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

Static analysis result for SHA-256 6b739d3c1600ee9c…

MALICIOUS

Office (OOXML) / .XLSX

654.9 KB Created: 2023-07-26 19:45:53 UTC Authoring application: Microsoft Excel 12.0000 First seen: 2023-09-13
MD5: c49fb39ca1617da6a1b582ccef65e888 SHA-1: 98b0a566c1db9c8437e9c5f71c551ae2f6b21853 SHA-256: 6b739d3c1600ee9c73c0c082d0b520c9708ea6194a556ed26ad6f87dd94bd23a
140 Risk Score

Malware Insights

MITRE ATT&CK
T1559.001 Component Object Model Hijacking T1204.002 Malicious File

The file is an Excel spreadsheet containing an embedded OLE object, specifically identified as a vulnerable Equation Editor component. This component is known to be exploited to execute arbitrary code, likely delivering a second-stage payload. The presence of a NOP sled further indicates shellcode execution.

Heuristics 4

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/xtWWL2P9m.Bo 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
ce71edd0db59c8f7f8052443823d4dc8345625d1a2df8ebfbec313c58fd25900		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/xtWWL2P9m.Bo 920576 bytes
ooxml_oleobject_00_ole10native_00.bin
0cca4ccb9f64683da74698aaff755306aedb57ed6bffef7683548d2aa4422800		 ole-package OOXML xl/embeddings/xtWWL2P9m.Bo Ole10Native stream: OLE10NAtIvE 910661 bytes

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