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

Static analysis result for SHA-256 aa207b7d5be6d970…

MALICIOUS

Office (OOXML) / .XLSX

664.0 KB Created: 2010-06-04 08:55:28 UTC Authoring application: Microsoft Excel 15.0300 First seen: 2023-10-26
MD5: f368721b6608296f712a848fd9b12feb SHA-1: 6d4fc4eabf6f2385eeecc2f56d9b441eded484e5 SHA-256: aa207b7d5be6d9709f7dca6aab3e191c13441828ae57288250e5ffcb9b5d679f
140 Risk Score

Malware Insights

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

The file is an OOXML document containing an embedded OLE object, specifically identified as a Microsoft Equation Editor object. High-severity heuristics indicate that this Equation Editor object carries a payload-like Ole10Native stream, suggesting exploitation of a vulnerability within the editor. The document body contains text resembling an invoice for food products, likely serving as a lure to trick the user into opening the malicious content.

Heuristics 4

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/3J.p41o 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
ebb9028c37bdeb0268ec857e2b2161262b9fbaaf2c0c206ddb2c240523da31b5		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/3J.p41o 910336 bytes
ooxml_oleobject_00_ole10native_00.bin
1adbfd5ede1a565d0fd3becf8c2205b7d1b050f04ac9c848b849df1e1faeeda5		 ole-package OOXML xl/embeddings/3J.p41o Ole10Native stream: oLe10NatIvE 900630 bytes

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