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

Static analysis result for SHA-256 ae61e1c99edce8b1…

MALICIOUS

Office (OOXML) / .XLSX

705.6 KB Created: 2023-08-03 11:34:29 UTC Authoring application: Microsoft Excel 16.0300 First seen: 2024-08-01
MD5: 770560e823be0262f67d3979d2144985 SHA-1: 9fa9df6b5f04975490ae66bd7365d011af4e3ed2 SHA-256: ae61e1c99edce8b1fe2ed791c93c6d932fb4538e951c27a8252ee7f9eee6d112
100 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution T1559.001 Component Object Model Hijacking

The file contains an embedded OLE object, specifically identified as a Equation Editor object with an anomalous Ole10Native stream. This strongly suggests exploitation of a vulnerability within the Equation Editor component to execute a payload. The anomaly in the Ole10Native stream size indicates a potential shellcode or exploit payload embedded within the object.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/QBs.8re7Ao 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
53bde814d6ae19ae2d8cd0cee3d2faaa9186ab2fd459f2a1693a86fbd76a32aa		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/QBs.8re7Ao 1049088 bytes
ooxml_oleobject_00_ole10native_00.bin
828d5d1a4e804d251a595aade76be9397819ea3f0ad3674fa102edd5ed0f6837		 ole-package OOXML xl/embeddings/QBs.8re7Ao Ole10Native stream: OLe10nAtiVE 1038404 bytes

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