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

Static analysis result for SHA-256 323b5378ce4ca793…

MALICIOUS

Office (OOXML) / .XLSX

686.6 KB Created: 2023-07-26 19:45:53 UTC Authoring application: Microsoft Excel 12.0000 First seen: 2023-08-15
MD5: edefeb7b415f825eea5d631f8c84e59e SHA-1: 080c46d60404dc70d3c08268ce26099b7f453eb7 SHA-256: 323b5378ce4ca793cebf61e42b0cdafe14256bad9ff2a4d64e5daaa8991d886b
140 Risk Score

Malware Insights

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

The XLSX file contains an embedded OLE object, specifically identified as a vulnerable Equation Editor object. This object carries a payload-like Ole10Native stream, indicating it's designed to exploit a known vulnerability. The presence of a NOP sled further suggests shellcode execution.

Heuristics 4

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/nbyd.XWA 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
57c6b364ed082344ab5e6f50a06bebbc0c1c263493a22a089a7fc7a66194eca3		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/nbyd.XWA 968192 bytes
ooxml_oleobject_00_ole10native_00.bin
238f6f8eda3a42558dc39d5ffa510ace118698c2410af838497aa78da7c42b99		 ole-package OOXML xl/embeddings/nbyd.XWA Ole10Native stream: Ole10nAtiVE 958197 bytes

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