Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 79f69211c0f90c28…

MALICIOUS

Office (OLE)

319.8 KB Created: 2019-02-20 06:47:00 Authoring application: Microsoft Office Word First seen: 2019-04-18
MD5: b3371ed2551219193b1f5736790d3f14 SHA-1: 3eaf8cb718c6203cb8fb1033572087fa592c82bf SHA-256: 79f69211c0f90c28b270002c66b46bccc1b1a28228f1f8d80c88d24a0f4b29f5
70 Risk Score

Malware Insights

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

The presence of a legacy WordBasic auto-exec marker ('autoopen') strongly suggests the document is designed to automatically run malicious code upon opening. The OLE slack anomaly indicates potential obfuscation or padding within the file structure. While no explicit download URL was found, the auto-exec macro is a common precursor to downloading and executing further stages.

Heuristics 4

  • OLE document has large unaccounted-for region high OLE_SLACK_ANOMALY
    OLE file is 327,456 bytes but its declared streams total only 149,821 bytes — 177,635 bytes (54%) 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) 314 bytes
SHA-256: 3efb2bbd4d7648c9e316dcb82e92ac4ad7d9f390972819a1786d388f677d0cda
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "f_31851"
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 = "k_3513_3"

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