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

Static analysis result for SHA-256 7205488fe5a1d3d0…

MALICIOUS

Office (OOXML) / .XLSX

716.9 KB Created: 2010-06-04 08:55:28 UTC Authoring application: Microsoft Excel 15.0300 First seen: 2022-09-23
MD5: 26ee50211ff7201897b437362d140af0 SHA-1: c6da3b31af04be390d693742f5b1431603910c79 SHA-256: 7205488fe5a1d3d05f0734af8b156d5c1603e9334b407845eb5545950e7b9acc
140 Risk Score

Malware Insights

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

The sample is an OOXML 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, suggesting it's designed to exploit a vulnerability. The presence of a NOP sled further supports the likelihood of shellcode execution.

Heuristics 4

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/pw0YnpCd.ZrBpQ 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
c01502de6f3366b2efd47cc04fbaf16fc9d03dcd2bace21b7bb9e330dadf7489		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/pw0YnpCd.ZrBpQ 1000960 bytes
ooxml_oleobject_00_ole10native_00.bin
a51f3ae1faaebe9c118ae7b872453900de575e98e168f101d66af1444ee136cc		 ole-package OOXML xl/embeddings/pw0YnpCd.ZrBpQ Ole10Native stream: Ole10NativE 990409 bytes

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