Office (OOXML) / .XLSX malware analysis — malicious · a6d67eac3f8ec8b8

MALICIOUS

Office (OOXML) / .XLSX

1.00 MB Created: 2021-09-22 12:07:42 UTC Authoring application: Microsoft Excel 12.0000 First seen: 2022-04-05

MD5: 0181ddead2fc2a2a1eba3819d7f6237a SHA-1: c3a9d18efdd830df2a9397834c5c51b9f804ade4 SHA-256: a6d67eac3f8ec8b8b72469dc712fa468da42451215ac27bd81e394e55aab4e15

142 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1559.001 Component Object Model and Distributed Component Object Model

The sample is an Excel file containing an embedded OLE object, specifically identified as a Microsoft Equation Editor object. Heuristics indicate this object is anomalous and carries a payload, strongly suggesting exploitation of CVE-2018-0798. The embedded OLE object and its anomalous native stream are the primary indicators of malicious activity, likely leading to the execution of a secondary payload.

Heuristics 5

Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR

Embedded OLE object xl/embeddings/qVNDT.iwN9Dn 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` `853a780f42a11db332a7104892de64eb1f669299bcf78e71ecf3761b49723f95`	ooxml-ole-object	OOXML embedded OLE part: xl/embeddings/qVNDT.iwN9Dn	1332736 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact entropy is 7.52, consistent with packed or encrypted content.
`ooxml_oleobject_00_ole10native_00.bin` `85057a5f851332983444bd17b9243808611b7bab1c18c6855b7f63e3bfb2a34f`	ole-package	OOXML xl/embeddings/qVNDT.iwN9Dn Ole10Native stream: Ole10Native	1319577 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact entropy is 7.51, consistent with packed or encrypted content.

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