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

Static analysis result for SHA-256 6a6dbd968531e4ac…

MALICIOUS

Office (OOXML) / .XLSX

672.5 KB Created: 2023-07-26 19:45:53 UTC Authoring application: Microsoft Excel 12.0000 First seen: 2023-08-09
MD5: 29db88e325ae5e1689130f70dedb46d4 SHA-1: 7e84aea44237ea3e55d7b6ecb042f61e65d92098 SHA-256: 6a6dbd968531e4acd0e5a66f3429280c4c96dc6b73cd5e0dfd68ac39a5187015
100 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment 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 size difference, strongly suggesting exploitation of a vulnerability within the Equation Editor component. This is a common delivery mechanism for malware.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/VQirnVl7.mKT7 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
e12dd5ec8d02967d4034c689ac7a05fa7eef1f6513fcd99d6a10ebb0bb8e6788		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/VQirnVl7.mKT7 989696 bytes
ooxml_oleobject_00_ole10native_00.bin
acd93ce5958b4d6b2a4c7865b361f33e1e7f020d87f8cf31f74d825245e729ce		 ole-package OOXML xl/embeddings/VQirnVl7.mKT7 Ole10Native stream: OlE10NatIvE 979278 bytes

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