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

Static analysis result for SHA-256 cd22f77c3eeb63b0…

MALICIOUS

Office (OLE) / .XLS

90.6 KB Created: 1996-12-17 01:32:42 Authoring application: Microsoft Excel
MD5: c85d0d025da91b33d8b16cd10723ebff SHA-1: b4e4bf6469aeb7bf6263407ed567fdd80ce7f2b5 SHA-256: cd22f77c3eeb63b059f43342726ff48346f7e1f992093d70ce2bd59ec813f1e3
180 Risk Score

Malware Insights

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

The file is an Excel spreadsheet that contains a critical heuristic indicating exploitation of CVE-2009-3129, a known vulnerability in Microsoft Excel. This exploit likely allows for arbitrary code execution. Additionally, suspicious cmd.exe invocation and PEB access heuristics suggest further malicious activity. The presence of embedded URLs, though mostly benign, warrants attention.

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 92,734 bytes but its declared streams total only 24,565 bytes — 68,169 bytes (74%) 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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