PEHSTR_EXT)
 - !#HSTR:StringCodeForHooking.M!pli (PEHSTR_EXT)
 - !#HSTR:StringCodeForNetshHelperDLL.A!pli (PEHSTR_EXT)
 - !#HSTR:StringCodeForRemoteServices.A!pli (PEHSTR_EXT)
YARA Rule:
rule Trojan_Win32_Zusy_HNB_2147908515_0
{
    meta:
        author = "threatcheck.sh"
        detection_name = "Trojan:Win32/Zusy.HNB!MTB"
        threat_id = "2147908515"
        type = "Trojan"
        platform = "Win32: Windows 32-bit platform"
        family = "Zusy"
        severity = "Critical"
        info = "MTB: Microsoft Threat Behavior"
        signature_type = "SIGNATURE_TYPE_PEHSTR_EXT"
        threshold = "1"
        strings_accuracy = "Low"
    strings:
        $x_1_1 = {00 43 00 68 00 72 00 6f 00 6d 00 65 00 2f 00 31 00 32 00 31 00 2e 00 30 00 2e 00 30 00 2e 00 30 00 20 00 53 00 61 00 66 00 61 00 72 00 69 00 2f 00 35 00 33 00 37 00 2e 00 33 00 36 00 00 00 68 00 74 00 74 00 70 00 3a 00 2f 00 2f 00 [0-6] 2e 00 [0-6] 2e 00 [0-6] 2e 00 [0-6] 2f 00}  //weight: 1, accuracy: Low
        $x_1_2 = {00 25 00 74 00 65 00 6d 00 70 00 25 [0-5] 25 00 73 00 5c 00 25 00 64 00 25 00 64 00 2e 00 65 00 78 00 65 00 00 00 4d 00 6f 00 7a 00 69 00 6c 00 6c 00 61 00}  //weight: 1, accuracy: Low
        $x_1_3 = "23t43f4ft23f423t43f4ft23f423t43f" ascii //weight: 1
    condition:
        (filesize < 20MB) and
        (1 of ($x*))
}
Known malware which is associated with this threat:
Filename: spml.exe
1bdbb46e7a4722311e5baefa1eb48cfca30581f1ee597a84b5b43e67f2f2470b
26/01/2026
→VirusTotal↓Download Sample
Filename: spl2.exe
5b5e85f9aaddc637b944a78fe390c93d21fa4ffadd953dc7a9412b658d9b15f0
05/01/2026
→VirusTotal↓Download Sample
Remediation Steps:
Immediately isolate the affected system to prevent further spread. Perform a full system scan with updated antivirus/EDR, investigate for persistence mechanisms (e.g., scheduled tasks, registry entries, startup items), and patch any vulnerable software. Implement strong access controls and user education to prevent similar infections.
=== END REPORT ===
$ reanalyze-threat
This analysis was last updated on 05/01/2026. Do you want to analyze it again?
$ ls available-commands/
→ cd /home
user@threatcheck.sh:~$ ▊