Office (OOXML) / .XLSX malware analysis — malicious · a987ed00818ba134

MALICIOUS

Office (OOXML) / .XLSX

694.1 KB Created: 2019-11-27 09:20:57 UTC Authoring application: Microsoft Excel 12.0000

MD5: b4b13a1716d73d42e5da25328eb02a69 SHA-1: 384eae0aacadd9c6995122a9ad21a1e3a478496e SHA-256: a987ed00818ba134d610fe45ef974f0c27c5d3988ea12f3ad40f1ab462a500cc

100 Risk Score

Malware Insights

MITRE ATT&CK

T1566.002 Spearphishing Attachment T1204.002 Malicious File

The sample is an Office Open XML (OOXML) file containing an embedded OLE object, specifically identified as a Microsoft Equation Editor object. High-severity heuristics indicate that this Equation Editor object carries a payload-like Ole10Native stream with an anomalous header, strongly suggesting exploitation of a known vulnerability (e.g., CVE-2017-11882) to execute arbitrary code. No specific IOCs like URLs or hashes were extracted, but the attack pattern is clear.

Heuristics 3

Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR

Embedded OLE object xl/embeddings/9yT.gx 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

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`ooxml_oleobject_00.bin` `abf1396ca5926857accfb3c94170a9822f400259740d2a0b3f546d814845ca54`	ooxml-ole-object	OOXML embedded OLE part: xl/embeddings/9yT.gx	960000 bytes
`ooxml_oleobject_00_ole10native_00.bin` `808a628561b1681184dd6920768ad7d966f9b33d182ed54aedf74669040d0a14`	ole-package	OOXML xl/embeddings/9yT.gx Ole10Native stream: oLe10NAtIve	950251 bytes

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