Office (OOXML) / .XLSX malware analysis — malicious · c4036ae358676bba

MALICIOUS

Office (OOXML) / .XLSX

1.81 MB Created: 2022-11-18 02:05:27 UTC Authoring application: Microsoft Excel 12.0000

MD5: c3955c311b951719d7ab4985314fbab0 SHA-1: f48587590c94133e1f33f10b4da85c5ae151da09 SHA-256: c4036ae358676bba732bcb78f6f2768b7076074dff7eec3a74d745dc065e58a5

102 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1559.001 Component Object Model Hijacking

The XLSX file contains an embedded OLE object, specifically identified as a Microsoft Equation Editor object. Heuristics indicate that this object carries a payload with anomalous characteristics, including high entropy and an impossible inner size, strongly suggesting exploitation of a vulnerability within the Equation Editor. This mechanism is commonly used to execute arbitrary code.

Heuristics 4

Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR

Embedded OLE object xl/embeddings/qxsdETZ4d.p0taNeK 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` `a6a6223e2aeeb01f31dc3eda70c4b7be9fa47edeab8fbf3ecd3c7d70a7c8222a`	ooxml-ole-object	OOXML embedded OLE part: xl/embeddings/qxsdETZ4d.p0taNeK	2133504 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact entropy is 7.98, consistent with packed or encrypted content.
`ooxml_oleobject_00_ole10native_00.bin` `16e7d4cbc8f4448f4ae26f27a55cdbd16338d616cbe2770c10d7297ffeb5864b`	ole-package	OOXML xl/embeddings/qxsdETZ4d.p0taNeK Ole10Native stream: olE10natIVe	2114495 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact entropy is 7.99, consistent with packed or encrypted content.

Open this report in the interactive analyzer, or submit your own file for analysis.