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

Static analysis result for SHA-256 a15f8621efc5eca9…

MALICIOUS

Office (OLE) / .XLS

93.6 KB Created: 1996-12-17 01:32:42 Authoring application: Microsoft Excel
MD5: 6c2bf10a453bdd51139bc03b56066f84 SHA-1: ccf19dcefced87db711085cba300adca0b0dd7c8 SHA-256: a15f8621efc5eca960a0c493ef718d3711be0ec30d8af9872fb45568ca8080ba
120 Risk Score

Malware Insights

MITRE ATT&CK
T1059.003 Windows Command Shell

The sample is an OLE Excel spreadsheet exhibiting a large slack space anomaly, indicative of potential obfuscation or embedded malicious content. It triggers heuristics for suspicious command-line execution ('cmd.exe') and PEB access, suggesting an attempt to run external commands or evade detection. The embedded URLs, while mostly benign, include references to 'pdf-repair.com', which could be a lure. The combination of these factors points to a downloader or initial access mechanism.

Heuristics 4

  • 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 95,806 bytes but its declared streams total only 24,565 bytes — 71,241 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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