Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 bd103335c1cd3f7d…

MALICIOUS

Office (OLE)

308.0 KB Created: 2019-02-19 07:17:00 Authoring application: Microsoft Office Word First seen: 2019-04-18
MD5: 8b91740364a2db4c9d1a1986f98c8ceb SHA-1: 65d91e6ea6d839ae241e651eeeee87e04fdbaace SHA-256: bd103335c1cd3f7df7c4c46e46879c66f452202abb532da4d084e7d8a7c5d5d6
70 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic

The presence of a legacy WordBasic auto-exec marker ('autoopen') indicates the document is configured to automatically run malicious code upon opening. The OLE slack anomaly suggests potential obfuscation or padding within the file structure. While no specific second-stage payload was directly extracted, the auto-exec macro is a strong indicator of malicious intent.

Heuristics 4

  • OLE document has large unaccounted-for region high OLE_SLACK_ANOMALY
    OLE file is 315,392 bytes but its declared streams total only 149,805 bytes — 165,587 bytes (53%) 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) 313 bytes
SHA-256: 1ee209f0d74ae7a467bd13387d600f4a513bbaee688dc1311ea60163efefa538
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "w25126_3"
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

Attribute VB_Name = "E80102"

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