Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 999c234d7d26e0fa…

MALICIOUS

Office (OLE)

106.0 KB Created: 2018-06-20 07:01:00 Authoring application: Microsoft Office Word First seen: 2019-05-31
MD5: 3b56d6ff45fdea38139617ed18a7c5e0 SHA-1: 11e50f3274ac0653dcc84daffe7c17ee431aa503 SHA-256: 999c234d7d26e0faee474d6e3c8722143bf45135a5bf26ffaed212db11e4fafd
70 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic

The presence of a legacy WordBasic AutoOpen marker indicates the document is configured to automatically execute a macro when opened. While the VBA project itself contains no executable statements, the AutoOpen marker is a strong indicator of malicious intent, likely to download and execute 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 108,544 bytes but its declared streams total only 36,431 bytes — 72,113 bytes (66%) 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: 9294eaaa174c932997e8b0158841243a135984b4d231cea5af7b03dcb8927cb1
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "rAzWVtS"
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 = "jmpJVPTbDEXHPl"

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