Malicious Office (OOXML) / .XLSX — malware analysis report

Static analysis result for SHA-256 0a192f7365cbe905…

MALICIOUS

Office (OOXML) / .XLSX

942.9 KB Created: 2023-01-19 05:24:18 UTC Authoring application: Microsoft Excel 16.0300 First seen: 2023-03-30
MD5: d27da9380b8318ffafdfaaa073ff2406 SHA-1: e4e27bde230da7a68cc5b533c56e76fb8685da55 SHA-256: 0a192f7365cbe905554c04c199ecd43d31ea21e5aa2939eace22b59e29715319
122 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution T1559.001 Component Object Model and Distributed Component Object Model

The critical heuristic firing for CVE-2017-11882 indicates the file contains an embedded Equation Editor OLE object designed to exploit a known vulnerability. This vulnerability allows for arbitrary code execution when the object is activated. The presence of an embedded OLE object and the specific Equation Editor exploit strongly suggest a malicious intent to compromise the user's system.

Heuristics 4

  • CVE-2017-11882 — Equation Editor FONT record overflow critical CVE likely CVE_2017_11882
    Equation Editor MTEF contains an overlong FONT typeface field, the vulnerable copy primitive for CVE-2017-11882. This is stronger evidence than the Equation Editor CLSID alone because it identifies the malformed record that drives code execution in EQNEDT32.EXE.
  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/3J.U5 contains the Equation Editor CLSID, the legacy component exploited by CVE-2017-11882, CVE-2018-0802, and CVE-2018-0798.
  • Embedded OLE object medium OOXML_OLE_OBJECT
    Document contains an embedded OLE object
  • Suspicious extracted artifact info EXTRACTED_FILE_STATIC_TRIAGE
    One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
ooxml_oleobject_00.bin
f5f7f05718b7adb937b5c88608bcabddcc61deee2ca22dbbf4c0f6886f217e51		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/3J.U5 1203712 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact entropy is 7.51, consistent with packed or encrypted content.

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