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

Static analysis result for SHA-256 c5a82c20628b62b7…

MALICIOUS

Office (OOXML) / .XLSX

628.6 KB Created: 2023-07-26 19:45:53 UTC Authoring application: Microsoft Excel 12.0000 First seen: 2023-09-06
MD5: c928d45f297837909b1521115acc1601 SHA-1: 944b206a115808c5addf6897bc2912ac4229b375 SHA-256: c5a82c20628b62b7d469f3c8efe0c58ec8bf03aed92e2a4187f76831ba7050c6
100 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious File

The XLSX file contains an embedded OLE object, specifically identified as a Equation Editor object. This object exhibits anomalies in its Ole10Native stream, indicating it likely carries a malicious payload. The presence of this exploit suggests an attempt to compromise the user's system upon opening the document.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/UnQTX.HH 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
89600dc3ba2e5073c18ddee57adedc7c92f374101d5ef90b4940515c3b5c1339		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/UnQTX.HH 910848 bytes
ooxml_oleobject_00_ole10native_00.bin
a0a3c7eeba6fe98ce0cd42615bf8eac7ea72cf3d7a212e617504aa3093f43068		 ole-package OOXML xl/embeddings/UnQTX.HH Ole10Native stream: olE10NAtivE 901535 bytes

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