Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 da84b9c210e26a66…

MALICIOUS

Office (OLE)

144.0 KB Created: 2018-05-22 10:53:00 Authoring application: Microsoft Office Word First seen: 2019-08-04
MD5: 66fcea94e46b5b86b3bb5bac009d2323 SHA-1: 7efc77b3c10aecd57edbf627eaf67cbeb6727ddf SHA-256: da84b9c210e26a66201a44916c51b1e7c5582c31b4bce37a6dae5d0018b67cfd
70 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic

The presence of a legacy WordBasic auto-exec macro (Autoopen) indicates a potential for malicious execution upon opening the document. The large slack space in the OLE structure is also suspicious. While the VBA project itself contains no executable statements, the legacy marker suggests older, potentially more dangerous macro functionality is present. The embedded URL was confirmed benign and is likely a false positive or part of the document's legitimate structure.

Heuristics 4

  • OLE document has large unaccounted-for region high OLE_SLACK_ANOMALY
    OLE file is 147,456 bytes but its declared streams total only 35,692 bytes — 111,764 bytes (76%) 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: ee513f9df1de23bbb6c4ead8f257c9efea87790265df80cb5e272f14f31adfa0
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "jQVzALI"
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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