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

Static analysis result for SHA-256 0d6e0f4e4c611c10…

MALICIOUS

Office (OLE) / .XLS

85.4 KB Created: 1996-12-17 01:32:42 Authoring application: Microsoft Excel
MD5: 99129d01da8fe963e1fb22c2c59a6279 SHA-1: 6fa593be197c75716462893b669978f9768b0193 SHA-256: 0d6e0f4e4c611c10ec6bd30c5848bb7911ffaae1ef2df393ccfaf1295dbe7885
222 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

The file is a malicious Microsoft Excel spreadsheet that exploits CVE-2009-3129, a record overflow vulnerability. This exploit allows for arbitrary code execution, likely to download and run a second-stage payload. The presence of CreateProcess, LoadLibrary, and GetProcAddress API references further supports this. No specific family could be identified.

Heuristics 6

  • 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=23, isf=2, cbHdrData=4294967295). 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.
  • Reference to CreateProcess API high SC_STR_CREATEPROCESS
    Reference to CreateProcess API
  • Reference to LoadLibrary API high SC_STR_LOADLIBRARY
    Reference to LoadLibrary API
  • Reference to GetProcAddress API high SC_STR_GETPROCADDRESS
    Reference to GetProcAddress API
  • OLE document has large unaccounted-for region high OLE_SLACK_ANOMALY
    OLE file is 87,407 bytes but its declared streams total only 24,565 bytes — 62,842 bytes (72%) 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://crl.microsoft.com/pki/crl/products/tspca.crl0H
    • http://www.microsoft.com/pki/certs/tspca.crt0
    • http://crl.microsoft.com/pki/crl/products/WinIntPCA.crl0U
    • http://www.microsoft.com/pki/certs/MicrosoftWinIntPCA.crt0
    • http://update.microsoft.com/windowsupdate

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