Office (OOXML) / .XLSX malware analysis — malicious · 286d4661323a7e9f

MALICIOUS

Office (OOXML) / .XLSX

614.7 KB Created: 2010-06-04 08:55:28 UTC Authoring application: Microsoft Excel 15.0300 First seen: 2023-10-12

MD5: ba7d1a03912391634ae90054a6b7c998 SHA-1: 31cdca56a8f8b5c260e9a483dd85d76ff5278e9d SHA-256: 286d4661323a7e9ff829e61d0574a4d62901afcc24ee9400b8c1ef9bafb6e3d1

100 Risk Score

Malware Insights

MITRE ATT&CK

T1559.001 Component Object Model Hijacking T1204.002 Malicious File

The file is an Office 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 header, suggesting it's being used to exploit a vulnerability. The document body appears to be an invoice, likely a lure to entice the user to open the malicious content.

Heuristics 3

Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR

Embedded OLE object xl/embeddings/zLsPcz.pAA 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` `3a6f0e8ff86d5698b177411ac914d603b8d92a0e86cea7871da73eab8bc98a65`	ooxml-ole-object	OOXML embedded OLE part: xl/embeddings/zLsPcz.pAA	815616 bytes
`ooxml_oleobject_00_ole10native_00.bin` `1f486480db45c4bb6c1a2f4f2c52d20deb186d9ca42355878cc27299bcf8ae00`	ole-package	OOXML xl/embeddings/zLsPcz.pAA Ole10Native stream: oLE10NAtive	806798 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.