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

Static analysis result for SHA-256 31ec13333c42a317…

MALICIOUS

Office (OOXML) / .XLSX

729.7 KB Created: 2023-09-27 08:05:40 UTC Authoring application: Microsoft Excel 12.0000 First seen: 2023-09-29
MD5: 201cd0a2fc6a87d25d6aed1e975fae71 SHA-1: ceccbf7e0dfb69dda31c49b218989b8894f5b48c SHA-256: 31ec13333c42a317cbfb1309873e4c2e548fd43b4384d7fec3783ce6b462aeed
100 Risk Score

Malware Insights

MITRE ATT&CK
T1559.001 Component Object Model Hijacking T1204.001 Malicious Link

The file contains an embedded OLE object, specifically identified as a Microsoft Equation Editor object. Heuristics indicate that this Equation Editor object carries a payload-like Ole10Native stream with an anomalous header, suggesting it's being used to deliver malicious content. The presence of this object points to an exploitation attempt targeting the Equation Editor component.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/aA9iM.EK 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
23d3b83f648e326dec6d3d703c86e7ce32eb615455e0f93132dd04f1e867eb6c		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/aA9iM.EK 1037824 bytes
ooxml_oleobject_00_ole10native_00.bin
d95353e7ff873fbde87ceeaca6deedad8564aa5f97e85ef0847980b0ea408fd2		 ole-package OOXML xl/embeddings/aA9iM.EK Ole10Native stream: ole10natIvE 1027565 bytes

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