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

Static analysis result for SHA-256 207a2cccea2713de…

MALICIOUS

Office (OOXML) / .XLSX

767.4 KB Created: 2022-05-16 17:34:45 UTC Authoring application: Microsoft Excel 16.0300 First seen: 2023-01-26
MD5: 0315996e817b582806849b61acad8b90 SHA-1: acdf5ee554514cd1ff179dfff8c1541cefd1697b SHA-256: 207a2cccea2713def3f435ec74d3b2ecc292246c84bf0786cdfa548a15df3673
160 Risk Score

Malware Insights

MITRE ATT&CK
T1559.001 Component Object Model Hijacking

The sample is an Excel spreadsheet containing an embedded OLE object identified as an Equation Editor. This object exhibits anomalies in its Ole10Native stream size, strongly indicating it carries a malicious payload. ClamAV detection further confirms its malicious nature as a downloader trojan.

Heuristics 4

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/IGOYP4p.b56NX 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
1aa05f25f99222ded44940eba4b5992a85db119365ba1288b1453e092172ced5		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/IGOYP4p.b56NX 923136 bytes
ooxml_oleobject_00_ole10native_00.bin
4e346ef24e50620b4bf163cd66ed7d65bfe22aec416b51600c3b0df16ef99372		 ole-package OOXML xl/embeddings/IGOYP4p.b56NX Ole10Native stream: oLE10NAtiVE 913086 bytes
emf_00.emf
38f17a599ac5d645df3840bbb401710ef81573a747da20abbfc1b7d9a9273b58		 ooxml-emf OOXML EMF part: xl/media/image1.emf 169096 bytes

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