Office (OOXML) / .XLSX malware analysis — malicious · dc61bd75488032a4

MALICIOUS

Office (OOXML) / .XLSX

1.16 MB Created: 2021-09-22 12:07:42 UTC Authoring application: Microsoft Excel 12.0000 First seen: 2022-04-12

MD5: 2308d9b0f499388c91d9e4dca8f17edf SHA-1: 56c02f80b1ff89a8743631a68b9a84184897f297 SHA-256: dc61bd75488032a4e6698d3d73dfe9b0cdb8dc64526a60d2a6cd317096a1e05f

142 Risk Score

Malware Insights

MITRE ATT&CK

T1204 Malicious Link T1204.001 Malicious Link: Malicious Link 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 a Microsoft Equation Editor object. Heuristics indicate this object is anomalous and carries a payload, strongly suggesting exploitation of CVE-2018-0798. This vulnerability allows for the execution of arbitrary code, likely to download and execute a second-stage payload. The embedded artifact path 'xl/embeddings/USMFwD2a1.gmHs' is noted as a potential indicator.

Heuristics 5

Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR

Embedded OLE object xl/embeddings/USMFwD2a1.gmHs 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` `0f88c32c70ac3db7c1f7d6ac2848291f497564703127765138150c48a0a952ad`	ooxml-ole-object	OOXML embedded OLE part: xl/embeddings/USMFwD2a1.gmHs	1546752 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact entropy is 7.89, consistent with packed or encrypted content.
`ooxml_oleobject_00_ole10native_00.bin` `a69699a85a9188dde4417d74e0972ec3b4bf7d7e5beed513a65af2783f132c84`	ole-package	OOXML xl/embeddings/USMFwD2a1.gmHs Ole10Native stream: Ole10Native	1532266 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact entropy is 7.79, consistent with packed or encrypted content.

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