Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 9dc73ff63c1b8687…

MALICIOUS

Office (OLE)

272.0 KB Created: 2019-02-20 06:47:00 Authoring application: Microsoft Office Word First seen: 2019-05-10
MD5: f9f5fd6d0e97e3999832ef2c2f426f45 SHA-1: 3328d24dd1cfbcc58cc314d028be05db3b01e17d SHA-256: 9dc73ff63c1b868724f099b598a79e4bd8ee8e1236d020776eeb10ecf701a3f8
70 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic

The presence of an Excel 4.0 macro sheet (OLE_XLM_AUTOOPEN) indicates an attempt to execute code upon opening. The OLE slack anomaly suggests potential obfuscation or padding. While the VBA project itself contains no executable statements, the XLM macro is the primary indicator of malicious intent, likely to download and execute a second-stage payload.

Heuristics 4

  • OLE document has large unaccounted-for region high OLE_SLACK_ANOMALY
    OLE file is 278,528 bytes but its declared streams total only 149,707 bytes — 128,821 bytes (46%) 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).
  • Excel 4.0 (XLM) macro sheet present medium OLE_XLM_AUTOOPEN
    Workbook contains an Excel 4.0 macro sheet sub-stream — XLM is rarely seen in modern legitimate workbooks and was a major Office malware vector during 2020-2022.
  • 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) 281 bytes
SHA-256: 7dd257ab743563911588c9cdc72cb8c4482ce002d431150006e534601df6baeb
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

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