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

Static analysis result for SHA-256 c5daed8b0f7b946a…

MALICIOUS

Office (OOXML) / .XLSX

725.3 KB Created: 2010-06-04 08:55:28 UTC Authoring application: Microsoft Excel 15.0300 First seen: 2023-08-12
MD5: 0137b3ecea2c0e75ae9e6553b4508abc SHA-1: cacc898d7830128322f940dbcc2ba3391acc1bf4 SHA-256: c5daed8b0f7b946a0f56b0b7ade63423eea5c37391bcec98cca36bc043e648ad
140 Risk Score

Malware Insights

MITRE ATT&CK
T1559.001 Component Object Model Hijacking T1204.002 Malicious File

The file is an OOXML document containing an embedded OLE object, specifically identified as a Microsoft Equation Editor exploit. High-severity heuristics indicate an anomaly in the Equation Editor object's payload size, suggesting it carries a malicious payload. The embedded OLE object is the primary vector for exploitation, likely leading to the execution of a secondary stage.

Heuristics 4

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/NdPMsgrRS.l3yHplN contains the Equation Editor CLSID, the legacy component exploited by CVE-2017-11882, CVE-2018-0802, and CVE-2018-0798.
  • NOP sled detected high SC_NOP_SLED
    Found 20+ consecutive 0x90 bytes
  • 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
62394f4e41acc5c7f986f1827dcc9d5df77bd05783a1b64e89510ceb17e60766		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/NdPMsgrRS.l3yHplN 995840 bytes
ooxml_oleobject_00_ole10native_00.bin
fce2de0fceab3f1562bb332809094e11b9e057a303f87d5c1a7ac3cec007aff6		 ole-package OOXML xl/embeddings/NdPMsgrRS.l3yHplN Ole10Native stream: oLe10NAtIVE 985497 bytes

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