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

Static analysis result for SHA-256 5b752a0921fe5d93…

MALICIOUS

Office (OOXML) / .XLSX

617.7 KB Created: 2023-07-26 19:45:53 UTC Authoring application: Microsoft Excel 12.0000 First seen: 2023-10-11
MD5: 5f853e929eca2cb14b3b36629bedef3a SHA-1: fe12d7c6573c93471d03978320950fe65aa0619a SHA-256: 5b752a0921fe5d9386187091ada9852c357323beb55815406c2998a47a2a24f7
100 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The XLSX file contains 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, suggesting it's designed to exploit a vulnerability. This is a common delivery mechanism for malware, often initiated by a user opening a malicious attachment.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/TVdvkC.4gbk2c 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
feeae5a46063166e087c891c6b8a28dc5df04b11ec9aa0d3fe6b9dcff5b22a44		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/TVdvkC.4gbk2c 860160 bytes
ooxml_oleobject_00_ole10native_00.bin
33a9ef0f2e7b2f59a5d9f8ca61018096510364fd066c3376dd5e25c31b45e7bd		 ole-package OOXML xl/embeddings/TVdvkC.4gbk2c Ole10Native stream: Ole10nAtIvE 850760 bytes

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