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

Static analysis result for SHA-256 d300bd3ed7461b1c…

MALICIOUS

Office (OOXML) / .XLSX

672.3 KB Created: 2023-08-03 11:34:29 UTC Authoring application: Microsoft Excel 16.0300 First seen: 2023-08-26
MD5: 33e8fb7aa9f005ccb2e9fb681f087366 SHA-1: b45c204899eb12874dca86cc7b4e12af7dbe5dba SHA-256: d300bd3ed7461b1c05c983a03ab34d07e23f8233bebab33c52631303de624c1a
100 Risk Score

Malware Insights

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

The file is an Excel spreadsheet containing an embedded OLE object, specifically identified as a malicious Equation Editor object. This object carries a payload-like Ole10Native stream with an anomalous header, indicating it's designed to exploit vulnerabilities. The presence of these indicators strongly suggests the file is a malicious document leveraging the Equation Editor vulnerability to deliver a secondary payload.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/fR2.rP 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
765eeac68f8c0f467d4367fcd91e22f6a6890108a90b8051271ee31f16ab43d1		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/fR2.rP 969728 bytes
ooxml_oleobject_00_ole10native_00.bin
ca2f04a331fc6372ea9c38cd66cf962a866e72d422afbe7282cdefd32f310942		 ole-package OOXML xl/embeddings/fR2.rP Ole10Native stream: oLE10nAtIVe 959795 bytes

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