Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 9f7a2b6e37bed82a…

MALICIOUS

Office (OLE)

336.4 KB Created: 2019-02-20 10:31:00 Authoring application: Microsoft Office Word First seen: 2020-02-04
MD5: 81562114aef9cd7f72e854742847a8aa SHA-1: ab0ff4b7abbee941e1dc57b4cbef82cade7c6af6 SHA-256: 9f7a2b6e37bed82a103bed95e1c4f7f851ca5ea7c7201617484db6817750987a
70 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic

The presence of a legacy WordBasic auto-exec macro (autoopen) indicates an attempt to execute code automatically when the document is opened. The large slack space in the OLE structure is also suspicious and may be used to hide malicious content. No specific payload or network activity was directly observed from the provided evidence.

Heuristics 4

  • OLE document has large unaccounted-for region high OLE_SLACK_ANOMALY
    OLE file is 344,448 bytes but its declared streams total only 149,813 bytes — 194,635 bytes (57%) 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) 312 bytes
SHA-256: c0b9ab29fd95786ceca4bc89c9f93d66b528a165b1957f0276ef7436935a4978
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "B62548"
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 = "v8_3688"

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