Office (OOXML) / .XLSX malware analysis — malicious · e513edaab913ceff

MALICIOUS

Office (OOXML) / .XLSX

2.27 MB Created: 2021-09-22 12:07:42 UTC Authoring application: Microsoft Excel 12.0000 First seen: 2022-08-18

MD5: 015fb26e44a3e4f9ad7c5d3409f28620 SHA-1: 1f3b9a1a7b7f71dcbe32182d6ca5ff45635ea0a6 SHA-256: e513edaab913ceffbd504ded5c55918290ab571e93aa0a5b46f39ff2b2a59ca2

142 Risk Score

Malware Insights

MITRE ATT&CK

T1566.002 Spearphishing Attachment T1204.002 Malicious File

The sample is an Excel file containing an embedded OLE object, specifically identified as a vulnerable Equation Editor component. Heuristics indicate this component carries a payload and exploits CVE-2018-0798. This suggests the file is designed to leverage this vulnerability to execute a malicious payload upon opening.

Heuristics 5

Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR

Embedded OLE object xl/embeddings/31Mzp8x.0RgoZmt contains the Equation Editor CLSID, the legacy component exploited by CVE-2017-11882, CVE-2018-0802, and CVE-2018-0798.
CVE-2018-0798 — anomalous Equation Editor native stream high CVE likely CVE_2018_0798_EQUATION_NATIVE_ANOMALY

Embedded Equation Editor OLE data contains anomalous native stream bytes consistent with a CVE-2018-0798-style Equation Editor exploit. This is treated as likely CVE evidence because the Equation object is malformed and payload-like, but it does not match the exact public matrix-overflow byte signature.
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
Suspicious extracted artifact info EXTRACTED_FILE_STATIC_TRIAGE

One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`ooxml_oleobject_00.bin` `4673b3cbafe802157185ff26334ff8b6411987c117e1edba698ca64d697d1e2c`	ooxml-ole-object	OOXML embedded OLE part: xl/embeddings/31Mzp8x.0RgoZmt	2637824 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact entropy is 7.97, consistent with packed or encrypted content.
`ooxml_oleobject_00_ole10native_00.bin` `9d7a25b145df10f79ea9d6bdd519484b3c551ad20a94ee7a8f9394947b7f1b2c`	ole-package	OOXML xl/embeddings/31Mzp8x.0RgoZmt Ole10Native stream: Ole10Native	2614632 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact entropy is 7.99, consistent with packed or encrypted content.

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