Office (OOXML) / .XLSX malware analysis — malicious · d4800340fbd1803a

MALICIOUS

Office (OOXML) / .XLSX

3.40 MB Created: 2021-01-13 03:25:40 UTC Authoring application: Microsoft Excel 12.0000

MD5: 8f310f476d94685424314ab47316f4fe SHA-1: c6de6c8b72681631a3c1292b6733bd393e94086c SHA-256: d4800340fbd1803a42df8ac5b06b47b8d2cafa64738f02282fe4b32e97fa872b

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 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 allows for the execution of arbitrary code, likely to download and execute a secondary payload, although no specific payload or further execution details were extracted.

Heuristics 5

Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR

Embedded OLE object xl/embeddings/FVN5TLc.GhbUZ 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` `45133501e861f06a4707384a6148419ab50b0715ac6dbf261568c44eac3557ae`	ooxml-ole-object	OOXML embedded OLE part: xl/embeddings/FVN5TLc.GhbUZ	3836928 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact entropy is 7.94, consistent with packed or encrypted content.
`ooxml_oleobject_00_ole10native_00.bin` `0884484eef9b0f3efdbbd7cec8760d152ad257a66941fa1ab8c4b013099fc354`	ole-package	OOXML xl/embeddings/FVN5TLc.GhbUZ Ole10Native stream: OlE10native	3804162 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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