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

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

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

This threat is a file-infecting virus from the Expiro family, detected via behavioral analysis. It spreads by injecting its code into other executable files on the system, which can lead to widespread compromise, credential theft, and backdoor access for attackers.

Severity:
Medium
VDM Static Detection:
No specific strings found for this threat
YARA Rule:
rule Virus_Win32_Expiro_EB_2147852592_0
{
    meta:
        author = "threatcheck.sh"
        detection_name = "Virus:Win32/Expiro.EB!MTB"
        threat_id = "2147852592"
        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_2_1 = {50 51 52 53 55 56 57 e8 00 00 00 00}  //weight: 2, accuracy: High
        $x_3_2 = {c0 08 00 0f 85 0f 00 81 ?? 00 04 00 00 81 ?? 00 04 00 00 81}  //weight: 3, accuracy: Low
        $x_3_3 = {c0 08 00 74 05 0f 00 81 ?? 00 04 00 00 81 ?? 00 04 00 00 81}  //weight: 3, accuracy: Low
        $x_3_4 = {c0 08 00 0f 84 0f 00 81 ?? 00 04 00 00 81 ?? 00 04 00 00 81}  //weight: 3, accuracy: Low
    condition:
        (filesize < 20MB) and
        (
            ((1 of ($x_3_*) and 1 of ($x_2_*))) or
            ((2 of ($x_3_*))) or
            (all of ($x*))
        )
}
Known malware which is associated with this threat:
Filename: 58b2d3d5d53877494e8ebcc07fe3b5bb0b50e3501e6aa.exe
58b2d3d5d53877494e8ebcc07fe3b5bb0b50e3501e6aa46c8e84ccdacab1d818
20/11/2025
→VirusTotal↓Download Sample
Remediation Steps:
Isolate the machine from the network to prevent further spread. Run a full, offline antivirus scan using a bootable rescue disk. Since this virus steals credentials and infects system files, change all passwords and consider reimaging the system from a trusted backup to ensure complete removal.
=== END REPORT ===
$ reanalyze-threat
This analysis was last updated on 20/11/2025. Do you want to analyze it again?
$ ls available-commands/
→ cd /home
user@threatcheck.sh:~$ ▊