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

Static analysis result for SHA-256 37f9cf259fbf18c0…

MALICIOUS

Office (OOXML) / .XLSX

678.8 KB Created: 2023-08-03 11:34:29 UTC Authoring application: Microsoft Excel 16.0300 First seen: 2023-10-11
MD5: 16092864bb21b9adc5eb59c9b7a7bc9b SHA-1: 52929b716e7b2d651077f4170500c27fe97bc31e SHA-256: 37f9cf259fbf18c03976d6639e6ff6411e926bbff354673eb23f264cb2f71934
100 Risk Score

Malware Insights

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

The file contains an embedded OLE object, specifically identified as a Equation Editor object with an anomalous Ole10Native stream. This structure strongly suggests the exploitation of a known vulnerability within the Equation Editor component to execute a malicious payload. The anomaly in the Ole10Native stream size indicates it likely contains a secondary stage payload. The embedded OLE object and its anomalous stream are the primary indicators of this attack vector.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/kME9mwnt.IJmePT 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
566bec68af5939314e54fdd67556cbeb269476dcbed1bf315743cfc22ad44ac4		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/kME9mwnt.IJmePT 940544 bytes
ooxml_oleobject_00_ole10native_00.bin
afb7f96b47c8a8527cac2d1e710196f47b8a33c17a80c79e21f673f887697bca		 ole-package OOXML xl/embeddings/kME9mwnt.IJmePT Ole10Native stream: oLe10NATivE 930683 bytes

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