Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 3b2837e755cdb1ef…

MALICIOUS

Office (OLE)

73.5 KB Created: 2017-10-18 05:59:00 Authoring application: Microsoft Office Word First seen: 2017-10-28
MD5: e7492b29b05fe49611ef6d307ce601e5 SHA-1: 1062d570f85f3f87feeb92ea1908171c3262c9f6 SHA-256: 3b2837e755cdb1ef099fdc8bae9d0da534ca3bc14df63fcf7a04a1d5a8846d9b
70 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic

The presence of a legacy WordBasic AutoOpen macro (OLE_LEGACY_WORDBASIC_AUTOEXEC) indicates a likely attempt to execute malicious code upon opening the document. While the VBA project itself contains no executable statements, the AutoOpen marker suggests a malicious intent, possibly to download and execute a second-stage payload. The large slack space in the OLE structure is also suspicious.

Heuristics 4

  • OLE document has large unaccounted-for region high OLE_SLACK_ANOMALY
    OLE file is 75,264 bytes but its declared streams total only 36,246 bytes — 39,018 bytes (52%) 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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