Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 ba8635e393dc722f…

MALICIOUS

Office (OLE)

319.8 KB Created: 2019-02-20 06:47:00 Authoring application: Microsoft Office Word First seen: 2019-10-01
MD5: 8bbd2d0593524ff0adac3a69021b6975 SHA-1: 06a33c12b3f2c6a1c2e50d8745a7e5eb1dec0b14 SHA-256: ba8635e393dc722f8c7a90c2110a87625c7c1fb908fac446c8114f27b06fbd0d
70 Risk Score

Malware Insights

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

The presence of a legacy WordBasic auto-exec marker (autoopen) indicates an attempt to automatically run code upon opening the document. While the VBA project itself contains no executable statements, the marker suggests a potential for legacy macro execution. The embedded URL, though benign, points to a common technique for luring users. 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 327,456 bytes but its declared streams total only 149,821 bytes — 177,635 bytes (54%) 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) 314 bytes
SHA-256: 3efb2bbd4d7648c9e316dcb82e92ac4ad7d9f390972819a1786d388f677d0cda
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "f_31851"
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 = "k_3513_3"

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