Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 a4e8ce52a8c96eb7…

MALICIOUS

Office (OLE)

126.2 KB Created: 2018-10-02 10:52:00 Authoring application: Microsoft Office Word First seen: 2019-05-31
MD5: 67bf991ebdb9bce9960d8e102b604bb9 SHA-1: 5630e4320d3470f972475292237f9335f077533d SHA-256: a4e8ce52a8c96eb78df13e52805ab21aa8a8ae748d20f4bbe123c27d75bb9d31
70 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1566.001 Spearphishing Attachment

The presence of a legacy WordBasic AutoOpen macro indicates an attempt to automatically execute code when the document is opened. While the VBA code itself is minimal, the AutoOpen marker is a strong indicator of malicious intent, likely to download and execute a second-stage 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 129,280 bytes but its declared streams total only 36,525 bytes — 92,755 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) 357 bytes
SHA-256: 66a7ed91627b521c7716c7b603d1e2146a2b22f8018dbec9a16ab2ee1fab4bcc
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "HTcojPoTOPX"
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 = "izmrbFTK"

Attribute VB_Name = "MZiDiIOVooJzSA"

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