Office (OOXML) / .XLSX malware analysis — malicious · 1c29e118bb031439

MALICIOUS

Office (OOXML) / .XLSX

587.7 KB Created: 2023-11-17 18:26:59 UTC Authoring application: Microsoft Excel 12.0000 First seen: 2024-08-15

MD5: 81288b157f57a1d41ae95ca3c81a2114 SHA-1: 97631816b04a2f94fd881401b7431fa3452280f7 SHA-256: 1c29e118bb0314391a924866dce2fdf09d1b9a88bbe3e0acb4193579b8402dfd

100 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious File

The file is an Excel spreadsheet containing a malicious OLE object, identified as an Equation Editor exploit. The OLE object's Ole10Native stream has an anomalous header and a significantly larger declared size than its actual stream size, indicating it likely contains a packed or obfuscated payload. The document body contains financial calculation data, suggesting a lure related to financial matters, potentially to trick users into enabling macros or interacting with the malicious object.

Heuristics 3

Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR

Embedded OLE object xl/embeddings/qAi.Mlp 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` `2215c1a2925939ed55a83c9cfb344a2301a6efa90f23279f7c6302a2e7b6f5f8`	ooxml-ole-object	OOXML embedded OLE part: xl/embeddings/qAi.Mlp	801280 bytes
`ooxml_oleobject_00_ole10native_00.bin` `dccc6873750ae077698eb843aadedba9ebc5e9efa72a3f570230b0559a24a9ba`	ole-package	OOXML xl/embeddings/qAi.Mlp Ole10Native stream: oLe10naTIve	792150 bytes

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