Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 0fda5d16ebdb2a6c…

MALICIOUS

Office (OLE)

125.0 KB Created: 2018-05-27 21:38:00 Authoring application: Microsoft Office Word First seen: 2019-01-20
MD5: 281744eb69c181be2dbfc8280a63cd26 SHA-1: c8420b4a937992e62185a25740e5871922c04811 SHA-256: 0fda5d16ebdb2a6cd8e66a37724a7d9708d50f5d112219c914820d91fe2f0f94
70 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic

The presence of a legacy WordBasic auto-exec marker (Autoopen) and a high slack space anomaly suggests the document is designed to execute embedded code. While the VBA project itself contains no executable statements, the Autoopen marker indicates a potential for legacy macro execution, which is a common vector for malware delivery. The benign URL found is likely a red herring or part of the document's structure.

Heuristics 4

  • OLE document has large unaccounted-for region high OLE_SLACK_ANOMALY
    OLE file is 128,000 bytes but its declared streams total only 36,234 bytes — 91,766 bytes (72%) 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) 320 bytes
SHA-256: 997392d1ebb1d0f107996d348857e8645cd9699da07164dba488929e05546fed
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "wKaHwQkwl"

Attribute VB_Name = "sjOwXDSZjUha"
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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