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

Static analysis result for SHA-256 06a77a301ec7e5b0…

MALICIOUS

Office (OOXML) / .XLSX

1.12 MB Created: 2021-09-22 12:07:42 UTC Authoring application: Microsoft Excel 12.0000
MD5: e116bc8d1d4b00bb6b4c0d77cf9b7f6f SHA-1: 715d6d7abc74f7d7b9a3741f05e5efc6f92b9925 SHA-256: 06a77a301ec7e5b0ffde60c193b25f83ae835db7561bd1fc2438bb69d6c5e85a
140 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

The sample is an Excel file containing an embedded OLE object, specifically identified as a Microsoft Equation Editor object. High-severity heuristics indicate that this object carries a payload and exploits CVE-2018-0798, suggesting it's designed to execute arbitrary code upon opening.

Heuristics 4

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/qVDYtg.kIenFx 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.
  • 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
87a7408decc7253e93ec0c862d89d4e9f03e5c8bfc60704cfdf1a6ddc638d2a8		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/qVDYtg.kIenFx 1511424 bytes
ooxml_oleobject_00_ole10native_00.bin
4771de821c502f59ca242b26cd0a3fbac4bee6da5a8087ca24f2232c5016a574		 ole-package OOXML xl/embeddings/qVDYtg.kIenFx Ole10Native stream: Ole10Native 1496875 bytes

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