Office (OOXML) / .XLSX malware analysis — malicious · 107f969203c31c15

MALICIOUS

Office (OOXML) / .XLSX

1.83 MB Created: 2021-09-22 12:07:42 UTC Authoring application: Microsoft Excel 12.0000 First seen: 2022-05-19

MD5: a37f2653b4e7df1a9fadd0e909d2c5dd SHA-1: 1485d0afdbbe7588c31d44af3ad8bf2fad2284bd SHA-256: 107f969203c31c1593fb3eb175f85e64f6976b17f2a3cacfac5bbd7782bd8dcd

142 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution

The file is an Excel spreadsheet containing an embedded OLE object, specifically an Equation Editor object. Heuristics indicate this object is anomalous and likely contains a payload, exploiting CVE-2018-0798. This technique allows for the execution of arbitrary code on the victim's machine.

Heuristics 5

Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR

Embedded OLE object xl/embeddings/0c.suXAkn 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` `2f6ac9f5591a43fd8b4d94d2e530101ff1937e444eb0ed596e1df60e329dd3bf`	ooxml-ole-object	OOXML embedded OLE part: xl/embeddings/0c.suXAkn	2190848 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` `267ff3ce6404e45953372dabc9c91a827d8f0909a7adacb8857e23f135b14ef9`	ole-package	OOXML xl/embeddings/0c.suXAkn Ole10Native stream: ole10NatiVe	2171178 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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