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

Static analysis result for SHA-256 890d12572b384f35…

MALICIOUS

Office (OLE) / .XLS

128.5 KB Created: 1996-10-14 23:33:28 Authoring application: Microsoft Excel
MD5: 128857d29604320d0e36486c4c9a834b SHA-1: f72b92b24de1d9d66963e49a4bb019a900699262 SHA-256: 890d12572b384f3585be0912b3b7386907e10f0ba2adfbbc8db8b3dacd0364b0
82 Risk Score

Malware Insights

MITRE ATT&CK
T1204 Malicious Link T1204.002 Malicious File

The file is an OLE document with a significant amount of slack space, indicating potential obfuscation or embedded malicious content. It also exhibits characteristics related to CVE-2009-0556, a known vulnerability. Although VBA macros could not be extracted, the combination of these factors suggests the file is designed to exploit a vulnerability, likely for payload delivery.

Heuristics 3

  • PowerPoint OffArray-style record stub — CVE-2009-0556 related high CVE related PPT_CVE_2009_0556_RELATED
    Small embedded PowerPoint Document stream contains the sparse record set associated with OffArray-style exploit stubs and lacks normal text/placeholder atoms. This is CVE-2009-0556-family evidence, reported as related until the malformed OffArray field is validated directly.
  • OLE document has large unaccounted-for region high OLE_SLACK_ANOMALY
    OLE file is 131,584 bytes but its declared streams total only 15,628 bytes — 115,956 bytes (88%) 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).
  • 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.

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