Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 30341bc6fdae4c65…

MALICIOUS

Office (OLE)

90.1 KB Created: 2018-09-20 18:02:00 Authoring application: Microsoft Office Word First seen: 2019-05-31
MD5: 9f16d85be30a12e2ade4c0f698ff157f SHA-1: ee893fd51516a1059650f0d09310496cbf89bf21 SHA-256: 30341bc6fdae4c659ea9d72e4748243ba9e75b9caeb06e5b977268221d529a7f
70 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic

The sample is a malicious OLE document containing a legacy WordBasic auto-exec macro named 'AutoOpen'. This macro is designed to run automatically when the document is opened, indicating an attempt to execute malicious code. The presence of a large slack space anomaly further suggests potential obfuscation or packed content within the OLE structure.

Heuristics 4

  • OLE document has large unaccounted-for region high OLE_SLACK_ANOMALY
    OLE file is 92,288 bytes but its declared streams total only 36,537 bytes — 55,751 bytes (60%) 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) 326 bytes
SHA-256: bda9895d59f26434dc97ceee46be70970b1415b96c1d21bbc73e191989d176c1
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "LjCfsKUvAHuEVq"
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 = "ULTosJXDtERlH"

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