Office (OOXML) / .XLSX malware analysis — malicious · 538a167c37909dc5

MALICIOUS

Office (OOXML) / .XLSX

1.18 MB Created: 2022-11-18 02:05:27 UTC Authoring application: Microsoft Excel 12.0000 First seen: 2023-07-12

MD5: 4356cc62f7cafef499e0d81ec1bcb928 SHA-1: 7ebdb884587396fc5b1272710a18ead392464976 SHA-256: 538a167c37909dc569d16255a918625acd316d94e969ed2095214a85f9844ad2

102 Risk Score

Malware Insights

MITRE ATT&CK

T1559.001 Component Object Model Hijacking T1204.001 Malicious Link

The file contains an embedded OLE object, specifically identified as a Microsoft Equation Editor object. This object carries a payload within its Ole10Native stream, indicated by an anomalous header and high entropy, suggesting it's designed to execute malicious code. The presence of this exploit points towards a delivery mechanism leveraging a known Equation Editor vulnerability.

Heuristics 4

Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR

Embedded OLE object xl/embeddings/0j5.cs2V 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` `724c07a06b3ade729795be184a205528c36d1c96927771029eb6c681d1e30d7c`	ooxml-ole-object	OOXML embedded OLE part: xl/embeddings/0j5.cs2V	1490432 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` `85d8bd43935fc9a9d7390798ea906b487aa2daf6b2875fd21762c50d45b5c5c9`	ole-package	OOXML xl/embeddings/0j5.cs2V Ole10Native stream: OlE10native	1476511 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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