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

Static analysis result for SHA-256 7957180ff4617ade…

MALICIOUS

Office (OOXML) / .XLSX

684.1 KB Created: 2010-06-04 08:55:28 UTC Authoring application: Microsoft Excel 15.0300 First seen: 2023-01-10
MD5: 33168792412761f3dc08383083fa1f00 SHA-1: bc718fcd0eab187034ae68cef5003db18385bbc6 SHA-256: 7957180ff4617adea3c5a18a4f83c6e3f115fdfd48c9e40cd9188ef89812b063
140 Risk Score

Malware Insights

MITRE ATT&CK
T1559.001 Component Object Model Hijacking T1204.001 Malicious Link

The file is an OOXML document containing an embedded OLE object, specifically identified as a Microsoft 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 being used to exploit a vulnerability. The presence of a NOP sled further supports the exploitation of a buffer overflow vulnerability, commonly associated with Equation Editor exploits. No scripts were extracted, and the document body appears to be a legitimate-looking invoice, suggesting the malicious content is entirely within the embedded object.

Heuristics 4

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/1FinI0.bDRDVy contains the Equation Editor CLSID, the legacy component exploited by CVE-2017-11882, CVE-2018-0802, and CVE-2018-0798.
  • NOP sled detected high SC_NOP_SLED
    Found 20+ consecutive 0x90 bytes
  • 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
5ee618db22b912bee2d29a747bde236aa4062ab7e1db8d4fa7136344d46c5a0c		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/1FinI0.bDRDVy 956928 bytes
ooxml_oleobject_00_ole10native_00.bin
1b7f87e67971b92aa0ca0cdf36b543d196d84fc98113d273ec4d90c3df1fecfd		 ole-package OOXML xl/embeddings/1FinI0.bDRDVy Ole10Native stream: OLE10nAtiVE 946751 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.