Office (OOXML) malware analysis — malicious · c01c9ed992a9a53e

MALICIOUS

Office (OOXML)

741.4 KB Created: 2021-06-15 16:15:04 UTC Authoring application: Microsoft Excel 12.0000 First seen: 2021-06-28

MD5: 603977ef9a11545ab245191c78dff135 SHA-1: aa3a75ad36615911d260d314523ddb1f93903b3a SHA-256: c01c9ed992a9a53eff555faea4d47e061e2bf819424beafad48b280cce000d9c

120 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The sample is an Office document containing an embedded OLE object, specifically identified as a Microsoft Equation Editor object. Heuristics indicate this object carries a payload-like Ole10Native stream with an anomalous header and a large declared inner size, strongly suggesting exploitation of a vulnerability like CVE-2017-11882. This technique is commonly used to execute arbitrary code, likely a second-stage payload.

Heuristics 4

Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR

Embedded OLE object xl/embeddings/CxKh.NM 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/CxKh.NM	1078272 bytes
SHA-256: `fd3d4c37c658ee842d35f5a8f16d427152a45fb7d967a23086d07f583c41ff8b`
Detection ClamAV: No threats found Obfuscation or payload: likely Static shellcode analysis found candidate code region(s). Indicators: SC_GETPC_CALL
`ooxml_oleobject_00_ole10native_00.bin`	ole-package	OOXML xl/embeddings/CxKh.NM Ole10Native stream: ole10naTive	1067082 bytes
SHA-256: `69805d92410c985438d8247a1053cc0852786046df5d7f99ac3165d366a57f41`
Detection ClamAV: No threats found Obfuscation or payload: likely Static shellcode analysis found candidate code region(s). Indicators: SC_GETPC_CALL

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