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

Static analysis result for SHA-256 6d4d0e107c3d009a…

MALICIOUS

Office (OOXML) / .XLSX

625.1 KB Created: 2023-07-26 19:45:53 UTC Authoring application: Microsoft Excel 12.0000 First seen: 2023-10-11
MD5: 2c0f8b474c8da6b417eebf6f7635880f SHA-1: 838ce8be1780ae6be1d8178d1932af2e61c4f4a2 SHA-256: 6d4d0e107c3d009afecc9c2ff8ed1f4dc5baa52b2218e1eb27153c8743ea01b7
100 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 Equation Editor object. Heuristics indicate that this Equation Editor object carries a payload-like Ole10Native stream with an anomalous size, strongly suggesting exploitation of a known vulnerability such as CVE-2017-11882. The embedded object is likely designed to execute a secondary malicious payload upon opening.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/UEed.fib 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
69779b866fb0ec054b8845ec29c7034bb558f08ba6105fe532f6605c3f206877		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/UEed.fib 912384 bytes
ooxml_oleobject_00_ole10native_00.bin
15090fdc6234d80442b89118d5e5eee5ac63d09a3be827b903fd69b4c62bb162		 ole-package OOXML xl/embeddings/UEed.fib Ole10Native stream: Ole10NaTiVE 902954 bytes

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