Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 791bd355c6f7a6bc…

MALICIOUS

Office (OLE)

81.5 KB Created: 2017-10-24 05:44:00 Authoring application: Microsoft Office Word First seen: 2020-05-25
MD5: 68b226ac21e55878dbedc4bd856a4237 SHA-1: 6b543f5aac817bbd905b4d27612c2d6d62d79e9b SHA-256: 791bd355c6f7a6bcec0cbd2a2bb2daa6e1922f7971c525b0b123cef4f8a679d1
70 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic

The presence of a legacy WordBasic auto-execution marker (AutoOpen) and a significant slack space anomaly in the OLE structure indicates potential malicious intent. While the VBA project itself contains no executable statements, the AutoOpen marker suggests an attempt to trigger legacy macro execution. The benign reputation of the embedded URL reduces confidence in direct malicious activity via that specific artifact.

Heuristics 4

  • OLE document has large unaccounted-for region high OLE_SLACK_ANOMALY
    OLE file is 83,456 bytes but its declared streams total only 36,246 bytes — 47,210 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) 318 bytes
SHA-256: 96921b95dbeb1d83e603b82b6a4f5c05466e2de5bd59fb37fc1ac94c63313bbd
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "ThisDocument"
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 = "Module1"

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