Malicious Office (OOXML) / .XLSX — malware analysis report

Static analysis result for SHA-256 897465e9560c4f3e…

MALICIOUS

Office (OOXML) / .XLSX

722.9 KB Created: 2023-07-26 19:45:53 UTC Authoring application: Microsoft Excel 12.0000 First seen: 2023-08-09
MD5: 2af93ff580d5d57508098fb1e073a160 SHA-1: ecc8b2e7b3112bddadc279328a760cd3d6285392 SHA-256: 897465e9560c4f3e1dc0dc36d0eaf0931631fedabc46270e56e723ec4c1da3f6
100 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious File

The file is an OOXML document containing an embedded OLE object, specifically identified as a Microsoft Equation Editor object. Heuristics indicate that this Equation Editor object carries a payload-like Ole10Native stream, suggesting it's designed to exploit a vulnerability. This is a common technique for delivering malicious payloads via weaponized Office documents.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/ae.LKq 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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
ooxml_oleobject_00.bin
4cb1aa4a10318e64c97a855547d59bc2f3e7daa296cfe172221b6e4456be7016		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/ae.LKq 1068544 bytes
ooxml_oleobject_00_ole10native_00.bin
5bbaf06448ffcf953a83f8cc91ff52b5989eda493e748035eec90dfe44676a42		 ole-package OOXML xl/embeddings/ae.LKq Ole10Native stream: Ole10naTive 1057288 bytes

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