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

Static analysis result for SHA-256 a6900bc0c83a0451…

MALICIOUS

Office (OOXML) / .XLSX

13.5 KB Created: 2019-11-27 09:20:57 UTC Authoring application: Microsoft Excel 12.0000 First seen: 2023-08-30
MD5: b8aae7504efb90d7a8e86e114f4e772c SHA-1: 3edf8be1c198a0e3878c646d6e599db9d84cd76e SHA-256: a6900bc0c83a045164190ef67c99f9ca4c4a9d2b3c8e9b863716ce7a1f2dfb79
120 Risk Score

Malware Insights

MITRE ATT&CK
T1204 User Execution T1204.002 User Execution: Malicious File

The file is an Excel document containing an embedded OLE object, specifically an Equation Editor object. Heuristics indicate this object is anomalous and exploits CVE-2018-0798. The document body presents a list of parts, acting as a lure to encourage users to enable macros, a common tactic for malware droppers. The embedded OLE object is the likely vector for payload delivery.

Heuristics 4

  • 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
  • Macro/content-enable lure medium SE_ENABLE_LURE
    Document instructs the user to enable macros or editing — a common technique used by malware droppers to bypass Office macro security settings

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
ooxml_oleobject_00.bin
8ede19ce15f4a4fc46855e3f93203795a8c1620bbc0ea97adbb77db05ba2dbd4		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/oleObject1.bin 3584 bytes
ooxml_oleobject_00_ole10native_00.bin
b1453462155db7af855d2754f8d105d86cbc965ced4e5474baf7eafb914a54b7		 ole-package OOXML xl/embeddings/oleObject1.bin Ole10Native stream: Ole10nATIve 1523 bytes

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