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

Static analysis result for SHA-256 e6b4fa0ae53a83d1…

MALICIOUS

Office (OOXML) / .XLSX

736.9 KB Created: 2023-09-27 08:05:40 UTC Authoring application: Microsoft Excel 12.0000 First seen: 2023-10-13
MD5: 344a5a2ee55f21de7499cd30866f5e29 SHA-1: b07f629fa16101cd6c24e6441ac591e4c919f278 SHA-256: e6b4fa0ae53a83d19ef3f6d405af96e3102efa3a71d875fc8b122227409e1431
100 Risk Score

Malware Insights

MITRE ATT&CK
T1559.001 Component Object Model Hijacking T1137.003 DLL Search Order Hijacking

The file is an Excel document containing an embedded OLE object, specifically identified as an 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 designed to execute malicious code. The presence of this anomalous OLE object is the primary indicator of malicious intent.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/PJMZ.URjSgD 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
0c57faeb604872644603eff232c941589c64fe46fd8c1b75362aba0ca5897201		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/PJMZ.URjSgD 999424 bytes
ooxml_oleobject_00_ole10native_00.bin
7286f1d688330c6501dab9c0ad107244470b487f2f6839ed005e77697d544515		 ole-package OOXML xl/embeddings/PJMZ.URjSgD Ole10Native stream: OlE10NATIve 988982 bytes

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