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

Static analysis result for SHA-256 f320809e891a66c0…

MALICIOUS

Office (OOXML) / .XLSX

709.2 KB Created: 2023-07-26 10:53:55 UTC Authoring application: Microsoft Excel 12.0000 First seen: 2023-07-27
MD5: 90848091ebe973561e0443b487729dbf SHA-1: 49d00c3267c659f56965e14f18c67cc484e1a5a8 SHA-256: f320809e891a66c0897987a76f804ad05aaa360812726150115af6f818e794b4
100 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious File

The sample is an Office document containing an embedded OLE object, specifically identified as a Equation Editor object. High-severity heuristics indicate that this Equation Editor object carries a payload-like Ole10Native stream with an anomalous size and entropy, strongly suggesting it's a dropper for a secondary exploit or malware. The embedded object's path and stream name are logged as IOCs.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/H4I2wYeo.opd9Vd contains the Equation Editor CLSID, the legacy component exploited by CVE-2017-11882, CVE-2018-0802, and CVE-2018-0798.
  • Equation Editor object carries payload-like Ole10Native stream high OLE_EQUATION_OLE10NATIVE_PAYLOAD_ANOMALY
    Embedded OLE object declares the Equation Editor CLSID but stores a large high-entropy Ole10Native stream with malformed package sizing. This is an exploit-shaped Equation/OLE payload container seen in malicious OOXML samples. It is not assigned to a specific CVE unless the MTEF/Equation Native primitive also matches.
  • 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
6620e4d2a6f30178ef184fe58b7762ed5850b6a71ae93eb0df7c6c8059c6a3f1		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/H4I2wYeo.opd9Vd 1053696 bytes
ooxml_oleobject_00_ole10native_00.bin
40d52541036566e9e7fc961b3c3814027e1674edeb058810c932feea3e0af0f5		 ole-package OOXML xl/embeddings/H4I2wYeo.opd9Vd Ole10Native stream: OlE10nATIVE 1042572 bytes

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