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

Static analysis result for SHA-256 834da6143d94223b…

MALICIOUS

Office (OOXML) / .XLSX

1.97 MB Created: 2025-05-16 00:39:35 UTC Authoring application: Microsoft Excel 12.0000
MD5: 44e9ddff2513a7ab4d07d2d8c2aaf442 SHA-1: fb777a39a8a636af33c525f4c73d6963a68703c8 SHA-256: 834da6143d94223b48b207bfa0019552bf4a72b347be18dea4793b3e96396341
120 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

The critical heuristic firing for CVE-2017-11882 indicates the exploitation of a known vulnerability in the Equation Editor. This vulnerability is commonly used to execute arbitrary code, likely as a precursor to downloading and running a secondary payload. The presence of an embedded OLE object further supports this attack vector.

Heuristics 3

  • 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/2RGsAeAr.znC 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

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
ooxml_oleobject_00.bin
648010963f15c293e5c4218b2c034e9cd264fdabbdd755833f01b9687852c1e1		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/2RGsAeAr.znC 2796032 bytes

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