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

Static analysis result for SHA-256 0077802837415614…

MALICIOUS

Office (OOXML) / .XLSX

658.4 KB Created: 2023-07-26 19:45:53 UTC Authoring application: Microsoft Excel 12.0000 First seen: 2023-08-24
MD5: 1382304427e82743c664c4119318bf85 SHA-1: 135f2ca64761505f3da282104b2964853d889c40 SHA-256: 00778028374156147cdb9fe8b1acf686f7c09dc0d4ee446cd94357a9c3e4d5d1
100 Risk Score

Malware Insights

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

The sample is an Excel file containing an embedded OLE object, specifically identified as a Equation Editor object. High-severity heuristics indicate that this Equation Editor object carries a payload-like Ole10Native stream with an anomalous header, suggesting exploitation of a vulnerability within the Equation Editor component. This is a common technique for delivering second-stage malware.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/oGkNE.opGduZ contains the Equation Editor CLSID, the legacy component exploited by CVE-2017-11882, CVE-2018-0802, and CVE-2018-0798.
  • Equation Editor object carries payload-like Ole10Native stream high OLE_EQUATION_OLE10NATIVE_PAYLOAD_ANOMALY
    Embedded OLE object declares the Equation Editor CLSID but stores a large high-entropy Ole10Native stream with malformed package sizing. This is an exploit-shaped Equation/OLE payload container seen in malicious OOXML samples. It is not assigned to a specific CVE unless the MTEF/Equation Native primitive also matches.
  • 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
4100b556c52cfd0be040afbb3a310ab58c4e97d222efc94fbc7287090c95174e		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/oGkNE.opGduZ 948736 bytes
ooxml_oleobject_00_ole10native_00.bin
ff3b45f4e1b3d479c33e80d53b00019c13f7c59017aefe12e021904619907e6e		 ole-package OOXML xl/embeddings/oGkNE.opGduZ Ole10Native stream: Ole10NaTIVe 938826 bytes

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