Office (OOXML) / .XLSX malware analysis — malicious · 35d611603e9252da

MALICIOUS

Office (OOXML) / .XLSX

654.4 KB Created: 2023-08-03 11:34:29 UTC Authoring application: Microsoft Excel 16.0300 First seen: 2023-08-24

MD5: ae0e99530ea9843215a930ca7d1fde38 SHA-1: 749378b217aa93e2b294968ac4c0f50b5e997613 SHA-256: 35d611603e9252da0a878ff49e877f2cd17b30b81ca785619a83c65061484709

100 Risk Score

Malware Insights

MITRE ATT&CK

T1566.002 Spearphishing Attachment T1204.002 Malicious File

The file is an OOXML document 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 it's used to exploit a vulnerability. This technique is commonly used to deliver second-stage malware.

Heuristics 3

Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR

Embedded OLE object xl/embeddings/jD2Lzah.qx6tkeu 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.

Filename	Kind	Source	Size
`ooxml_oleobject_00.bin` `262bfdfe9391e85549b025780f4af7be62e2f96ddabb91cda5256d204d1b57db`	ooxml-ole-object	OOXML embedded OLE part: xl/embeddings/jD2Lzah.qx6tkeu	896512 bytes
`ooxml_oleobject_00_ole10native_00.bin` `9328367304cfdf63f69738cc6ca2f6b57c23dfdc9aeafc205b4b92f90da2867a`	ole-package	OOXML xl/embeddings/jD2Lzah.qx6tkeu Ole10Native stream: oLe10NAtIVe	886907 bytes

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