Malicious Office (OLE) / .XLS — malware analysis report

Static analysis result for SHA-256 a5065371aac337d1…

MALICIOUS

Office (OLE) / .XLS

72.6 KB Created: 2006-09-13 11:21:51 Authoring application: Microsoft Excel
MD5: 6f70c363aa6732f0718cb78f8aa2fdef SHA-1: df0e846a9d94d97292eb50bd4a7db1431f010a4e SHA-256: a5065371aac337d1e7eb2044eb4ea8e29e1949f561d801867f2796693ad10487
82 Risk Score

Malware Insights

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

This OLE document exhibits anomalies indicative of malicious intent, including a large unaccounted-for region and appended executable-looking payload bytes. Although VBA macros could not be extracted due to format issues, the presence of these indicators suggests the file is designed to deliver a secondary payload. The SHA256 hash is included as a primary IOC.

Heuristics 3

  • OLE document has large unaccounted-for region high OLE_SLACK_ANOMALY
    OLE file is 74,307 bytes but its declared streams total only 23,753 bytes — 50,554 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).
  • OLE file has appended executable-looking payload bytes high OLE_APPENDED_PAYLOAD
    OLE compound file contains a large high-entropy region beyond the declared major streams and that region includes shellcode, PE, or loader API markers. This is a payload-carrier signal, not a specific CVE attribution by itself.
  • Unsupported Office format for VBA extraction info OFFICE_FORMAT_UNSUPPORTED
    olevba could not extract VBA macros (PermissionError); format-agnostic byte-level scans still ran. Likely legacy, encrypted, or malformed OLE/OOXML — re-scanning the same bytes will yield the same outcome.

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
158e0c514a66f35365eccab22137253bf8127fdc2d792eec9f5cff9a027fdbe6		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 387 bytes

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