user@threatcheck.sh ~ threat-analysis
bash
$ analyze-threat Virus:Win32/Expiro.HNW!MTB
Virus:Win32/Expiro.HNW!MTB - Windows Defender threat signature analysis

Virus:Win32/Expiro.HNW!MTB - Windows Defender Threat Analysis

$ cat analysis.txt
=== THREAT ANALYSIS REPORT ===
Threat Name: Virus:Win32/Expiro.HNW!MTB
Classification:
Type:Virus
Platform:Win32
Family:Expiro
Detection Type:Concrete
Known malware family with identified signatures
Variant:HNW
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: Virus - Infects other files for 32-bit Windows platform, family Expiro

Summary:

Virus:Win32/Expiro.HNW!MTB is a concrete detection of a variant from the Expiro family, a potent file infector targeting Windows 32-bit systems. This malware modifies legitimate executable files by injecting its malicious code, often leading to file corruption and system instability, and was identified through machine learning behavioral analysis.

Severity:
Critical
VDM Static Detection:
Relevant strings associated with this threat:
 - .symtab (PEHSTR_EXT)
 - .rsrc (PEHSTR_EXT)
 - @.reloc (PEHSTR_EXT)
 - @.rsrc (PEHSTR_EXT)
 - &#</security></tr (PEHSTR_EXT)
 - stInfo></assembly> (PEHSTR_EXT)
 - #</dependency> (PEHSTR_EXT)
 - </assembly> (PEHSTR_EXT)
 - #</assembly (PEHSTR_EXT)
YARA Rule:
rule Virus_Win32_Expiro_HNW_2147936833_0
{
    meta:
        author = "threatcheck.sh"
        detection_name = "Virus:Win32/Expiro.HNW!MTB"
        threat_id = "2147936833"
        type = "Virus"
        platform = "Win32: Windows 32-bit platform"
        family = "Expiro"
        severity = "Critical"
        info = "MTB: Microsoft Threat Behavior"
        signature_type = "SIGNATURE_TYPE_PEHSTR_EXT"
        threshold = "5"
        strings_accuracy = "Low"
    strings:
        $x_5_1 = {2e 73 79 6d 74 61 62 00 ?? ?? ?? ?? ?? ?? ?? ?? ?? ?? ?? ?? ?? ?? ?? ?? 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 e2}  //weight: 5, accuracy: Low
    condition:
        (filesize < 20MB) and
        (all of ($x*))
}
Known malware which is associated with this threat:
Filename: 8016128677ac23f729d07a97813f476ad5043dd29d30f6522d9fa386f4b57db7
8016128677ac23f729d07a97813f476ad5043dd29d30f6522d9fa386f4b57db7
08/12/2025
→VirusTotal↓Download Sample
Remediation Steps:
Immediately isolate the affected system to prevent further spread. Perform a full system scan with updated antivirus software and remove or quarantine all detected threats. Due to its file-infector nature, legitimate applications that were infected may need to be restored from clean backups or reinstalled.
=== END REPORT ===
$ reanalyze-threat
This analysis was last updated on 08/12/2025. Do you want to analyze it again?
$ ls available-commands/
→ cd /home
user@threatcheck.sh:~$ ▊