Office (OOXML) / .XLSX malware analysis — malicious · a2538416e498f55d

MALICIOUS

Office (OOXML) / .XLSX

1.64 MB Created: 2022-09-30 00:41:36 UTC Authoring application: Microsoft Excel 12.0000 First seen: 2022-10-31

MD5: 6a6b4dccf2536d72ff1c242e872b06fa SHA-1: 48191e209c81cab24646299e4b7c25b683d7083a SHA-256: a2538416e498f55de2e596db6b0f417ee78ade573034e363f23e3d19d53d402b

142 Risk Score

Malware Insights

MITRE ATT&CK

T1559.001 Component Object Model Hijacking T1204.002 Malicious File

The file contains an embedded OLE object, specifically an Equation Editor object, which exhibits anomalies indicative of exploitation for CVE-2018-0798. This object carries a payload-like Ole10Native stream, suggesting it's designed to execute a secondary malicious component. The high entropy and anomalous stream structure strongly point to a weaponized document.

Heuristics 5

Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR

Embedded OLE object xl/embeddings/1opoGT0.qvPuzhf 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` `5d05433b3e7d49e83f6f7b301998521a7614e8b09cb7d0db5d80fba18d4bf480`	ooxml-ole-object	OOXML embedded OLE part: xl/embeddings/1opoGT0.qvPuzhf	1998848 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` `db60119852d6a6a845fdc064c5165605411c8a54797e3867ad82f030e03ee811`	ole-package	OOXML xl/embeddings/1opoGT0.qvPuzhf Ole10Native stream: ole10NAtive	1980788 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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