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

Trojan:MSIL/AgentTesla.SJ!MTB - Windows Defender Threat Analysis

$ cat analysis.txt
=== THREAT ANALYSIS REPORT ===
Threat Name: Trojan:MSIL/AgentTesla.SJ!MTB
Classification:
Type:Trojan
Platform:MSIL
Family:AgentTesla
Detection Type:Concrete
Known malware family with identified signatures
Variant:SJ
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 .NET (Microsoft Intermediate Language) platform, family AgentTesla

Summary:

This detection identifies Trojan:MSIL/AgentTesla.SJ!MTB, a sophisticated .NET-based infostealer and remote access trojan. It exhibits capabilities for extensive system compromise including process hooking for data theft (e.g., keylogging), establishing persistence using system utilities (rundll32, regsvr32, mshta, scheduled tasks), and exfiltrating data via BITS jobs and remote file operations.

Severity:
Critical
VDM Static Detection:
Relevant strings associated with this threat:
 - FolderSearcher.Form1.resources (PEHSTR_EXT)
 - QuanLyBanGiay.CCM (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_MSIL_AgentTesla_SJ_2147756279_0
{
    meta:
        author = "threatcheck.sh"
        detection_name = "Trojan:MSIL/AgentTesla.SJ!MTB"
        threat_id = "2147756279"
        type = "Trojan"
        platform = "MSIL: .NET intermediate language scripts"
        family = "AgentTesla"
        severity = "Critical"
        info = "MTB: Microsoft Threat Behavior"
        signature_type = "SIGNATURE_TYPE_PEHSTR_EXT"
        threshold = "4"
        strings_accuracy = "High"
    strings:
        $x_2_1 = {00 08 17 58 13 06 07 08 07 08 91 28 15 00 00 06 08 1f 16 5d 91 61 07 11 06 09 5d 91 59 20 00 01 00 00 58 20 ff 00 00 00 5f d2 9c 08 17 58 0c 00 08 09 fe 04 13 07 11 07 2d c6}  //weight: 2, accuracy: High
        $x_2_2 = "FolderSearcher.Form1.resources" ascii //weight: 2
    condition:
        (filesize < 20MB) and
        (all of ($x*))
}
Known malware which is associated with this threat:
Filename: Carta de Apoio - ED 01-2601000216-(103)-17201 docx.exe
1f6409653cb9163caee32ecc1652b8f7a778f44c492e6c74ca652505c37313d8
26/01/2026
→VirusTotal↓Download Sample
Filename: Audit Form.exe
3b74f2bc2c5f52c9c6d9a4ccec72a5dc9ff7a1676c17483c1b734d91ff06a2f5
22/01/2026
→VirusTotal↓Download Sample
Filename: HALKBANK.pdf.exe
468b7d7df75898e6cb22d0964283e2b080a40cda5aaf55d83e72c504c03ffb00
13/01/2026
→VirusTotal↓Download Sample
Filename: Halkbank Ekstre--pdf.exe
c695505c3cbe55b147b4c44f9290cc6594a2452792aaab1474b01bdd0a7f7a94
13/01/2026
→VirusTotal↓Download Sample
Remediation Steps:
Immediately isolate the affected host from the network to prevent further spread or data exfiltration. Perform a full system scan with updated antivirus software to ensure complete removal of the threat. Crucially, reset all credentials (user accounts, network shares, applications, and browser-saved passwords) that were present on or accessible from the compromised system, as AgentTesla is designed to steal sensitive information. Review system and network logs for any signs of lateral movement or data exfiltration.
=== END REPORT ===
$ reanalyze-threat
This analysis was last updated on 13/01/2026. Do you want to analyze it again?
$ ls available-commands/
→ cd /home
user@threatcheck.sh:~$ ▊