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

Static analysis result for SHA-256 1123d1a9fb223ce3…

MALICIOUS

Office (OOXML) / .XLSX

803.9 KB Created: 2022-05-16 17:34:45 UTC Authoring application: Microsoft Excel 16.0300 First seen: 2023-06-21
MD5: 3096d0d442d7b081a9e70832e2cb67b9 SHA-1: 7487ee7df28f0708a8d4f73baa63b57ea0938bdb SHA-256: 1123d1a9fb223ce34ed96dfe7f5d94c51621efb65e43aae8aa19e20b523768e7
160 Risk Score

Heuristics 4

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/CqmqcO3a.Iy9 contains the Equation Editor CLSID, the legacy component exploited by CVE-2017-11882, CVE-2018-0802, and CVE-2018-0798.
  • ClamAV: Xls.Downloader.Trojan-aa0b8f388d8573cd-aa0b8f388d8573cd-9950439-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Xls.Downloader.Trojan-aa0b8f388d8573cd-aa0b8f388d8573cd-9950439-0
  • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
ooxml_oleobject_00.bin
a7b1f0556df6623ad2138cc64b70cd661d1f504435bdb1be4abaa36aa92dad06		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/CqmqcO3a.Iy9 910336 bytes
ooxml_oleobject_00_ole10native_00.bin
089aa4c1eb151345a7a3322386432437e9759917a2aee19dd5948928054b15d9		 ole-package OOXML xl/embeddings/CqmqcO3a.Iy9 Ole10Native stream: Ole10NATIVE 900812 bytes
emf_00.emf
38f17a599ac5d645df3840bbb401710ef81573a747da20abbfc1b7d9a9273b58		 ooxml-emf OOXML EMF part: xl/media/image1.emf 169096 bytes

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