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

Static analysis result for SHA-256 4c123b20e9d7153b…

MALICIOUS

Office (OOXML) / .XLSX

695.4 KB Created: 2022-08-10 18:51:50 UTC Authoring application: Microsoft Excel 16.0300 First seen: 2024-08-09
MD5: ed545f9880836d7ae158919de9e4562b SHA-1: 9a6c87c8b15ca411e137a65f01f0b8ca0c39277c SHA-256: 4c123b20e9d7153b2dffeea2554be439a4f6405631633a369cd2fb3caa23c3fa
100 Risk Score

Malware Insights

MITRE ATT&CK
T1559.001 Component Object Model Hijacking T1204.002 Malicious File

The sample is an XLSX file containing an embedded OLE object, specifically identified as a Microsoft 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 being used to exploit a vulnerability. The document body content, appearing as a purchase order, is likely a lure to trick users into opening the malicious object.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/0Wnj.j3WD 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
b8886bddc644a8d670692f4993c876d1a37410b83abd5e7300eaf80c9b7d4412		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/0Wnj.j3WD 1002496 bytes
ooxml_oleobject_00_ole10native_00.bin
711968b2753d07b088de00878c5133d5512545a604407a70beeef434d12c75bc		 ole-package OOXML xl/embeddings/0Wnj.j3WD Ole10Native stream: OlE10nATIve 991912 bytes

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