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

Static analysis result for SHA-256 1b18db45bd47fcb3…

MALICIOUS

Office (OOXML) / .XLSX

696.4 KB Created: 2023-07-26 19:45:53 UTC Authoring application: Microsoft Excel 12.0000 First seen: 2023-08-25
MD5: a1db675acf65b2c9c73deca075bea9b7 SHA-1: bb92ae34c971ed37157824d233ab69ca5eda99e3 SHA-256: 1b18db45bd47fcb35d17c01d27f86a5f1adca9c54727555e297af3606c56da4d
100 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Phishing: Spearphishing Attachment T1204.001 Malicious Link: Malicious File

The XLSX file contains an embedded OLE object, specifically identified as a Microsoft Equation Editor object. This object exhibits an anomaly where the Ole10Native stream appears to contain a payload, indicated by an unusually large declared size and high entropy. This strongly suggests the file is designed to exploit a vulnerability within the Equation Editor to execute arbitrary code.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/ByHWgFHF.Ss2m 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
d34a4b86218d78d19f6ef93dc27802d3b80d24db65abe0fbf224b5239f2855c0		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/ByHWgFHF.Ss2m 1028608 bytes
ooxml_oleobject_00_ole10native_00.bin
d6d3562b23b086af2f5e791284b1dd5821a15afa1f3543e6dbf1290d97c2681e		 ole-package OOXML xl/embeddings/ByHWgFHF.Ss2m Ole10Native stream: Ole10naTIvE 1018244 bytes

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