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

Static analysis result for SHA-256 33ae0803f11a8563…

MALICIOUS

Office (OOXML) / .XLSX

659.8 KB Created: 2023-08-03 11:34:29 UTC Authoring application: Microsoft Excel 16.0300 First seen: 2023-08-08
MD5: 6ae27a8fe3e12014c33344f69a466d2e SHA-1: 4c10812bbffdb6804120eba868fbe132b93aff44 SHA-256: 33ae0803f11a85637fdfdc0441a7bb20638bc258d42414c9f60b34b6e1129981
100 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.001 Malicious Link T1204.002 Malicious File

The file is an Excel document containing an embedded OLE object, specifically identified as a Microsoft Equation Editor object. High-severity heuristics indicate that this Equation Editor object carries a payload-like Ole10Native stream with an anomalous header, suggesting it's designed to exploit a vulnerability. This is a common delivery mechanism for exploiting Equation Editor vulnerabilities to execute arbitrary code.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/MMB.yU8I 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
34d23a9fc90175864f86ed9615299a6bb5c5291853972bb07a6e79d395e1103b		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/MMB.yU8I 910336 bytes
ooxml_oleobject_00_ole10native_00.bin
6c7f1ebd86b898e88d1642ce78fc78871185888f41a903afa412cc0cb362c6ac		 ole-package OOXML xl/embeddings/MMB.yU8I Ole10Native stream: olE10nAtiVe 900684 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.