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

Static analysis result for SHA-256 c4e7324e3a43bc13…

MALICIOUS

Office (OOXML) / .XLSX

696.8 KB Created: 2022-08-10 18:51:50 UTC Authoring application: Microsoft Excel 16.0300 First seen: 2023-09-15
MD5: a1826819dacef6492ef38ec6f74853d5 SHA-1: 9b4b4ce5aa153027ff1f3e5ede76c247918d1fab SHA-256: c4e7324e3a43bc134e3b0eafd28c8a4fa6491981c5851b3cb20bea77371429f8
140 Risk Score

Malware Insights

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

The sample is an Excel file containing an embedded OLE object, specifically identified as a Equation Editor object. Heuristics indicate this object carries a payload-like Ole10Native stream with an anomalous header, suggesting it's designed to exploit a vulnerability. The presence of a NOP sled further supports the exploitation of a memory corruption vulnerability, commonly associated with Equation Editor exploits.

Heuristics 4

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/xGh2yUNAM.Amq 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
1c6ebde0cfae2f644e751b63aaee4ed5d89f55dc4bffb3a204fda76261fd0214		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/xGh2yUNAM.Amq 983040 bytes
ooxml_oleobject_00_ole10native_00.bin
82542ccddce99782f8a353f19296b2823e364e7f6bb4d0e6a6bc1840d51d78a8		 ole-package OOXML xl/embeddings/xGh2yUNAM.Amq Ole10Native stream: oLE10NaTivE 973016 bytes

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