Office (OOXML) / .XLSX malware analysis — malicious · ad5b6ca2d4a912e7

MALICIOUS

Office (OOXML) / .XLSX

2.00 MB Created: 2022-08-10 18:51:50 UTC Authoring application: Microsoft Excel 16.0300 First seen: 2023-09-15

MD5: 3cefd37e2b0a27c6662da267640a7185 SHA-1: 5cf76b33a48e337d26050145e4a3b7bba27a1448 SHA-256: ad5b6ca2d4a912e736f5fda3fe0919a5eafc164f95804cdc2d44bf00013364ab

100 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious File

The file contains an embedded OLE object, specifically identified as a Microsoft Equation Editor object with an anomalous Ole10Native stream. This indicates the object is likely a carrier for a malicious payload, exploiting a known vulnerability in the Equation Editor. The document body, formatted as a purchase order, serves as a lure to trick users into opening the malicious content.

Heuristics 3

Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR

Embedded OLE object xl/embeddings/detBS.BTPhAl 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` `12fc05de4264f679ea99ed5778cef14fca0083fd24999d508bec140c4fca7451`	ooxml-ole-object	OOXML embedded OLE part: xl/embeddings/detBS.BTPhAl	2846208 bytes
`ooxml_oleobject_00_ole10native_00.bin` `1d4c325cac9a55df56c5ac27af6f5ccb283dbe960d78dbe05ef4885353ad94a8`	ole-package	OOXML xl/embeddings/detBS.BTPhAl Ole10Native stream: OlE10NaTIvE	2821450 bytes

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