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

Static analysis result for SHA-256 4324fb7f74b9273a…

MALICIOUS

Office (OLE) / .XLS

112.1 KB Created: 1996-12-17 01:32:42 Authoring application: Microsoft Excel
MD5: 0acbcdf081568b01be18abae59f30ee0 SHA-1: 31716033ec8ed5c373077f04155acf12bdb774f9 SHA-256: 4324fb7f74b9273a9e5b74314ceba986c4150b07271c8e314e1ea81e292dec04
120 Risk Score

Malware Insights

MITRE ATT&CK
T1059.003 Windows Command Shell

The sample is an OLE Excel file with a large amount of slack space, indicating potential obfuscation or embedded content. A high-severity heuristic detected a suspicious invocation of cmd.exe with an execution flag, suggesting the execution of arbitrary commands. Another heuristic noted PEB access, often used by malware to evade detection. While no document body text was available for context, the cmd.exe execution is a strong indicator of malicious intent, likely to download and execute a second-stage payload.

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 114,750 bytes but its declared streams total only 24,565 bytes — 90,185 bytes (79%) 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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