Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 2e46f1604e37606b…

MALICIOUS

Office (OLE)

108.8 KB Created: 2018-06-19 15:53:00 Authoring application: Microsoft Office Word First seen: 2018-11-05
MD5: 056c4ac97ab76b7dcdfd584129c05566 SHA-1: 665cc03f0767da5e79e66741e2af4ec5c4e9f109 SHA-256: 2e46f1604e37606b94c4b55cc93b8b31be36777704c48753ab1705c365561002
70 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic

The presence of a legacy WordBasic auto-exec marker (AutoOpen) indicates an attempt to run malicious code when the document is opened. The significant slack space anomaly further suggests that the OLE structure has been manipulated, likely to hide malicious content. No specific malware family could be identified, and no executable scripts or network indicators were found.

Heuristics 4

  • OLE document has large unaccounted-for region high OLE_SLACK_ANOMALY
    OLE file is 111,361 bytes but its declared streams total only 36,095 bytes — 75,266 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) 325 bytes
SHA-256: a299321dd526ce48aab547fa7662c7eae19b2e29f6aced7bd5a6ac114d42b311
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "JYpwUAFjpdSoK"
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 = "KzTsUnohLacYL"

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