Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 2852cf744f5b4a1d…

MALICIOUS

Office (OLE)

179.0 KB Created: 2018-05-21 18:06:00 Authoring application: Microsoft Office Word First seen: 2019-04-18
MD5: c83479f78dd3f538f60915f79c559357 SHA-1: 994e868196ad564841deaced6ce5c9b763028058 SHA-256: 2852cf744f5b4a1d16eefcf4a2dba9a3bd1daa281304af28658774221d95ed82
70 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic

The presence of a legacy WordBasic Autoopen macro indicates the document is designed to automatically execute code when opened. While the VBA project itself contains no executable statements, the Autoopen marker is a strong indicator of malicious intent. The large slack space in the OLE structure may be used to hide malicious content.

Heuristics 4

  • OLE document has large unaccounted-for region high OLE_SLACK_ANOMALY
    OLE file is 183,296 bytes but its declared streams total only 36,278 bytes — 147,018 bytes (80%) 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: a1cc81232efff7f2f3999caf0eeed3cc0318ebb199b3fbcb4bd1ae6bf088fcd7
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "dbjmuzZFWV"
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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