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

Static analysis result for SHA-256 921ba277141d9e94…

MALICIOUS

Office (OOXML) / .XLSX

137.3 KB Created: 2020-07-07 21:52:29 UTC Authoring application: Microsoft Excel 16.0300
MD5: 8293460c2806ab65a0cc8bc4b47e8e98 SHA-1: 98cf263010781614b51b6ccdc186876b214bbdf7 SHA-256: 921ba277141d9e94ec4b4c7e1fadcba788a8791ccedeb5feb2702c23b4348a60
100 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

The sample is an Office Open XML spreadsheet containing an embedded OLE object, specifically identified as an Equation Editor object. High-severity heuristics indicate the presence of CVE-2018-0798, a known vulnerability associated with anomalous Equation Editor native streams. This suggests the file is designed to exploit this vulnerability for arbitrary code execution.

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
4695476a29d5de0ad831825049425f5471cf6f05f46757b85393a32f2d2b2b16		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/oleObject1.bin 4608 bytes
ooxml_oleobject_00_ole10native_00.bin
f2a75d1a5b096d5e5b26dc66bc044c46b6504214272422ccf5f47885c6df9836		 ole-package OOXML xl/embeddings/oleObject1.bin Ole10Native stream: OLE10NAtIVE 2271 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.