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

Static analysis result for SHA-256 766b0c706ef63411…

MALICIOUS

Office (OLE) / .XLS

97.1 KB
MD5: af3d2f6cb7df013feeee6d7735a0fb79 SHA-1: 1ba6486afe9c8562a06890813e211a77cd236d28 SHA-256: 766b0c706ef634118371fe8425d35a8492489c84f8f84503b4c819c90fa1b265
202 Risk Score

Malware Insights

MITRE ATT&CK
T1059.003 Windows Command Shell T1566.001 Spearphishing Attachment

The file is an OLE document exhibiting anomalies such as a large slack space and an appended executable payload. Heuristics indicate a NOP sled, PEB access, and a suspicious invocation of cmd.exe, suggesting an attempt to execute malicious code. The presence of appended executable bytes and the cmd.exe invocation strongly indicate the file is designed to download and execute a second-stage payload.

Heuristics 6

  • NOP sled detected high SC_NOP_SLED
    Found 20+ consecutive 0x90 bytes
  • 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 99,390 bytes but its declared streams total only 12,288 bytes — 87,102 bytes (88%) 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).
  • OLE file has appended executable-looking payload bytes high OLE_APPENDED_PAYLOAD
    OLE compound file contains a large high-entropy region beyond the declared major streams and that region includes shellcode, PE, or loader API markers. This is a payload-carrier signal, not a specific CVE attribution by itself.
  • 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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