Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 274647f5d08f2ee7…

MALICIOUS

Office (OLE)

81.0 KB Created: 2017-11-11 00:00:00 Authoring application: Microsoft Office Word First seen: 2018-02-07
MD5: 4e7c135a4d6545cbc43a87e95d4fb350 SHA-1: 0a8b854ecca4f43dad492a630158e0e54e263974 SHA-256: 274647f5d08f2ee7179a0e580f880fa053ac7a03deb567500f3fb183b929b8d1
70 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic

The sample is an OLE document containing a legacy WordBasic auto-exec macro named 'AutoOpen'. This heuristic firing suggests the document is designed to automatically run malicious code upon opening. The VBA project itself contains no executable statements, but the presence of the AutoOpen marker is a strong indicator of malicious intent, likely involving the execution of a secondary payload. 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 82,944 bytes but its declared streams total only 35,462 bytes — 47,482 bytes (57%) 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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