Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 3a91abc1a263c89e…

MALICIOUS

Office (OLE)

205.5 KB Created: 2018-06-22 14:45:00 Authoring application: Microsoft Office Word First seen: 2019-01-11
MD5: 30fcba5dca7bf27aa5a37d2f070eecb4 SHA-1: 72d82806589aeb7f81bc0ee5569df13ab33a4c8c SHA-256: 3a91abc1a263c89ea506c267618dab2bd90fbf20fa84b27ae224d6f3386a2545
70 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic

The sample contains a legacy WordBasic auto-exec macro marker (AutoOpen), indicating an attempt to run malicious code when the document is opened. The VBA project itself is minimal, but the presence of the auto-exec marker is a strong indicator of malicious intent. 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 210,432 bytes but its declared streams total only 107,260 bytes — 103,172 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) 363 bytes
SHA-256: 51e7fe41f3faef4cd908998ac2404b30e7d76a0db9aa2b027499b1d3b91cad6f
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "pjucnCivuGkn"

Attribute VB_Name = "EuXhfwhPrNiAo"

Attribute VB_Name = "SSFwsJuwMNlmzF"
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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