Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 41fcc2ba97f49b61…

MALICIOUS

Office (OLE)

206.4 KB Created: 2019-02-25 05:27:00 Authoring application: Microsoft Office Word First seen: 2019-12-09
MD5: 84b4615baebae8dc7f730777293a8dab SHA-1: 47284314014eef7465ee4d039b77ef27df989e23 SHA-256: 41fcc2ba97f49b610fb4d22ef94a864edc47f83c48425f9d6c2bf5f59b08b94d
70 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1566.001 Spearphishing Attachment

The presence of a legacy WordBasic auto-exec marker ('autoopen') and a VBA macro indicates an attempt to run malicious code upon opening the document. The large slack space in the OLE structure is also suspicious. While the VBA code itself is minimal, the auto-exec marker strongly suggests the intent to download and execute a secondary payload, characteristic of a macro-based downloader.

Heuristics 4

  • OLE document has large unaccounted-for region high OLE_SLACK_ANOMALY
    OLE file is 211,328 bytes but its declared streams total only 107,762 bytes — 103,566 bytes (49%) 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: 3f102b634b7c7075a983c7e1ffd6e7e683c27a9936cd5d5c2f82e1a81e028075
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "c6_9_2"
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 = "R930_4_"

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