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

Static analysis result for SHA-256 4981af2bd01d0389…

MALICIOUS

Office (OOXML) / .XLSX

625.8 KB Created: 2010-06-04 08:55:28 UTC Authoring application: Microsoft Excel 15.0300 First seen: 2023-08-06
MD5: 3314cbfbd906c3f407388544d1f536f2 SHA-1: 093912c8bb75a77aa588ca510005e6755f2e3a82 SHA-256: 4981af2bd01d0389723d12cfba4550be4ee67257193caa813271cb539b6decef
100 Risk Score

Malware Insights

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

The file is an OOXML document 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 and a significantly larger declared inner size than the actual stream size, strongly suggesting exploitation of a vulnerability within the Equation Editor. This technique is commonly used to execute arbitrary code or download further malicious content.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/9jCO.BtQ 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
6889b065b3933c0ae1e74c3369fb244c0eace2bffbbd704a2a72a923f98ce30c		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/9jCO.BtQ 872960 bytes
ooxml_oleobject_00_ole10native_00.bin
60b87ae24254b5518cb1a4697988f7fdb47ac9aa026c190b779497d80d925daa		 ole-package OOXML xl/embeddings/9jCO.BtQ Ole10Native stream: OlE10naTIVE 863401 bytes

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