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

Static analysis result for SHA-256 4ad044b7c48570f2…

MALICIOUS

Office (OOXML) / .XLSX

587.8 KB Created: 2023-07-26 19:45:53 UTC Authoring application: Microsoft Excel 12.0000 First seen: 2023-09-07
MD5: 58933352559256473f67bff752931893 SHA-1: 7b8c269c8f07ebec76bf16eca4cf6678f3a66de3 SHA-256: 4ad044b7c48570f292ba1439c50d031dc93fef51e247076e7267d0f17c6dd975
100 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.001 Malicious Link T1204.002 Malicious File

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 size and header. This strongly suggests the exploitation of a known vulnerability in Equation Editor to execute arbitrary code, likely leading to the download and execution of a second-stage payload.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/jlAtdcCJ4.0GSskBU 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
5450756f0a74767fbf510720379e3f8dd881031f82dec5570bd4889eda6d19f5		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/jlAtdcCJ4.0GSskBU 841728 bytes
ooxml_oleobject_00_ole10native_00.bin
4d100dc7e70b18be4fb84a93e354a26a82ae3ee2443e82a289117902fd4eff9e		 ole-package OOXML xl/embeddings/jlAtdcCJ4.0GSskBU Ole10Native stream: ole10NAtIVE 832821 bytes

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