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

Static analysis result for SHA-256 6bd06eb285d85763…

MALICIOUS

Office (OOXML) / .XLSX

35.9 KB Created: 2021-12-06 14:45:17 UTC Authoring application: Microsoft Excel 12.0000 First seen: 2022-04-27
MD5: db3bfb6941c9813f1eb08bd485244f92 SHA-1: eb37cf2289685a68d0cce9bb3ecc56fbb991a239 SHA-256: 6bd06eb285d857637236e02687ebc178ac65dd7d66a268d8249573ed95b09030
100 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The file contains an embedded OLE object identified as a Microsoft Equation Editor object. Heuristics indicate a high likelihood of exploitation for CVE-2018-0798, which allows for arbitrary code execution. This technique is commonly used to deliver secondary payloads via spearphishing attachments.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/oleObject1.bin contains the Equation Editor CLSID, the legacy component exploited by CVE-2017-11882, CVE-2018-0802, and CVE-2018-0798.
  • CVE-2018-0798 — anomalous Equation Editor native stream high CVE likely CVE_2018_0798_EQUATION_NATIVE_ANOMALY
    Embedded Equation Editor OLE data contains anomalous native stream bytes consistent with a CVE-2018-0798-style Equation Editor exploit. This is treated as likely CVE evidence because the Equation object is malformed and payload-like, but it does not match the exact public matrix-overflow byte signature.
  • 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
6ebdc30b7a07b6710c9cebbf452a415fccb350d995bd8628540ffb13021278b6		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/oleObject1.bin 4096 bytes
ooxml_oleobject_00_ole10native_00.bin
74dad0a86773566a59cdd3c59d7e818242e9aa758545080e4b89e13a3144f4ac		 ole-package OOXML xl/embeddings/oleObject1.bin Ole10Native stream: ole10NAtivE 1615 bytes

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