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

Trojan:MSIL/Taskun!rfn - Windows Defender Threat Analysis

$ cat analysis.txt
=== THREAT ANALYSIS REPORT ===
Threat Name: Trojan:MSIL/Taskun!rfn
Classification:
Type:Trojan
Platform:MSIL
Family:Taskun
Detection Type:Concrete
Known malware family with identified signatures
Suffix:!rfn
Specific ransomware family name
Confidence:Very High
False-Positive Risk:Low

Concrete signature match: Trojan - Appears legitimate but performs malicious actions for .NET (Microsoft Intermediate Language) platform, family Taskun

Summary:

This is a concrete detection of a Trojan designed to establish persistence, communicate with a command-and-control server (valhalla.ipdns.hu) for potential data exfiltration and further payload delivery, and attempts to evade detection by masquerading as legitimate software like an Adobe updater. It ensures execution on system startup by placing a malicious file (regchk.exe) in the Windows Startup folder.

Severity:
Critical
VDM Static Detection:
Relevant strings associated with this threat:
 - Kolko_i_krzyzyk.ResourceX (PEHSTR_EXT)
 - Airplane_Travelling.Properties.Resources (PEHSTR_EXT)
 - http://valhalla.ipdns.hu:80/regchk.exe (PEHSTR_EXT)
 - \Microsoft\Windows\Start Menu\Programs\StartUp\regchk.exe (PEHSTR_EXT)
 - gateway@valhalla.ipdns.hu:/home/gateway/upload/ (PEHSTR_EXT)
 - http://valhalla.ipdns.hu:80/put.php (PEHSTR_EXT)
 - C:\Documents and Settings\JohnDoe\Application Data\Adobeupdater.bin (PEHSTR_EXT)
 - QLCHApple_BUS.Properties.Resources (PEHSTR_EXT)
 - THDA_Group.Properties.Resources (PEHSTR_EXT)
 - PermissionViewer.Properties.Resources (PEHSTR_EXT)
 - QuanLyKhoHang.Properties.Resources (PEHSTR_EXT)
 - Do_an___Quan_ly_khach_san.Properties.Resources (PEHSTR_EXT)
 - Battleships.MainForm.resources (PEHSTR_EXT)
 - Hierarchy.Sample.Properties.Resources (PEHSTR_EXT)
 - Maps_Router.DangNhap (PEHSTR_EXT)
 - Maps_Router.AboutBox1.resources (PEHSTR_EXT)
 - Maps_Router.DangKy.resources (PEHSTR_EXT)
 - Maps_Router.ManHinhChinh.resources (PEHSTR_EXT)
 - DBConnectionUtility.Properties.Resources (PEHSTR_EXT)
 - ExecuteReader (PEHSTR_EXT)
 - Library.LibraryForm.resources (PEHSTR_EXT)
 - Assignment_7.Properties.Resources.resources (PEHSTR_EXT)
 - WindowBlindsClient.Properties.Resources.resources (PEHSTR_EXT)
 - exe (PEHSTR_EXT)
 - MaterialWinforms.Properties.Resources.resources (PEHSTR_EXT)
 - SuperAdventure.Pr (PEHSTR_EXT)
 - Marksheet_Project.Properties.Resources.resources (PEHSTR_EXT)
 - AmirCalendar.Properties.Resources (PEHSTR_EXT)
 - CalculadoraCientifica.Properties.Resources.resources (PEHSTR_EXT)
 - WordFun.Properties.Resources.resources (PEHSTR_EXT)
 - Oyunu.Properties.Resources.resources (PEHSTR_EXT)
 - StormCast.Properties.Resources.resource (PEHSTR_EXT)
 - BackEndLibrary.Properties.Resources.resources (PEHSTR_EXT)
 - Montero.dll (PEHSTR_EXT)
 - PharmaCare Manager.dll (PEHSTR_EXT)
 - HIPAA-compliant pharmacy management (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)
Known malware which is associated with this threat:
Filename: NewCustomerPurchaseOrderpdf.scr.exe
f4160d848ce8fc3d06604dbed868251d960839dc351673a5aec208ba48ebfc7e
19/01/2026
→VirusTotal↓Download Sample
Remediation Steps:
Immediately isolate the infected host. Perform a full system scan with updated antivirus software and remove all detected malicious files, specifically checking for 'Adobeupdater.bin' and 'regchk.exe' in user application data and startup directories. Block network communication to 'valhalla.ipdns.hu' at the firewall level and monitor for any residual activity or re-infection. Consider a system reimage for complete remediation.
=== END REPORT ===
$ reanalyze-threat
This analysis was last updated on 19/01/2026. Do you want to analyze it again?
$ ls available-commands/
→ cd /home
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