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

Static analysis result for SHA-256 2acae304e86bd842…

MALICIOUS

Office (OOXML) / .XLSX

517.4 KB Created: 2020-01-20 17:22:23 UTC Authoring application: Microsoft Excel 15.0300
MD5: ade4fafe3e4ad700ee96613b58482e63 SHA-1: 6aa23d5ad853deef048ed181e373f993b838f081 SHA-256: 2acae304e86bd8425ad949b06c8040c80903da088148c17e52e74b9a9de34a76
100 Risk Score

Malware Insights

MITRE ATT&CK
T1204 Malicious File T1204.001 Malicious File: User Execution T1559 Component Object Model Hijacking T1559.001 Component Object Model Hijacking: Component Object Model Hijacking

The file is an Office document containing an embedded OLE object, specifically identified as an Equation Editor object. Heuristics indicate a high likelihood of exploitation for CVE-2018-0798 due to an anomalous Equation Editor native stream with an invalid MTEF version and high entropy. This suggests the document is designed to exploit this vulnerability to execute arbitrary code, likely leading to the download and execution of a second-stage 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
e395f4ca70a85643e08798740ee6cbcaeec2b059c4bb2379dca3305798a26aa5		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/oleObject1.bin 4096 bytes
ooxml_oleobject_00_ole10native_00.bin
da4a6ae903e0ff2371d324945529c312bd449b1de5884ab65c437057307a80c4		 ole-package OOXML xl/embeddings/oleObject1.bin Ole10Native stream: OlE10NaTiVe 1645 bytes

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