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

Static analysis result for SHA-256 d1acfa41b1e1fbc0…

MALICIOUS

Office (OOXML) / .XLSX

17.9 KB Created: 2021-04-28 14:40:56 UTC Authoring application: Microsoft Excel 15.0300
MD5: 427e80f30505c596c822c141283a5a70 SHA-1: d910f9e9ecf2cb8c68f8fca4121bac4bad757a37 SHA-256: d1acfa41b1e1fbc076b41547954e6615132256983b0315c50f8dbb97a0399fbd
100 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution T1559.001 Component Object Model Hijacking

The sample is an Excel document containing an embedded OLE object, specifically identified as a Microsoft Equation Editor object. High-severity heuristics indicate the presence of an anomaly associated with CVE-2018-0798, suggesting exploitation of this vulnerability for arbitrary code execution. No document body or scripts were extracted, but the presence of the vulnerable Equation Editor component is sufficient to infer the attack pattern.

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
1b673155bd6bc9663dc0ba7cd45105209bd088a860d89b7fbe8c9a70ae00a660		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/oleObject1.bin 4096 bytes
ooxml_oleobject_00_ole10native_00.bin
380604e04721e1043a60916c325af11d04182b25dfefde59ab4ebe739a0f3674		 ole-package OOXML xl/embeddings/oleObject1.bin Ole10Native stream: OlE10NAtiVe 1644 bytes

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