Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 846c33a39f248f33…

MALICIOUS

Office (OLE)

92.8 KB Created: 2018-06-24 20:56:00 Authoring application: Microsoft Office Word First seen: 2019-01-12
MD5: 9e145f0765f838db8957ca6e5606bffb SHA-1: 2a68878266ed2d73f60713fe591f9ae61ebc276c SHA-256: 846c33a39f248f33808fd07696509663640f94d609f0f5c10620082e7161a2b3
70 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic

The sample is an OLE document with a high slack anomaly, indicating potential obfuscation or embedded malicious content. A legacy WordBasic auto-exec macro marker, 'AutoOpen', was detected, suggesting an attempt to run malicious code when the document is opened. No other executable code or network indicators were found.

Heuristics 4

  • OLE document has large unaccounted-for region high OLE_SLACK_ANOMALY
    OLE file is 94,976 bytes but its declared streams total only 35,129 bytes — 59,847 bytes (63%) 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) 284 bytes
SHA-256: 302bc19de945ea820c2bcfc12e1121ebeb7b202d71f726776f0b0da29016392c
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "QdITzZNNNA"
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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