Office (OOXML) / .XLSX malware analysis — malicious · 156267182f1b3274

MALICIOUS

Office (OOXML) / .XLSX

1.20 MB Created: 2019-10-24 08:51:40 UTC Authoring application: Microsoft Excel 12.0000 First seen: 2022-04-08

MD5: 18833889badcbed5ff711054d01f50be SHA-1: bf2007ce83b9cd5649fbb2b0abf651b2f4aaaac9 SHA-256: 156267182f1b32745d4a5f3aaf1cc9a10463f35b7507b60973197275d6852ba9

142 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The sample is an Excel file containing an embedded OLE object, specifically identified as a Microsoft Equation Editor object. Heuristics indicate anomalies within the Equation Editor's native stream, strongly suggesting exploitation of CVE-2018-0798. This vulnerability allows for the execution of arbitrary code, likely to download and run a secondary payload.

Heuristics 5

Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR

Embedded OLE object xl/embeddings/aYp5zUp.hItckY2 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` `0ed51e08c015a64c52e26d2227e1e66393ef83a23d25f277ed5c9050bf091ead`	ooxml-ole-object	OOXML embedded OLE part: xl/embeddings/aYp5zUp.hItckY2	1494016 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact entropy is 7.99, consistent with packed or encrypted content.
`ooxml_oleobject_00_ole10native_00.bin` `2e8bb0988aa763ee0f0f42cfd20fad4b0ed9b4da5976b8aaacf31501109f7d44`	ole-package	OOXML xl/embeddings/aYp5zUp.hItckY2 Ole10Native stream: Ole10naTIVE	1480085 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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