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

Static analysis result for SHA-256 967bad97761462af…

MALICIOUS

Office (OOXML) / .XLSX

718.1 KB Created: 2023-07-26 19:45:53 UTC Authoring application: Microsoft Excel 12.0000 First seen: 2023-08-15
MD5: 38c542d48707d4865e75ce6bf5caac05 SHA-1: 152b07bf5a82e93c5ff89823318aa46c41e1846b SHA-256: 967bad97761462afa55ca360040d55cdbcfbf019c9c68672ad8a1cfa1d05de3a
100 Risk Score

Malware Insights

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

The sample is an Excel file containing an embedded OLE object, specifically identified as a Microsoft Equation Editor object. High-severity heuristics indicate that this Equation Editor object carries a payload-like Ole10Native stream with an anomalous size, strongly suggesting exploitation of a known vulnerability like CVE-2017-11882. This technique is commonly used to download and execute a second-stage payload.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/DU3ecNL9H.BLrDg65 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
f374954b367b0b3b36fb25456fe30c98574734374a3a93a953be7885d4ba941a		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/DU3ecNL9H.BLrDg65 1054208 bytes
ooxml_oleobject_00_ole10native_00.bin
1e7b5d2611c9cc8558f4f33ae44fb98aa5783b0e4cb17abf281895480e613e5c		 ole-package OOXML xl/embeddings/DU3ecNL9H.BLrDg65 Ole10Native stream: OLe10NATIVE 1043061 bytes

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