Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 5a7527926184fceb…

MALICIOUS

Office (OLE)

78.5 KB First seen: 2017-10-28
MD5: 4e2c2ca5d6c7378b60c32feb620c6428 SHA-1: b254bf72b8bc0da8e480c3752f4657b49631e468 SHA-256: 5a7527926184fceb8a17130cb6c2a4ac678618ba2a9b19ae8cdf8300fc1ddb61
70 Risk Score

Malware Insights

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

The presence of the OLE_LEGACY_WORDBASIC_AUTOEXEC heuristic indicates the document contains an AutoOpen macro, a legacy method for automatic execution in older Word versions. This macro is likely intended to initiate a malicious chain of execution, potentially downloading further stages. The large slack space in the OLE structure is also suspicious and may be used to hide malicious content.

Heuristics 4

  • OLE document has large unaccounted-for region high OLE_SLACK_ANOMALY
    OLE file is 80,423 bytes but its declared streams total only 36,132 bytes — 44,291 bytes (55%) 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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