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

Static analysis result for SHA-256 5abb069cba6a31d1…

MALICIOUS

Office (OOXML) / .XLSX

613.1 KB Created: 2023-07-26 19:45:53 UTC Authoring application: Microsoft Excel 12.0000 First seen: 2023-10-20
MD5: 1415c02c14a94648b99c4208843aa592 SHA-1: 609cce9b7266cf5e912702bdf4654186f8a590ea SHA-256: 5abb069cba6a31d1e553b446bfeb6d0c419ad9e64ccf9477f9521d8896040822
100 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious File

The file is an Excel document 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, suggesting it's being used to exploit a vulnerability. This is a common delivery mechanism for malicious documents.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/fC94.Ba1O 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
4accfc1a666587bfcb618e008c75a86f592de39f028fee0734459c5e6a234390		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/fC94.Ba1O 840192 bytes
ooxml_oleobject_00_ole10native_00.bin
fb174f2a43cfe321dacce2ca0c5ab1f30d5323693d8e244a9229ea489a4d5113		 ole-package OOXML xl/embeddings/fC94.Ba1O Ole10Native stream: OLE10NAtIve 831320 bytes

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