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

Static analysis result for SHA-256 e3bde29649e78628…

MALICIOUS

Office (OOXML) / .XLSX

742.5 KB Created: 2010-06-04 08:55:28 UTC Authoring application: Microsoft Excel 15.0300 First seen: 2023-08-14
MD5: 0f888017391412ed74630d58f38329df SHA-1: 42c9b2e67687c24a5b7303cb02b5cc1f529bbb49 SHA-256: e3bde29649e78628ba3f6d42debd30f5e06cd4e4c7a785044459cf128ce23dc7
100 Risk Score

Malware Insights

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

The sample is an OOXML file containing an embedded OLE object, specifically identified as a 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 size than the actual stream size. This strongly suggests the exploitation of a known vulnerability within the Equation Editor component to execute arbitrary code. The document body appears to be a fabricated invoice or order form, potentially a lure to encourage opening the malicious content.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/UUiBZV3Ky.mNSxry 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
fadbabb07c5f3abbba10a8f78b498b2a0b883431bc4539d9e084dffa337e7990		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/UUiBZV3Ky.mNSxry 1045504 bytes
ooxml_oleobject_00_ole10native_00.bin
74d19de75da73e45a37f205605835a9cdceb1e6ee4a3038e68bddb627fdd7a7b		 ole-package OOXML xl/embeddings/UUiBZV3Ky.mNSxry Ole10Native stream: OLe10natIvE 1034888 bytes

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