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

Static analysis result for SHA-256 ffa06b14c46d0dac…

MALICIOUS

Office (OOXML) / .XLSX

641.3 KB Created: 2023-08-03 11:34:29 UTC Authoring application: Microsoft Excel 16.0300 First seen: 2023-08-30
MD5: 448c75e944582d3b771da046d14826a2 SHA-1: 0974f6440f39cfd7a07e9bc3cd766731e05027f7 SHA-256: ffa06b14c46d0dac527ec95afc1498a5264fd0176526cec2cfe63d49f97d63e7
100 Risk Score

Malware Insights

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

The file contains an embedded OLE object, specifically identified as a malicious Equation Editor object. This object carries a payload-like Ole10Native stream with an anomalous size, indicating it's likely designed to exploit a vulnerability. The presence of these elements strongly suggests the file's purpose is to deliver a secondary malicious payload via the Equation Editor vulnerability.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/zeWTHbKH.WPraqh 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
a28b4c6cb785f0ca38e94e558818a290710d69a00f74a7141871621c652f9f79		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/zeWTHbKH.WPraqh 913920 bytes
ooxml_oleobject_00_ole10native_00.bin
fcf7382c9f53572e9e8be811eb66b4f4f2b95d339bcffffd33715fd4b979394c		 ole-package OOXML xl/embeddings/zeWTHbKH.WPraqh Ole10Native stream: OLe10NATiVE 904445 bytes

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