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

Static analysis result for SHA-256 66421935a322a352…

MALICIOUS

Office (OOXML) / .XLSX

723.3 KB Created: 2022-05-16 17:34:45 UTC Authoring application: Microsoft Excel 16.0300 First seen: 2023-07-12
MD5: 72323909bf2f3e9d4f1a585bccc93233 SHA-1: e70cd28849fd32f4b22030688b8568acdf8ce5f3 SHA-256: 66421935a322a3520de343e98d4c7bd3f8daf5adebd9910b702c10a9e9270aeb
120 Risk Score

Malware Insights

MITRE ATT&CK
T1559.001 Component Object Model Hijacking

The critical ClamAV detection indicates this XLSX file is a downloader. The presence of an embedded OLE object, specifically identified as an Equation Editor object, is a common technique for exploiting vulnerabilities or delivering secondary payloads. The file's structure and the nature of the embedded object strongly suggest it is designed to execute malicious code.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/yV0L9.Rxv6 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
  • 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
2f027f3876c21077c59779ab31bc7e7ca9cd72c11c98c5cc6dccfd2742be9f7b		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/yV0L9.Rxv6 860672 bytes
ooxml_oleobject_00_ole10native_00.bin
3d524a1ef0ee2087bf3d2dfc15fde526a4f6424475f0d192c2bd66bff6bf3147		 ole-package OOXML xl/embeddings/yV0L9.Rxv6 Ole10Native stream: ole10NatIve 851076 bytes
emf_00.emf
38f17a599ac5d645df3840bbb401710ef81573a747da20abbfc1b7d9a9273b58		 ooxml-emf OOXML EMF part: xl/media/image1.emf 169096 bytes

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