Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 1f6ac0e16ffd5a68…

MALICIOUS

Office (OLE)

110.0 KB Created: 2018-06-20 16:48:00 Authoring application: Microsoft Office Word First seen: 2019-04-17
MD5: 227bc3fb595675515af5aae28b0d696b SHA-1: 94f446a8aeb515e54797039e099b8f7f938fc513 SHA-256: 1f6ac0e16ffd5a6879eb2ed6c82e480e0c2e7fb723c591382f17162e7ef0884a
70 Risk Score

Malware Insights

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

The presence of the 'AutoOpen' marker in the legacy WordBasic macro indicates an attempt to automatically execute code when the document is opened. While the VBA project itself contains no executable statements, the legacy marker suggests a potential for malicious behavior. The large slack space in the OLE structure is also suspicious and could be used to hide malicious content.

Heuristics 4

  • OLE document has large unaccounted-for region high OLE_SLACK_ANOMALY
    OLE file is 112,640 bytes but its declared streams total only 35,873 bytes — 76,767 bytes (68%) 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) 285 bytes
SHA-256: 838ce51b84de76016b86abf420a4e57467be6b6f516c519cc6c012b487a86c61
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "MwvQXlFYLAM"
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

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