Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 e03698b0a346745c…

MALICIOUS

Office (OLE)

111.5 KB Created: 2018-05-28 10:30:00 Authoring application: Microsoft Office Word First seen: 2018-11-05
MD5: 08cb06b04d8068ad171b12589eea7348 SHA-1: 9d68cbc6c291c988b004fa1d59301bf4ae8fa569 SHA-256: e03698b0a346745cb536ccdbead423f0fc81dc70bded742bd466b88635e8d902
70 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic

The sample contains a legacy WordBasic Autoopen macro marker, suggesting an attempt to automatically execute code upon opening. While the VBA project itself contains no executable statements, the presence of the Autoopen marker and a significant amount of slack space in the OLE structure are suspicious. The embedded URL was confirmed as benign and no other executable scripts were found.

Heuristics 4

  • OLE document has large unaccounted-for region high OLE_SLACK_ANOMALY
    OLE file is 114,176 bytes but its declared streams total only 36,620 bytes — 77,556 bytes (68%) 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) 321 bytes
SHA-256: 21dd19ff17292fabb86cfb29302a04f66e1a2611a13d9fd2372273f659f83a53
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "phRaaUTMW"
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 = "OFwAKXMGwNzSN"

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