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

Static analysis result for SHA-256 852f2231a607fdb6…

MALICIOUS

Office (OLE) / .XLS

289.6 KB Created: 1996-12-17 01:32:42 Authoring application: Microsoft Excel
MD5: d705c0b12fd949c0c837468b92c73bb9 SHA-1: b38e967aaf7a665344f6c3d744796a657d765e72 SHA-256: 852f2231a607fdb6d1ad6ee87e771dfaad913cfb49dc7e78312cba30262a3cb9
160 Risk Score

Malware Insights

MITRE ATT&CK
T1204.002 Malicious File T1566.001 Spearphishing Attachment

The sample is an Excel spreadsheet exhibiting a large amount of slack space and triggering critical heuristics for CVE-2009-3129 (Excel FEATHEADER record overflow) and the presence of an embedded Adobe Flash (SWF) file. The embedded URL 'http://saty-home.com/' is also present. These indicators suggest the file is designed to exploit a vulnerability to download and execute a secondary payload.

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.
  • Embedded Adobe Flash (SWF) in OLE document critical OFFICE_EMBEDDED_SWF
    Document contains an embedded Adobe Flash (SWF) object. Vulnerabilities such as CVE-2018-4878 and CVE-2018-15982 involved Flash objects embedded in Office files. Adobe Flash has been end-of-life since December 2020.
  • OLE document has large unaccounted-for region high OLE_SLACK_ANOMALY
    OLE file is 296,535 bytes but its declared streams total only 24,565 bytes — 271,970 bytes (92%) 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://saty-home.com/

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