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

Static analysis result for SHA-256 112a94a45baec2b7…

MALICIOUS

Office (OOXML) / .XLSX

685.9 KB Created: 2023-07-26 19:45:53 UTC Authoring application: Microsoft Excel 12.0000 First seen: 2023-08-05
MD5: 5bec9acfe138442ee89c6af73e7ab6ec SHA-1: 7e1b127e2d052fa81ccf7810dd2a5ffe8d169fb5 SHA-256: 112a94a45baec2b7d421b908b721cf7c2a3a067f014f9a4adae4343ebb636988
100 Risk Score

Malware Insights

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

The sample is an OOXML 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 header and size discrepancy, strongly suggesting exploitation of a known Equation Editor vulnerability. 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/pFAn0T.TNG 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
d2ed6ee3873d7eec74818e32cb5d851747d56cec04e340cc2eb5a9d7b436985d		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/pFAn0T.TNG 986112 bytes
ooxml_oleobject_00_ole10native_00.bin
82012673d91ffff0867e02675a60616a01ee14bf1c24c035d06ce1245daecc03		 ole-package OOXML xl/embeddings/pFAn0T.TNG Ole10Native stream: OLE10nAtiVE 975513 bytes

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