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

Static analysis result for SHA-256 2e871bd40e9d4340…

MALICIOUS

Office (OLE) / .XLS

141.1 KB Created: 1996-12-17 01:32:42 Authoring application: Microsoft Excel
MD5: 0f94ea28833308785192d88e700dca07 SHA-1: d01ab1ce7b215b7abb3349fe8e8b40bb645dc973 SHA-256: 2e871bd40e9d4340eb56e8d93221c96872fb5632c8ee718009e1f5d18f508d62
100 Risk Score

Malware Insights

MITRE ATT&CK
T1204.001 Malicious Link T1204.002 Malicious File

The sample is an Excel file exhibiting a critical CVE-2009-3129 vulnerability, indicating it's designed to exploit this flaw upon opening. The large slack space also suggests potential obfuscation or embedded malicious content. While no scripts were extracted, the presence of embedded URLs, some with unknown reputation, points towards a delivery mechanism for a secondary payload. The file's purpose is likely to exploit the CVE-2009-3129 vulnerability to execute arbitrary code.

Heuristics 3

  • 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 144,446 bytes but its declared streams total only 24,565 bytes — 119,881 bytes (83%) 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).
  • 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://www.pdf-repair.com
    • http://www.pdf-repair.com)/Producer(Advanced
    • http://www.pdf-repair.com)/ModDate(D:20100406171120+08
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://purl.org/dc/elements/1.1/

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