Office (OOXML) / .XLSX malware analysis — malicious · 89ab9c520fd289e7

MALICIOUS

Office (OOXML) / .XLSX

1.41 MB Created: 2021-09-22 12:07:42 UTC Authoring application: Microsoft Excel 12.0000 First seen: 2022-03-12

MD5: 1dd97c2f01d3c8f2cc2a43a4d7936d2a SHA-1: 24cdd37c007d243e5ece743ceeff76a05754b838 SHA-256: 89ab9c520fd289e7ab8442e5b3ea8f417faa0561bf0104180eda29bd2a762ba7

142 Risk Score

Malware Insights

MITRE ATT&CK

T1566.002 Spearphishing Attachment T1204.002 Malicious File

The sample is an OOXML file containing an embedded OLE object, specifically identified as a Microsoft Equation Editor object. Heuristics indicate anomalies within the Equation Editor's native stream, strongly suggesting exploitation of CVE-2018-0798. This vulnerability is known to be used for delivering malicious payloads, likely through the embedded object.

Heuristics 5

Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR

Embedded OLE object xl/embeddings/FcabAL.QX2 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` `108fb4d9c26cfcec04ecb032e39ab5713c78caaa5ffa3a7d249f9f1a0fa1e49e`	ooxml-ole-object	OOXML embedded OLE part: xl/embeddings/FcabAL.QX2	1742848 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` `32e610c94d59042211517b5d2a4eba6e74ae21fa4b956d0d1be09a301ae29cfb`	ole-package	OOXML xl/embeddings/FcabAL.QX2 Ole10Native stream: Ole10Native	1726664 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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