Office (OOXML) malware analysis — malicious · 8a2aefd86a8e3489

MALICIOUS

Office (OOXML)

1.36 MB Created: 2021-02-03 07:57:22 UTC Authoring application: Microsoft Excel 15.0300 First seen: 2021-06-17

MD5: 253d6a3d0d6a2961703fc71e695a851a SHA-1: 05b002fc9e4794d4d00c5566db630d471037dc38 SHA-256: 8a2aefd86a8e348981c6a6645266cb8cc89001fa8fe28222f3300df3d15aa9f2

120 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution

The sample is an OOXML file containing an embedded OLE object, specifically identified as a Microsoft Equation Editor object. Heuristics indicate that this object carries a payload-like Ole10Native stream with high entropy, strongly suggesting it is shellcode designed to exploit a vulnerability. This points to exploitation for client execution via the Equation Editor vulnerability.

Heuristics 4

Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR

Embedded OLE object xl/embeddings/HEAsQ9.2u5op 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 medium 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`	ooxml-ole-object	OOXML embedded OLE part: xl/embeddings/HEAsQ9.2u5op	1681408 bytes
SHA-256: `6afb476a5ca1f526b2028b695bd7a5b06ccafc54a550b583384c5d9fba0b09fa`
Detection ClamAV: No threats found Obfuscation or payload: likely Static shellcode analysis found candidate code region(s). Indicators: SC_GETPC_CALL Carved artifact entropy is 7.99, consistent with packed or encrypted content.
`ooxml_oleobject_00_ole10native_00.bin`	ole-package	OOXML xl/embeddings/HEAsQ9.2u5op Ole10Native stream: OLE10naTIVe	1665999 bytes
SHA-256: `e77c9cdd0c671a45d00dafceee463da7b9ca8e0f8f687c05f57a82029c9cc576`
Detection ClamAV: No threats found Obfuscation or payload: likely Static shellcode analysis found candidate code region(s). Indicators: SC_GETPC_CALL Carved artifact entropy is 7.99, consistent with packed or encrypted content.

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