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

Static analysis result for SHA-256 8be7de7be4d576cb…

MALICIOUS

Office (OOXML) / .XLSX

730.4 KB Created: 2023-07-26 19:45:53 UTC Authoring application: Microsoft Excel 12.0000 First seen: 2023-08-31
MD5: c31928dd1a31808c3dfacb00b6bcbf76 SHA-1: eb9439771718d0c6d739e0e0b39cda30bfadcc1c SHA-256: 8be7de7be4d576cb3229283f4e33d8a33f4b394c20436632b71b6e05c1092afd
140 Risk Score

Malware Insights

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

The XLSX file contains an embedded OLE object, specifically identified as a Equation Editor object. This object exhibits anomalies in its Ole10Native stream, suggesting it carries a malicious payload. The presence of a NOP sled further indicates an attempt to exploit a vulnerability, likely related to the Equation Editor, to execute arbitrary code.

Heuristics 4

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/uipYAFhsZ.DnoiW 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
52b9db98ea0fc347ef366298eb8b33d9b3cbf212f3d1c0fe830ecf70d08fcf9a		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/uipYAFhsZ.DnoiW 1037312 bytes
ooxml_oleobject_00_ole10native_00.bin
661a2e77b106580e8aed4b7b7adc3c7f2db64ecb214f7c28daa2cd221180fc00		 ole-package OOXML xl/embeddings/uipYAFhsZ.DnoiW Ole10Native stream: olE10nAtIve 1026780 bytes

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