Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 ad62fd116b8d023b…

MALICIOUS

Office (OLE)

156.5 KB Created: 2017-11-28 15:08:00 Authoring application: Microsoft Office Word First seen: 2018-02-07
MD5: 8d500fa8dd4fbe0619307fb5cef74b71 SHA-1: fdba420c037fe5fc84fb57e0c9cd08488e6687b7 SHA-256: ad62fd116b8d023bdfef726574b8356c09abc31cd51ce9f117182419b8606eb5
70 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic

The sample is a malicious OLE document containing a legacy WordBasic auto-exec macro, indicated by the AutoOpen marker. The document body is heavily obfuscated and contains embedded binary data, suggesting it is not intended for direct user interaction. The presence of a 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 160,256 bytes but its declared streams total only 24,601 bytes — 135,655 bytes (85%) 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) 286 bytes
SHA-256: 7771bf99b1125ee0f87040a7dc7c1fa89eec2186bbf4ab3e822c8d665693af47
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "ThisDocument"
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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