Office (OOXML) malware analysis — malicious · f5b694bbd4cefa63

MALICIOUS

Office (OOXML)

721.6 KB Created: 2012-07-25 13:58:16 UTC Authoring application: Microsoft Excel 14.0300

MD5: ac2cfc889a8c56faea5c0f998349c22a SHA-1: 5fb0d5e280ec4bd24d38b6d901e527e66c5a3fb3 SHA-256: f5b694bbd4cefa63a9be7ca8102aa866b5a1dc735144be39575fab7eb7b73d2c

142 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The file is an OOXML document containing an embedded OLE object, specifically identified as a Microsoft Equation Editor object. Heuristics indicate this object is anomalous and carries a payload, strongly suggesting exploitation of CVE-2018-0798 or a similar vulnerability. The embedded OLE object is the primary indicator of malicious intent, likely used to execute a secondary payload upon opening.

Heuristics 5

Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR

Embedded OLE object xl/embeddings/oleObject1.bin 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` `8a288a1feea6bae97cd7abfac30e1da26bd1196fdbda7ffab00b3aa18f345ed2`	ooxml-ole-object	OOXML embedded OLE part: xl/embeddings/oleObject1.bin	437248 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact entropy is 8.00, consistent with packed or encrypted content.
`ooxml_oleobject_00_ole10native_00.bin` `3971ad28d6c85d41bd16f9a5c306189e639180678700c89be1042c14da5060eb`	ole-package	OOXML xl/embeddings/oleObject1.bin Ole10Native stream: Ole10naTIve	431352 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact entropy is 8.00, consistent with packed or encrypted content.

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