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

Static analysis result for SHA-256 9da27fa5bc483972…

MALICIOUS

Office (OOXML) / .XLSX

14.0 KB Created: 2023-11-17 18:26:59 UTC Authoring application: Microsoft Excel 12.0000 First seen: 2024-05-28
MD5: 51c83b2de8dfe3ab134836d72c8d947f SHA-1: 6a11c63ec9dade329c6e8c446f2c1a685bab76a1 SHA-256: 9da27fa5bc483972d00f0d5075f2a9a284b0b2da7a0a58aaf10b0ec52c23bd1f
100 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment

The file is an Excel document containing an embedded OLE object, specifically an Equation Editor object. Heuristics indicate a high likelihood of exploitation for CVE-2018-0798, a vulnerability in Equation Editor. The document body presents a seemingly legitimate tax calculation, which is a common lure to trick users into enabling macros. The embedded OLE object is the primary vector for exploitation, likely leading to the download and execution of a secondary payload.

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
07a502d32a6991671ae31d2370f75d54a40094a654fda6c12b8eeac4e706d04d		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/oleObject1.bin 3584 bytes
ooxml_oleobject_00_ole10native_00.bin
88d9f13af47d062ec579304a184bf2c925e875bba67b3569951f41a71ebe8598		 ole-package OOXML xl/embeddings/oleObject1.bin Ole10Native stream: Ole10natIve 1369 bytes

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