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

Static analysis result for SHA-256 52af06d8b69b7428…

MALICIOUS

Office (OOXML) / .XLSX

701.7 KB Created: 2023-08-03 11:34:29 UTC Authoring application: Microsoft Excel 16.0300 First seen: 2024-08-17
MD5: 0857a9fd10fecac6b8b5a4c8326bc21f SHA-1: 975e8d9502ca8f0a35c9399f8c4e9208a6b2894e SHA-256: 52af06d8b69b7428ec98ded0ef029397f0974de6a8424d53f0c645a65d9d6667
100 Risk Score

Malware Insights

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

The sample is an Excel file 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 size, strongly suggesting it's used to deliver a secondary malicious component. The embedded object's path is also noted as an IOC.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/xpUttq2X.JscVGcs 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
f37e4ede9416b29dc9c4dc6976125fa477520ec4587e81051becf14c8c4c9c7c		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/xpUttq2X.JscVGcs 1014784 bytes
ooxml_oleobject_00_ole10native_00.bin
f77f12c349f8a1ed89031411b50e8f9ad8902c7e470ca76bcf6a69a8216b6e52		 ole-package OOXML xl/embeddings/xpUttq2X.JscVGcs Ole10Native stream: oLe10NatiVE 1004046 bytes

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