Office (OOXML) malware analysis — malicious · 48637471e9647a6e

MALICIOUS

Office (OOXML)

802.5 KB Created: 2021-02-03 07:57:22 UTC Authoring application: Microsoft Excel 15.0300 First seen: 2021-06-28

MD5: 886b2e4359eac64821f1b5a58c8912bb SHA-1: fe25e5b7a59f70d97b0511895b6b638291500731 SHA-256: 48637471e9647a6e3ca69a73a6afea4e300c4ed31c6bf45c031c1ff4a9d53793

160 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution

The file is an Excel document containing an embedded OLE object, specifically an Equation Editor object. High-severity heuristics indicate that this object is anomalous and likely contains a payload, exploiting CVE-2018-0798. The embedded object's native stream is suspicious and suggests arbitrary code execution capabilities.

Heuristics 5

Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR

Embedded OLE object xl/embeddings/X63MSn.u791gN 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 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/X63MSn.u791gN	1050112 bytes
SHA-256: `2da1c330b0e8aaad02bf2541a0baaa355b445c5c9740fb6a887df5a818b3aa85`
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/X63MSn.u791gN Ole10Native stream: Ole10nAtivE	1039349 bytes
SHA-256: `7af679cc2cad2a55bc5577bcb6c5d45ea4d6eeea8bc5c3cc47fc031d1c67ff2b`
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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