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

Static analysis result for SHA-256 d787f0dc0cd1da4c…

MALICIOUS

Office (OOXML) / .XLSX

641.5 KB Created: 2023-08-03 11:34:29 UTC Authoring application: Microsoft Excel 16.0300 First seen: 2023-09-20
MD5: 1db728298b71d0766b6e7cdde9f2dac7 SHA-1: cb06b42bbacf271840f8aa84bbaf74588a23cf2d SHA-256: d787f0dc0cd1da4c6da20750aea9ef4533e3669787671e4648b4b7b08c719715
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 an Equation Editor object. This object is associated with a high-severity heuristic firing indicating a potential exploit. The presence of a NOP sled further suggests shellcode execution. These indicators strongly suggest the file is designed to exploit the Equation Editor vulnerability (CVE-2017-11882) to achieve arbitrary code execution, likely for downloading and running a secondary payload.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/V0a.u3rIQz 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
  • 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
0005934302f945e445f340d4afb545050baf2927f8eb67625ae9c9a6a89c5c73		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/V0a.u3rIQz 911872 bytes
ooxml_oleobject_00_ole10native_00.bin
93390452a6bf8f9ff44b82ef680c22ed117721f409baaa7d55124cbf84f6644e		 ole-package OOXML xl/embeddings/V0a.u3rIQz Ole10Native stream: OLe10NATiVE 902603 bytes

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