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

Static analysis result for SHA-256 6b94359ff9e52e68…

MALICIOUS

Office (OOXML) / .XLSX

711.1 KB Created: 2023-08-03 11:34:29 UTC Authoring application: Microsoft Excel 16.0300 First seen: 2023-08-12
MD5: 6a373679c025b8c65a2fc48d4d95fc23 SHA-1: 2e12a7c1d945e52572d9a3d4eea05130229c6d5e SHA-256: 6b94359ff9e52e68ff9b8baacd1a4e8bc85e796be02e1dcd47e74d72f666ccfa
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. This object exhibits an anomaly where the Ole10Native stream is unusually large and contains a payload, strongly indicating exploitation of a known vulnerability within the Equation Editor. The embedded object is likely used to download and execute a second-stage payload.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/Q8GnMLo.8h0lOx 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
aaa50f20cee30c1f158302b7a2793c5e0c19dc7c3b727a37f1f587767f9a516d		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/Q8GnMLo.8h0lOx 1051648 bytes
ooxml_oleobject_00_ole10native_00.bin
d4630b45bbcbece8326371fa73d784502b444d90da472b5b297828917b54b953		 ole-package OOXML xl/embeddings/Q8GnMLo.8h0lOx Ole10Native stream: ole10NativE 1040697 bytes

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