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

Static analysis result for SHA-256 c27ee7916b7471bc…

MALICIOUS

Office (OOXML) / .XLSX

16.4 KB Created: 2021-02-03 07:57:22 UTC Authoring application: Microsoft Excel 15.0300
MD5: 0efad50582a96e6b921b731221f34964 SHA-1: 119a77c497b1aeb2ceeb4b3cdb3f349d7cf09891 SHA-256: c27ee7916b7471bc3bf38a4ce92bb3075972ec46814f3ca0d71dbe24dc495e7d
102 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

The sample is an OOXML file containing an embedded OLE object, specifically identified as an Equation Editor object. High-severity heuristics indicate a potential exploit for CVE-2018-0798, which targets a vulnerability in the Equation Editor. This suggests the file is designed to execute arbitrary code upon opening.

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
  • Suspicious extracted artifact info EXTRACTED_FILE_STATIC_TRIAGE
    One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
ooxml_oleobject_00.bin
9a8e49908f4699446d694f232c42a601c2104efb5a1425f6d377782c3fb3bb18		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/oleObject1.bin 12288 bytes
ooxml_oleobject_00_ole10native_00.bin
916b80f872703c8054632c7c631007f3d37ecc92aeb8220e9f80b073516c619e		 ole-package OOXML xl/embeddings/oleObject1.bin Ole10Native stream: ole10nAtIVE 9604 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact entropy is 7.95, consistent with packed or encrypted content.

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