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

Static analysis result for SHA-256 783d371e003a08b7…

MALICIOUS

Office (OOXML) / .XLSX

2.08 MB Created: 2025-06-12 13:12:50 UTC Authoring application: Microsoft Excel 12.0000
MD5: b41a5aabef373e1fe06ff9eb5995b6f9 SHA-1: 1040727a7bf1dc03c6b2c7526625aad714e3bc91 SHA-256: 783d371e003a08b7169899ede0dec2b069ec54b664ebdd016f4b3abf184cda4d
120 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The sample contains an embedded OLE object that exploits the CVE-2017-11882 vulnerability. This vulnerability is known to be used for arbitrary code execution. The presence of this exploit indicates a high likelihood of malicious intent, aiming to compromise the user's system upon opening the document.

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/4h.D2rhgxP 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
89874d77ff4b7696c538b5164dbcc9c362d44a82a3b3d247433c4dfa1b57eb9a		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/4h.D2rhgxP 2897408 bytes

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