Office (OOXML) / .XLSX malware analysis — malicious · cddc95dc2c898026

MALICIOUS

Office (OOXML) / .XLSX

2.26 MB Created: 2022-07-26 22:32:06 UTC Authoring application: Microsoft Excel 12.0000 First seen: 2022-08-05

MD5: a94914521d02380feeb6d2d6dbc202e1 SHA-1: c0fe8bb34b1ee734ff2a556cf55927d6b6a34acf SHA-256: cddc95dc2c898026ccdcdf1694180c812435f8155cb71620ea034629c24dae52

102 Risk Score

Malware Insights

MITRE ATT&CK

T1559 Component Object Model Hijacking T1559.001 Component Object Model Hijacking: Component Object Model Hijacking

The sample is an Excel file containing an embedded OLE object, specifically identified as an Equation Editor. Heuristics indicate that this Equation Editor object carries a payload within its Ole10Native stream, with an unusually large declared size and high entropy. This strongly suggests the object is intended to exploit a vulnerability or deliver a secondary stage payload.

Heuristics 4

Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR

Embedded OLE object xl/embeddings/L6sG9oV.P41 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 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` `a7ee365898187314d396dac5078427ace09863adf5e938dad9097e22f1e93a37`	ooxml-ole-object	OOXML embedded OLE part: xl/embeddings/L6sG9oV.P41	2689024 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact entropy is 7.97, consistent with packed or encrypted content.
`ooxml_oleobject_00_ole10native_00.bin` `df451d13b69d0f33873acb58444a385d238b81fbd0dbbb44503552cc3237d2b5`	ole-package	OOXML xl/embeddings/L6sG9oV.P41 Ole10Native stream: oLE10NAtivE	2665125 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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