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

Static analysis result for SHA-256 425249c134b857f2…

MALICIOUS

Office (OOXML) / .XLSX

679.9 KB Created: 2023-08-23 01:53:10 UTC Authoring application: Microsoft Excel 15.0300 First seen: 2023-08-24
MD5: 4f035564e75b14009c2c1baf430a120a SHA-1: 6d6d09d95e7eab1beaac925fdbfd4df0ef4b8fd3 SHA-256: 425249c134b857f219d9f40557c4d515e79b3d065f713fc153e6c3fc12f07442
100 Risk Score

Malware Insights

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

The sample is an Excel file containing an embedded OLE object, specifically identified as an Equation Editor object. High-severity heuristics indicate that this Equation Editor object carries a payload-like Ole10Native stream with an anomalous header, suggesting it's designed to exploit a vulnerability for client execution. The embedded OLE object and its anomalous stream are the primary indicators of malicious intent.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/by34TN2lg.wdiQ 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
504afd3d64c7b34ccc55d9717e66e572afee1430f0f74b187d5a75ea4fdb2be1		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/by34TN2lg.wdiQ 922112 bytes
ooxml_oleobject_00_ole10native_00.bin
169060d6e9c6360c5025e1070b2b3211e077b430cb32c3d35f019ac386b282fc		 ole-package OOXML xl/embeddings/by34TN2lg.wdiQ Ole10Native stream: olE10NATIVe 912019 bytes

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