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

Static analysis result for SHA-256 4b7e6e35ac1835f3…

MALICIOUS

Office (OLE) / .XLS

210.8 KB Created: 1996-12-17 01:32:42 Authoring application: Microsoft Excel
MD5: 786c93a6d7481e6f624efed6dd999e1d SHA-1: 7de4b051f58f4553cc0f30629ee3bf68248933ad SHA-256: 4b7e6e35ac1835f3365b5fae9e56a64f8ffe37a9639775fa53d58ccea1f4eb97
180 Risk Score

Malware Insights

MITRE ATT&CK
T1204.002 Malicious File: User Execution T1059.003 Command and Scripting Interpreter: Windows Command Shell

The sample is a malicious Microsoft Excel file that exploits CVE-2009-3129, a known vulnerability in Excel's FEATHEADER record. This exploit allows for arbitrary code execution, indicated by suspicious cmd.exe invocation and PEB access. The large slack space in the OLE document is also a strong indicator of malicious intent, often used to hide exploit code.

Heuristics 5

  • 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.
  • PEB access via FS segment (x86) high SC_PEB_ACCESS
    PEB access via FS segment (x86)
  • Suspicious cmd.exe invocation with execution flag high SC_STR_CMD
    Suspicious cmd.exe invocation with execution flag
  • OLE document has large unaccounted-for region high OLE_SLACK_ANOMALY
    OLE file is 215,870 bytes but its declared streams total only 24,565 bytes — 191,305 bytes (89%) 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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