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

Static analysis result for SHA-256 6fe2455917ae278e…

MALICIOUS

Office (OLE) / .X

61.5 KB Created: 1996-12-17 01:32:42 Authoring application: Microsoft Excel
MD5: 5892d7a1f3b390391ae184b3f1185e6f SHA-1: eb81faab72df0d04280916c36d1acfb7b0c17b10 SHA-256: 6fe2455917ae278e8a540d31f1b0e9dc3ec1b66d724ca1ea2ecce50d5fb20e24
100 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

The sample is an Excel file exhibiting a critical heuristic firing for CVE-2009-3129, indicating an exploitation for client execution. The OLE slack anomaly further suggests potential obfuscation or malicious padding within the file structure. No document body or script content was available for further analysis.

Heuristics 2

  • CVE-2009-3129 — Excel FEATHEADER record overflow critical CVE exact CVE_2009_3129
    Workbook BIFF stream contains a FEATHEADER (Feature Header) record with anomalous size (record_size=22, isf=4, cbHdrData=4). Legitimate FEATHEADER records are tiny (<100 bytes) and carry cbHdrData values that fit in the record body; the value here is the documented CVE-2009-3129 exploit primitive — cbHdrData drives a memcpy with attacker-controlled size, leading to memory corruption and code execution in Excel 2007/2003.
  • OLE document has large unaccounted-for region high OLE_SLACK_ANOMALY
    OLE file is 62,990 bytes but its declared streams total only 24,565 bytes — 38,425 bytes (61%) 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).

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