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

Static analysis result for SHA-256 34f8253044bab88d…

MALICIOUS

Office (OOXML) / .XLSX

2.15 MB Created: 2025-08-18 05:08:49 UTC Authoring application: Microsoft Excel 12.0000
MD5: b5df75005ce9779f15a85425394e588a SHA-1: 44811efff44086d5447aea98de90b6eaf89be466 SHA-256: 34f8253044bab88dfb7fcafabf0f782eb7fa1eff991d141ee2c8723dd4e223a0
120 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

The sample is an Excel file containing an embedded OLE object that exploits the CVE-2017-11882 vulnerability in Equation Editor. This vulnerability allows for arbitrary code execution, likely to download and run a second-stage payload. The embedded object's filename is noted as an IOC.

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/eYiEbxwZn.3AWXeTT 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
368392d9f30ace4d0e984912098855f49f7d4fbf8c85dcda0afe236f5e7169e5		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/eYiEbxwZn.3AWXeTT 3025920 bytes

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