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

Static analysis result for SHA-256 a1e7ec48d7c3132b…

MALICIOUS

Office (OOXML) / .XLSX

659.1 KB Created: 2023-10-22 21:01:35 UTC Authoring application: Microsoft Excel 16.0300 First seen: 2023-10-23
MD5: 8d965b31bba820bbdd511c2591e22a1c SHA-1: 0fc3f724decb761c24f99d66f46919c19aa27e21 SHA-256: a1e7ec48d7c3132bf44925c62cb501b68404d386770e08ea971f22404b27d08b
100 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.001 Malicious Link

The sample is an Excel file containing an embedded OLE object, specifically identified as a Equation Editor object. High-severity heuristics indicate that this Equation Editor object carries a payload-like Ole10Native stream with an anomalous size, strongly suggesting exploitation of a known vulnerability like CVE-2017-11882. This technique is commonly used to deliver a second-stage malicious payload.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/f9QQ6OF.wCDgtsi 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
41d9866be3a025903a67457259ffd98a009854f21017e05e4451154fd8c17345		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/f9QQ6OF.wCDgtsi 945664 bytes
ooxml_oleobject_00_ole10native_00.bin
e01b24279d1ef2433216f5536cff0ced3d57dffec5f2e8a5350020acddc3d7f8		 ole-package OOXML xl/embeddings/f9QQ6OF.wCDgtsi Ole10Native stream: OLe10natIve 935811 bytes

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