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

Static analysis result for SHA-256 d13ca91157fe0486…

MALICIOUS

Office (OOXML) / .XLSX

742.8 KB Created: 2023-08-03 11:34:29 UTC Authoring application: Microsoft Excel 16.0300 First seen: 2023-08-17
MD5: 6de8cea2afbc1260af295d44818cd0bb SHA-1: 039a6239b96cc12f11ed3528738bd13ef7e3c50d SHA-256: d13ca91157fe0486aff1f5959c2f17d7cb2f3e541c2834b3ef86e39baf4d85c9
100 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.001 Malicious Link

The file is an Excel 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 exploitation of a vulnerability within the Equation Editor component. This is a common delivery mechanism for malicious payloads.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/5HBhJC.Ecwt 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
dabf534946a99f9188dc08515c8106eebe1dda43c5f3fdb0656a985f29ee1f8b		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/5HBhJC.Ecwt 1048064 bytes
ooxml_oleobject_00_ole10native_00.bin
09259743d35e8b41b639f2e031d322527714b2f9165375c38512956de80b1d71		 ole-package OOXML xl/embeddings/5HBhJC.Ecwt Ole10Native stream: olE10NAtIVe 1037645 bytes

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