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

Static analysis result for SHA-256 55ad697bd3679db7…

MALICIOUS

Office (OOXML) / .XLSX

744.9 KB Created: 2023-07-26 19:45:53 UTC Authoring application: Microsoft Excel 12.0000 First seen: 2023-08-17
MD5: 5196fa61d8cae824e3fb75c2c8c2451f SHA-1: 7b3baec75caa093b17a740367ecd915cfc7b093b SHA-256: 55ad697bd3679db714895660a648c23659e4c5bb5a339fa274cb13cbeaa24038
100 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is an OOXML file containing an embedded OLE object, specifically identified as a 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 being used to exploit a vulnerability for code execution. The presence of this embedded malicious object points to an attack pattern involving exploitation of the Equation Editor. No document body or scripts were extracted, limiting further analysis of the specific payload.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/xjrpla.opaN 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
8973609f50ad2dba020560b066eadc4620362b33828a90178bad4880b2da7ff4		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/xjrpla.opaN 1029632 bytes
ooxml_oleobject_00_ole10native_00.bin
fc723934f73250adca6d39cdddeda9a5159a05055310ce12c4561b883d987c17		 ole-package OOXML xl/embeddings/xjrpla.opaN Ole10Native stream: ole10naTive 1018933 bytes

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