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

Static analysis result for SHA-256 093c05dc55d28daf…

MALICIOUS

Office (OOXML) / .XLSX

642.4 KB Created: 2023-08-03 11:34:29 UTC Authoring application: Microsoft Excel 16.0300 First seen: 2023-10-11
MD5: 294b7f3f1dc719d4d06a8723b5fb0846 SHA-1: f2c3085a1bdf872e54795eec252c923a9534ebf2 SHA-256: 093c05dc55d28daff34e1990684ead4cd4b1e2fc10e59142fcfd30721c9d0ebe
100 Risk Score

Malware Insights

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

The XLSX file contains an embedded OLE object, specifically identified as a Microsoft Equation Editor object. High-severity heuristics indicate that this Equation Editor object carries a payload-like Ole10Native stream with an anomalous size and entropy, strongly suggesting it's used to exploit a vulnerability. This is a common delivery mechanism for malware.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/cxGAsXct.oV 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
c83235cbe6c527e6049e7b5cae0a8330c4cc6c22f2c8898a9414b9bdffcffb13		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/cxGAsXct.oV 937984 bytes
ooxml_oleobject_00_ole10native_00.bin
86d9289cd12d14ffdf238cb32c9f996dc6be9ef82f9e027f3371121253c6b022		 ole-package OOXML xl/embeddings/cxGAsXct.oV Ole10Native stream: OLE10NativE 928127 bytes

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