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

Static analysis result for SHA-256 17313e70d5ecec58…

MALICIOUS

Office (OOXML) / .XLSX

777.3 KB Created: 2023-01-19 05:24:18 UTC Authoring application: Microsoft Excel 16.0300 First seen: 2023-04-18
MD5: 9d195e83472eec7bf6fc7a229f85cd4a SHA-1: 14ebffe3d525e83edde69991baef9a5c296c2f11 SHA-256: 17313e70d5ecec5827f4d24f992a3f493b01537f1bfb656b343b5643f067692d
140 Risk Score

Malware Insights

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

The XLSX file contains an embedded OLE object, specifically an Equation Editor object, which exhibits anomalies indicative of CVE-2018-0798. This suggests the file is designed to exploit this vulnerability to execute a secondary payload. The embedded object's native stream contains payload-like data, further supporting this conclusion.

Heuristics 4

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/vnme.oqU 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.
  • 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
1182d0e595ab3e1a4f14749b00a5e8cec78f5ace1dab23b9eb3155712ee5d89f		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/vnme.oqU 1058304 bytes
ooxml_oleobject_00_ole10native_00.bin
7d705cc4d001165181342aa60171e0edf1a4f105c6a8493e3cacc7f22b3b02a2		 ole-package OOXML xl/embeddings/vnme.oqU Ole10Native stream: Ole10natIVe 1047324 bytes

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