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

Static analysis result for SHA-256 eba2c5a4b3c6c128…

MALICIOUS

Office (OOXML) / .XLSX

737.4 KB Created: 2021-12-06 14:45:17 UTC Authoring application: Microsoft Excel 12.0000 First seen: 2022-06-23
MD5: a132af2db1a6e4b33d535da93b9d2be1 SHA-1: 40e8a95da640196f6867bb135d603fd2fb93c032 SHA-256: eba2c5a4b3c6c128e6bf8cd6cd5635851737b12246cbfd0615cd9b25775990ad
100 Risk Score

Malware Insights

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

The sample is an Excel file 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 and size discrepancy, strongly suggesting exploitation of a vulnerability within the Equation Editor. This is a common delivery mechanism for malware.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/ZqAQs4ECu.40n 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
bfd61367123f412f3361757f7d487a5faad13ac8214113eed9a0d4a8e592cbbf		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/ZqAQs4ECu.40n 1045504 bytes
ooxml_oleobject_00_ole10native_00.bin
de7e29cf819c7955fce33fb702e8ff173b192cd46a9e8b13fd7d2b91e23800f5		 ole-package OOXML xl/embeddings/ZqAQs4ECu.40n Ole10Native stream: OLE10naTIVE 1034843 bytes

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