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

Static analysis result for SHA-256 a4376752d0d41d28…

MALICIOUS

Office (OLE) / .XLS

86.6 KB Created: 1996-12-17 01:32:42 Authoring application: Microsoft Excel
MD5: 202c32085d7c37866e684fbc60c3f352 SHA-1: 88233258f135c5b0930ce4218282966e1cb55070 SHA-256: a4376752d0d41d281454f8acd16f0d7c662eba27b5c7848b17a9384e62d78cae
120 Risk Score

Malware Insights

MITRE ATT&CK
T1059.003 Windows Command Shell T1204.002 Malicious File

The sample is an OLE Excel file with a large slack space anomaly, indicating potential obfuscation or embedded content. A suspicious invocation of cmd.exe with an execution flag was detected, suggesting the execution of arbitrary commands. While no specific script was extracted, the presence of embedded URLs, some of which are unknown, points towards a potential download or redirection mechanism. The PEB access heuristic further supports the possibility of malicious code execution.

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 88,638 bytes but its declared streams total only 24,565 bytes — 64,073 bytes (72%) 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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