Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 7aafc5f38a7a440b…

MALICIOUS

Office (OLE)

199.0 KB Created: 2018-05-21 13:10:00 Authoring application: Microsoft Office Word First seen: 2019-01-12
MD5: 768d948d6a8bf1fea4c0bbf65ebe3032 SHA-1: 727301db73fc7ae6450e82b3958ac551eadfd300 SHA-256: 7aafc5f38a7a440b33afda628cb15cfba29eece499c29d0062338be758d08b86
70 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic

The sample contains a legacy WordBasic auto-exec macro, indicated by the 'Autoopen' marker. The large slack space in the OLE structure suggests potential obfuscation or hidden content. While the VBA code itself is minimal, the presence of the auto-exec marker strongly implies an attempt to run malicious code upon opening the document.

Heuristics 4

  • OLE document has large unaccounted-for region high OLE_SLACK_ANOMALY
    OLE file is 203,776 bytes but its declared streams total only 36,119 bytes — 167,657 bytes (82%) live in unallocated sector slack. This is the canonical hiding place for pre-macro-era Office exploit payloads (XOR-encoded shellcode reached via a parser pointer-corruption bug in the document structure).
  • 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.
  • VBA project contains no executable statements low OLE_VBA_MACROS
    Document contains a VBA project, but extracted modules only contain attributes/options/comments and no executable statements.
  • 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)

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas vba-macro oletools.olevba.extract_macros (decoded VBA source) 281 bytes
SHA-256: 193be19d9763a6166e3b5a3af0292258ac0ac7a912651b1a0da3943bd29ea881
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "EzHGczd"
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

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