user@threatcheck.sh ~ threat-analysis
bash
$ analyze-threat Trojan:VBS/AgentTesla.BC!MTB
Trojan:VBS/AgentTesla.BC!MTB - Windows Defender threat signature analysis

Trojan:VBS/AgentTesla.BC!MTB - Windows Defender Threat Analysis

$ cat analysis.txt
=== THREAT ANALYSIS REPORT ===
Threat Name: Trojan:VBS/AgentTesla.BC!MTB
Classification:
Type:Trojan
Platform:VBS
Family:AgentTesla
Detection Type:Concrete
Known malware family with identified signatures
Variant:BC
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 VBScript platform, family AgentTesla

Summary:

This is a concrete detection of the AgentTesla information-stealing Trojan, delivered via a VBScript file. The malware is designed to steal credentials and other sensitive data by hooking system functions and using common system utilities for execution. It also creates scheduled tasks to maintain persistence on the compromised machine.

Severity:
High
VDM Static Detection:
Relevant strings associated with this threat:
 - IHMVB.My (PEHSTR)
 - CompareString (PEHSTR_EXT)
 - CompareMethod (PEHSTR_EXT)
Relevant strings associated with this threat:
 - !#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)
No specific strings found for this threat
YARA Rule:
rule Trojan_MSIL_AgentTesla_BC_2147758507_0
{
    meta:
        author = "threatcheck.sh"
        detection_name = "Trojan:MSIL/AgentTesla.BC!MTB"
        threat_id = "2147758507"
        type = "Trojan"
        platform = "MSIL: .NET intermediate language scripts"
        family = "AgentTesla"
        severity = "Critical"
        info = "MTB: Microsoft Threat Behavior"
        signature_type = "SIGNATURE_TYPE_PEHSTR"
        threshold = "3"
        strings_accuracy = "High"
    strings:
        $x_1_1 = "IHMVB.My" ascii //weight: 1
        $x_1_2 = "C116CFCD5F95FD7E94993F490F21111BF17DB9FD240788F7024CCBFA45B63E0C" ascii //weight: 1
        $x_1_3 = "$e4076bfd-a50e-4244-9f1a-9b7df0ed5202" ascii //weight: 1
    condition:
        (filesize < 20MB) and
        (all of ($x*))
}
Known malware which is associated with this threat:
71a9ff27e61eb20f7ff682a892b2ebe794404febc59df035e4720559f16f0b70
07/11/2025
→VirusTotal↓Download Sample
Remediation Steps:
Isolate the endpoint from the network immediately. Perform a full antivirus scan to remove the threat. Reset all user passwords and credentials that were used or stored on the device, as they are likely compromised. Investigate the initial access vector and check for persistence mechanisms like scheduled tasks.
=== END REPORT ===
$ reanalyze-threat
This analysis was last updated on 08/11/2025. Do you want to analyze it again?
$ ls available-commands/
→ cd /home
user@threatcheck.sh:~$ ▊