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

Static analysis result for SHA-256 29b8a1561a1afb81…

MALICIOUS

Office (OOXML) / .XLSX

8.7 KB Created: 2021-04-28 14:40:56 UTC Authoring application: Microsoft Excel 15.0300
MD5: 87ab92d4a11478f75eb2a73a19c7fea9 SHA-1: f92e3f82cc065d9105cfa235249b1662dc56aa47 SHA-256: 29b8a1561a1afb81864d4f1e1eef0f9782b44ebdb65f166e966cba6b8a848a42
100 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 an anomaly consistent with CVE-2018-0798, a vulnerability in Equation Editor that allows for arbitrary code execution. This suggests the file is designed to exploit this vulnerability upon opening.

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
6e8388a96c0bae6c42b026b21b474bb2aec93fef749560ba6ee4153739f66e5c		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/oleObject1.bin 4096 bytes
ooxml_oleobject_00_ole10native_00.bin
a192b3af1b8f8766b958a926d359da01fe6142aaa2bdb121dcb61d9712641f2e		 ole-package OOXML xl/embeddings/oleObject1.bin Ole10Native stream: OLE10NaTIVE 1689 bytes

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