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

Static analysis result for SHA-256 973c4e8724075fc2…

MALICIOUS

Office (OOXML) / .XLSX

640.0 KB Created: 2023-07-26 19:45:53 UTC Authoring application: Microsoft Excel 12.0000 First seen: 2023-10-22
MD5: 8056f83586f30385d8f6be0722cc24ba SHA-1: 77a3cd8f6d100c47ec60ddfd1748ed0785fa9a6d SHA-256: 973c4e8724075fc2789f8aaf717ed09a69ede94f0bda1eae5ec70978134c9e78
100 Risk Score

Malware Insights

MITRE ATT&CK
T1559.001 Component Object Model Hijacking

The sample is an Excel file containing an embedded OLE object, specifically an Equation Editor. High-severity heuristics indicate that this Equation Editor object contains an Ole10Native stream with an anomalous size and entropy, strongly suggesting it carries a malicious payload. The embedded object's path and the stream name are identified as IOCs.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/Gxm0vMfPq.QuFrM 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
7d1b99bfa92e99de9dd24a37ef121a9249a1efb5934d9124bf8c508ad5f8a458		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/Gxm0vMfPq.QuFrM 876544 bytes
ooxml_oleobject_00_ole10native_00.bin
0d2993742467e45dc11d62118364a010385a28c72b306b71b5d57974152302e5		 ole-package OOXML xl/embeddings/Gxm0vMfPq.QuFrM Ole10Native stream: ole10NaTivE 867148 bytes

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