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

Static analysis result for SHA-256 cd57258684931fbb…

MALICIOUS

Office (OOXML) / .XLSX

2.15 MB Created: 2025-05-22 22:02:38 UTC Authoring application: Microsoft Excel 12.0000
MD5: 30ce2d95b3c38b4da9f848d4f11df0b9 SHA-1: acbc319211c77e2119e81ed0f90fc1f0ea08a9c4 SHA-256: cd57258684931fbbaeb60413939120b7ec08b81929a9eb662fb1446471700103
120 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

The sample is an Office document containing an embedded OLE object, specifically identified as Equation Editor. Critical heuristics indicate the presence of CVE-2017-11882, a known vulnerability in Equation Editor that allows for remote code execution. The embedded OLE object is likely the mechanism for exploiting this vulnerability, leading to the execution of a secondary payload.

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/gx.K5OCIS 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
a74d79099230b01024532e71d0fd056f973c19d204a8533bce516cbe716596dd		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/gx.K5OCIS 3027968 bytes

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