Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 5e4e559a82333311…

MALICIOUS

Office (OLE)

327.1 KB Created: 2019-02-20 07:25:00 Authoring application: Microsoft Office Word First seen: 2019-08-04
MD5: 31788f55bc9c9ff7a6603a11fd454d64 SHA-1: 14e2eed1b04d9a43df54ea9adfdaf37f0b2e2f0f SHA-256: 5e4e559a823333113ec0e9bc735298fe7b1ed4d0e0926ef5c9085fef4eb027e7
70 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic

The presence of a legacy WordBasic auto-exec macro (autoopen) strongly suggests an attempt to execute malicious code upon opening the document. The large slack space in the OLE structure is also indicative of obfuscation or packed content. While no specific payload URL or execution command was directly extracted, the autoopen marker is a high-confidence indicator of malicious intent.

Heuristics 4

  • OLE document has large unaccounted-for region high OLE_SLACK_ANOMALY
    OLE file is 334,976 bytes but its declared streams total only 149,809 bytes — 185,167 bytes (55%) 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) 314 bytes
SHA-256: b14b7803487f1ceda2e7f126835b89e2824d2d724dab49d6a57aee70f159dde5
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "M___9_17"
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 = "R279943"

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