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

Static analysis result for SHA-256 514266ecbe038932…

MALICIOUS

Office (OOXML) / .XLSX

14.2 KB Created: 2023-11-17 18:26:59 UTC Authoring application: Microsoft Excel 12.0000 First seen: 2024-05-22
MD5: b21f485299919357e9a90b9ab275d23a SHA-1: f70d73fd6646a872428f9082549aebfad445d371 SHA-256: 514266ecbe03893240e9d85f2d3ffdecc2ab09f1ac35cc312ee4112e02d24fe3
100 Risk Score

Malware Insights

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

The file is an Office document containing an embedded OLE object, specifically identified as an Equation Editor object. High-severity heuristics indicate a potential exploitation of CVE-2018-0798 due to an anomalous Equation Editor native stream. The document body content appears to be financial data, likely a lure to disguise the malicious payload within the embedded object.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/oleObject1.bin contains the Equation Editor CLSID, the legacy component exploited by CVE-2017-11882, CVE-2018-0802, and CVE-2018-0798.
  • CVE-2018-0798 — anomalous Equation Editor native stream high CVE likely CVE_2018_0798_EQUATION_NATIVE_ANOMALY
    Embedded Equation Editor OLE data contains anomalous native stream bytes consistent with a CVE-2018-0798-style Equation Editor exploit. This is treated as likely CVE evidence because the Equation object is malformed and payload-like, but it does not match the exact public matrix-overflow byte signature.
  • Embedded OLE object medium OOXML_OLE_OBJECT
    Document contains an embedded OLE object

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
ooxml_oleobject_00.bin
82357523857ceacc088292c2d4dfb2dd0315fa08d8eef1904dd19c19b8c96d3b		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/oleObject1.bin 4096 bytes
ooxml_oleobject_00_ole10native_00.bin
4e9b4010d14d16edfb8cb52c3a7a553653f01727d99044a2b6305fecb66dccb3		 ole-package OOXML xl/embeddings/oleObject1.bin Ole10Native stream: ole10nAtIVe 1639 bytes

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