Office (OOXML) malware analysis — malicious · 9a19a1518754c68b

MALICIOUS

Office (OOXML)

682.7 KB Created: 2006-01-10 09:37:37 UTC Authoring application: Microsoft Excel 15.0300 First seen: 2021-06-28

MD5: 8dc2e6594ba65ed4963bcd8a722ca93e SHA-1: 36496d50fb0344f8926833cb80bac157a49144d6 SHA-256: 9a19a1518754c68bd0d80c1d5559c3d829995b44a0fb689ccb6e807ffb937aeb

120 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The file is an OOXML document containing an embedded OLE object, identified as an Equation Editor. This object exhibits anomalies in its Ole10Native stream, indicating it likely carries a malicious payload. The presence of shellcode candidate regions further supports this, suggesting exploitation for client execution. The document body appears to be a benign PF report, likely used as a lure.

Heuristics 4

Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR

Embedded OLE object xl/embeddings/kiPuR.dYrd contains the Equation Editor CLSID, the legacy component exploited by CVE-2017-11882, CVE-2018-0802, and CVE-2018-0798.
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 medium 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`	ooxml-ole-object	OOXML embedded OLE part: xl/embeddings/kiPuR.dYrd	982016 bytes
SHA-256: `542d4ada54811af2c0e811ffb06343ccd21e52ae8d6b092184c76d8eedbd1fcb`
Detection ClamAV: No threats found Obfuscation or payload: likely Static shellcode analysis found candidate code region(s). Indicators: SC_GETPC_CALL
`ooxml_oleobject_00_ole10native_00.bin`	ole-package	OOXML xl/embeddings/kiPuR.dYrd Ole10Native stream: oLE10nAtive	972167 bytes
SHA-256: `ecf04b6993e49d5f155f84d38507d7107b8c8d18cbe0b47f3334a8a8a015f97b`
Detection ClamAV: No threats found Obfuscation or payload: likely Static shellcode analysis found candidate code region(s). Indicators: SC_GETPC_CALL

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