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

Static analysis result for SHA-256 bbc3d1122e23de34…

MALICIOUS

Office (OOXML) / .XLSX

700.9 KB Created: 2023-07-26 19:45:53 UTC Authoring application: Microsoft Excel 12.0000 First seen: 2023-08-24
MD5: 8bb2875dcbb904f03b1e84011fa1eae0 SHA-1: 59bbf43df8ef845ea8be423776e8b222aa7594ad SHA-256: bbc3d1122e23de3422b3d16471231c725a5114509dac4c8a5d601f23c1958b35
100 Risk Score

Malware Insights

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

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 exploitation of a vulnerability within the Equation Editor component. This points to a likely attack pattern of exploiting client-side vulnerabilities to execute arbitrary code.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/kLFE.c0U2 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
789e3f9032f8271fa37c2618a5624173ca8c090884874f2c53cec34f757a1b58		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/kLFE.c0U2 966656 bytes
ooxml_oleobject_00_ole10native_00.bin
1a45f3577c35f5314e7ecbeb83864f2c1c26b3043213ad6bbd31054667bce1f2		 ole-package OOXML xl/embeddings/kLFE.c0U2 Ole10Native stream: oLe10NatiVE 956600 bytes

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