Office (OOXML) / .XLSX malware analysis — malicious · d6f7117712ec9be3

MALICIOUS

Office (OOXML) / .XLSX

1.94 MB Created: 2022-11-18 02:05:27 UTC Authoring application: Microsoft Excel 12.0000 First seen: 2024-05-20

MD5: 9203545c2182c302a36b2f1bcbff5056 SHA-1: 461d447139aca277aaa433df3a1ebcfdeb808834 SHA-256: d6f7117712ec9be334a940e8c2ba544a271a5bd63f182042dcbb159017068f1c

102 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The XLSX file contains an embedded OLE object, specifically identified as a Microsoft Equation Editor object. This object exhibits anomalies indicative of a payload, with a significantly larger declared inner size than the actual stream size and high entropy. This strongly suggests exploitation of a known Equation Editor vulnerability (CVE-2017-11882) to execute arbitrary code, likely leading to the download and execution of a secondary malicious payload.

Heuristics 4

Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR

Embedded OLE object xl/embeddings/XhxBsPtQ.zIv 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
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` `c5281baaf927214221ab220ec02bfcc7106462198a7cded881f9fcfaf00e92ba`	ooxml-ole-object	OOXML embedded OLE part: xl/embeddings/XhxBsPtQ.zIv	2279424 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact entropy is 7.98, consistent with packed or encrypted content.
`ooxml_oleobject_00_ole10native_00.bin` `e2e004e9e251e21863a105903a1180c24d2897b09ba124f4ee62cb3f262cd756`	ole-package	OOXML xl/embeddings/XhxBsPtQ.zIv Ole10Native stream: OLE10NAtIvE	2259181 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact entropy is 7.99, consistent with packed or encrypted content.

Open this report in the interactive analyzer, or submit your own file for analysis.