Office (OOXML) / .XLSX malware analysis — malicious · 7ed0586b68a24bbe

MALICIOUS

Office (OOXML) / .XLSX

1.33 MB Created: 2022-11-21 03:38:49 UTC Authoring application: Microsoft Excel 12.0000 First seen: 2023-05-23

MD5: ffedfe7523a3c30d1cf3706c01d08866 SHA-1: 1710ad19a359f5b01ced32cd1668a5243bedcb4c SHA-256: 7ed0586b68a24bbe7cb29852beb48f2c6a625af46d2fbc3c652d552aa1b1bb5b

142 Risk Score

Malware Insights

MITRE ATT&CK

T1566.002 Spearphishing Attachment T1204.002 Malicious File

The file is an Excel spreadsheet containing an embedded OLE object, specifically an Equation Editor object. Heuristics indicate that this Equation Editor object is anomalous and carries a payload, strongly suggesting exploitation of CVE-2018-0798. This technique is commonly used to deliver second-stage malware.

Heuristics 5

Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR

Embedded OLE object xl/embeddings/b1LFs.LjIer 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` `d8537c23877d53ae6e59973e3edde2ddac0748143c0e240a1151397f680ee7a2`	ooxml-ole-object	OOXML embedded OLE part: xl/embeddings/b1LFs.LjIer	1673216 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact entropy is 7.99, consistent with packed or encrypted content.
`ooxml_oleobject_00_ole10native_00.bin` `2cf73deeacbee6447d12d486692558c3ede67b5db2f22ca93080438415173b86`	ole-package	OOXML xl/embeddings/b1LFs.LjIer Ole10Native stream: OLE10naTiVE	1657532 bytes
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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