Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 fed9383bf8d2e750…

MALICIOUS

Office (OLE)

111.2 KB Created: 2018-06-19 22:18:00 Authoring application: Microsoft Office Word First seen: 2018-09-04
MD5: 1fc6542a08f906066581e486d4931dd3 SHA-1: c2bec360e481382d1c5523fcb3e1c48a3fe8725e SHA-256: fed9383bf8d2e750ba1a2949ae91d8d68e3a7da73f818b605ca639833ee8ea93
70 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic

The file is an OLE document with a high slack anomaly, indicating potential obfuscation or padding. A legacy WordBasic auto-exec macro marker (AutoOpen) was detected, suggesting an attempt to automatically run malicious code upon opening. While the VBA project itself contains no executable statements, the presence of the auto-exec marker and the overall structure point towards a macro-based attack.

Heuristics 4

  • OLE document has large unaccounted-for region high OLE_SLACK_ANOMALY
    OLE file is 113,920 bytes but its declared streams total only 36,010 bytes — 77,910 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) 324 bytes
SHA-256: 0792dba6fe9847770a29e3212239e157a291ec9e99aa1b3902e6d4c817b1ee08
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "dRThTYqLGaQT"

Attribute VB_Name = "PDZSnjAlWarDk"
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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