Office (OOXML) / .XLSX malware analysis — malicious · 62bcc78974daafee

MALICIOUS

Office (OOXML) / .XLSX

3.72 MB Created: 2006-09-16 00:00:00 UTC Authoring application: Microsoft Excel 14.0300 First seen: 2022-08-23

MD5: 603520324ae114e020f75c3993d70247 SHA-1: 46615360bfa7139ad31786ad569e808137db3309 SHA-256: 62bcc78974daafee7a8ce8f93918f8de8705c29a85aad396dfe5af4bb9fa0e86

142 Risk Score

Malware Insights

MITRE ATT&CK

T1566.002 Spearphishing Attachment T1204.002 Malicious File

The sample is an Excel file containing an embedded OLE object, specifically identified as a vulnerable Equation Editor object. Heuristics indicate anomalies consistent with CVE-2018-0798, suggesting the Equation Editor is used to exploit a vulnerability and deliver a payload. The embedded OLE object and its native stream exhibit high entropy and anomalous headers, strongly indicating malicious intent.

Heuristics 5

Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR

Embedded OLE object xl/embeddings/KdSjurF.CWwPy 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` `3d12cfc068bf7d0a82236d343ab2016aeaf527c1aaad578089860131c4729b47`	ooxml-ole-object	OOXML embedded OLE part: xl/embeddings/KdSjurF.CWwPy	4188160 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` `eb3e8057b215ffb5d9ea315da2f23597ebdf09dd3fd853ff6891aae79fb671fd`	ole-package	OOXML xl/embeddings/KdSjurF.CWwPy Ole10Native stream: OLE10natiVE	4152956 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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