Office (OOXML) / .XLSX malware analysis — malicious · 349d5687fa42837c

MALICIOUS

Office (OOXML) / .XLSX

618.5 KB Created: 2010-06-04 08:55:28 UTC Authoring application: Microsoft Excel 15.0300 First seen: 2022-08-17

MD5: 7e7136d19d00f222871c2e85f850f146 SHA-1: 135ecef32905b6f0f6b62a99bdc7d0f83c07dc9e SHA-256: 349d5687fa42837c2852797be0d5ef15118638769ce2329f4b5505753545359e

100 Risk Score

Malware Insights

MITRE ATT&CK

T1559.001 Component Object Model T1204.002 Malicious File

The file is an OOXML document containing an embedded OLE object, specifically identified as a Microsoft Equation Editor object. Heuristics indicate that this Equation Editor object carries a payload-like Ole10Native stream with an anomalous header, suggesting exploitation of a vulnerability. The document body contains text that appears to be a purchase order, likely serving as a lure to disguise the malicious nature of the embedded object.

Heuristics 3

Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR

Embedded OLE object xl/embeddings/Qbdky47u.4zzs 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` `3d56ceea853312c11c96c714d623d66b3deca1a23130bcccb34be466d790c63b`	ooxml-ole-object	OOXML embedded OLE part: xl/embeddings/Qbdky47u.4zzs	879104 bytes
`ooxml_oleobject_00_ole10native_00.bin` `fb52efd5a20f134cfa4e2f314704012b3a599e915829f53df661f1ff03c697a0`	ole-package	OOXML xl/embeddings/Qbdky47u.4zzs Ole10Native stream: olE10NaTive	869760 bytes

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