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

Static analysis result for SHA-256 a87c8f2063f2ba07…

MALICIOUS

Office (OOXML) / .XLSX

712.3 KB Created: 2023-08-03 11:34:29 UTC Authoring application: Microsoft Excel 16.0300 First seen: 2024-06-13
MD5: 19490cb1b6c17efb725a62291466b702 SHA-1: 2f3abd1980398f9a96206413e91a79e3251e4333 SHA-256: a87c8f2063f2ba073b676186e9a46f46ba2c33f60db346ebca20543ff54715e2
100 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious File

The file is an Excel spreadsheet containing an embedded OLE object, specifically identified as a Equation Editor object. Heuristics indicate that this Equation Editor object carries a payload-like Ole10Native stream with an anomalous header and a significantly larger declared inner size than the actual stream size, strongly suggesting exploitation of a vulnerability like CVE-2017-11882. This indicates the file is designed to exploit the Equation Editor vulnerability to execute a malicious payload.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/Ob1qaR.Sb 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
9626284cb9076fe8e0c5bde4c8224543d42a266fbeb46c06be55c493dbd0878c		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/Ob1qaR.Sb 997376 bytes
ooxml_oleobject_00_ole10native_00.bin
0719b010dcbcd06b74a6e4a2204dbc382bc7784ccfb90c58177147dd39ccb2fb		 ole-package OOXML xl/embeddings/Ob1qaR.Sb Ole10Native stream: Ole10naTive 986678 bytes

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