Office (OOXML) malware analysis — malicious · 0017e687b729bd24

MALICIOUS

Office (OOXML)

1.50 MB Created: 2006-09-16 00:00:00 UTC Authoring application: Microsoft Excel 12.0000 First seen: 2021-06-17

MD5: cfc22b0be9436de580f44c78bcd3638f SHA-1: 62b21ad1f5168346c1c13c077f9c17e33903047e SHA-256: 0017e687b729bd24c1e61498d8c9c11ae702e0d6a2ebd6ca9105fe9fb48325bb

102 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The sample is an Excel document containing an embedded OLE object, specifically identified as a Microsoft Equation Editor object. Heuristics indicate this object carries a payload-like stream with an anomalous size, strongly suggesting exploitation of a vulnerability within the Equation Editor. This technique is commonly used to achieve arbitrary code execution on the victim's machine.

Heuristics 4

Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR

Embedded OLE object xl/embeddings/pmd4BFq.QnYt 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`	ooxml-ole-object	OOXML embedded OLE part: xl/embeddings/pmd4BFq.QnYt	1844736 bytes
SHA-256: `b270e5717bf004580842608e3edf288ee9224ddb5addc74be10feac66540a0bc`
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`	ole-package	OOXML xl/embeddings/pmd4BFq.QnYt Ole10Native stream: OLe10NATIvE	1827739 bytes
SHA-256: `83cc1af01aa40584db8befc1cd83d135b2e5567a431a7fe9d10ed94023f1f8fe`
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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