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

Static analysis result for SHA-256 77e72116bae3789e…

MALICIOUS

Office (OOXML) / .XLSX

712.5 KB Created: 2023-08-03 11:34:29 UTC Authoring application: Microsoft Excel 16.0300 First seen: 2023-10-18
MD5: df34855d0d0f2ea1a84b220541d3b4e0 SHA-1: 82f0be69ade282cde6ad8bc17eddc894b4f67a64 SHA-256: 77e72116bae3789e455e2bc8cf088f1c358243251d19cead84ec70aa691e8b07
100 Risk Score

Malware Insights

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

The file is an Excel document 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 vulnerability within the Equation Editor component. 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/PzfcCk9.QBt0I 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
e7df400290648b1d1b7e665b07b3a8b7df5ff8fd3ee3598eba02073617c37405		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/PzfcCk9.QBt0I 966656 bytes
ooxml_oleobject_00_ole10native_00.bin
57e49966f2859d7f388b4c7133d76b846d171268aee4c186a6d31f17fcf30a4c		 ole-package OOXML xl/embeddings/PzfcCk9.QBt0I Ole10Native stream: olE10natIve 956832 bytes

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