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

Static analysis result for SHA-256 32c0fadd6baf3118…

MALICIOUS

Office (OLE) / .XLS

102.1 KB Created: 1996-12-17 01:32:42 Authoring application: Microsoft Excel
MD5: 2249f75401c355afec34f3ef1a44a5f7 SHA-1: 0e06620cf6d636172592d3495ef322d828e5db14 SHA-256: 32c0fadd6baf3118f3fb1c32f1c2cb0045808a378155e54b2a7595a85e7bb220
140 Risk Score

Malware Insights

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

The sample is an Excel file that triggers a critical heuristic for CVE-2009-3129, indicating an exploit targeting a known Excel vulnerability. The presence of embedded URLs, some of which are unknown and potentially malicious, suggests a delivery mechanism for a secondary payload. The large slack space in the OLE document is also a common characteristic of weaponized Office files.

Heuristics 4

  • 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)
  • OLE document has large unaccounted-for region high OLE_SLACK_ANOMALY
    OLE file is 104,510 bytes but its declared streams total only 24,565 bytes — 79,945 bytes (76%) 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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