Office (OOXML) / .XLSX malware analysis — malicious · 7fcf5bd177dfbe71

MALICIOUS

Office (OOXML) / .XLSX

621.1 KB Created: 2022-08-10 18:51:50 UTC Authoring application: Microsoft Excel 16.0300 First seen: 2024-08-06

MD5: da02ceaf2e4aaba80a9f08286a677f50 SHA-1: 16bbd210960e960717df9a2b80369ec1ef14d930 SHA-256: 7fcf5bd177dfbe71c9c24feed616420b1bf1bd9f65fb1f8fbd2ee47920cc67a2

100 Risk Score

Malware Insights

MITRE ATT&CK

T1204 Malicious File T1204.002 Malicious File: User Execution T1559 Component Object Model Hijacking T1559.001 Component Object Model Hijacking: COM Hijacking

The sample contains 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 and a significantly larger declared inner size than the actual stream size. This strongly suggests the exploitation of a vulnerability within the Equation Editor component to execute arbitrary code. The document body content appears to be a fabricated purchase order, likely serving as a lure.

Heuristics 3

Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR

Embedded OLE object xl/embeddings/iga341e.cLz 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` `da32156b5784f4c71506aeb22b52d35c88d63e37eb8660a8036b876566dbe8d7`	ooxml-ole-object	OOXML embedded OLE part: xl/embeddings/iga341e.cLz	862720 bytes
`ooxml_oleobject_00_ole10native_00.bin` `15528de89edb27cf59c5f5bac5b1c894b0543986f4cb42cefa2097b045c4ddba`	ole-package	OOXML xl/embeddings/iga341e.cLz Ole10Native stream: OLE10naTIve	853358 bytes

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