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

Static analysis result for SHA-256 0aec16d25d857848…

MALICIOUS

Office (OOXML) / .XLSX

714.7 KB Created: 2023-09-05 22:37:11 UTC Authoring application: Microsoft Excel 15.0300 First seen: 2023-09-06
MD5: 4a7fd755d8ef76a481770518ff903bd3 SHA-1: 987366c05eac4af633c7e48d49356daa3f205cd1 SHA-256: 0aec16d25d857848aaa07c287ab18076025967f48bfb0ed2e695e2799679e929
100 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution T1559.001 Component Object Model Hijacking

The sample is an Excel file containing an embedded OLE object, specifically identified as a Microsoft Equation Editor object. Heuristics indicate that this Equation Editor object carries a payload-like Ole10Native stream with an anomalous header, suggesting it is being used to exploit a vulnerability for client execution. The embedded object's path is noted as an IOC.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/I1Vx7Z2.9uzdB 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
e41bdd8210996a13336158ba6ea452405a0a6b999cb4ce7c3abfb90f8aff945f		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/I1Vx7Z2.9uzdB 991744 bytes
ooxml_oleobject_00_ole10native_00.bin
98ae75ffd4a08595e49db28ac0479f87fbcf5f348d8cdaa3da2406d76478eaa8		 ole-package OOXML xl/embeddings/I1Vx7Z2.9uzdB Ole10Native stream: olE10naTiVe 981189 bytes

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