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

Static analysis result for SHA-256 a30a2725cdf769e6…

MALICIOUS

Office (OOXML) / .XLSX

1.97 MB Created: 2025-04-16 03:58:07 UTC Authoring application: Microsoft Excel 12.0000 First seen: 2025-05-14
MD5: 0b56c45c683557089b72ff1dc816be85 SHA-1: 70e44c87da4eacd048e6d278cd29b457b4040bb8 SHA-256: a30a2725cdf769e6ae2ee30e10b89c1cbdb832ca3ec301a18a5942cec24c7d76
140 Risk Score

Malware Insights

MITRE ATT&CK
T1204 User Execution T1204.002 Malicious File T1559 Component Object Model Hijacking T1559.001 Component Object Model Hijacking

The sample is an OOXML document containing an embedded OLE object that exploits CVE-2017-11882 via the Equation Editor. The document body contains a lure instructing the user to 'click Enable editing', indicating a social engineering attempt to bypass security measures. The exploitation of CVE-2017-11882 is a known method for executing arbitrary code, likely to download and run a second-stage payload.

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/MWZW.2TbpX 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
  • Macro/content-enable lure medium SE_ENABLE_LURE
    Document instructs the user to enable macros or editing — a common technique used by malware droppers to bypass Office macro security settings

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
ooxml_oleobject_00.bin
838de5a87da5ac64366771a9bd401e94da8c2a915d3b70ae76764b8779230a53		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/MWZW.2TbpX 2771968 bytes

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