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

Static analysis result for SHA-256 7b8cfe8bf97bf6df…

MALICIOUS

Office (OOXML) / .XLSX

599.8 KB Created: 2023-07-26 19:45:53 UTC Authoring application: Microsoft Excel 12.0000 First seen: 2023-08-17
MD5: 2c4a72cbb83b315070b0a2045bf1e919 SHA-1: 5d5ee3c829abde017156ac6045d415d6faec5d7a SHA-256: 7b8cfe8bf97bf6dfa0d5a92ed51cf9fdc50ab6cb5b34a44c96567da52c138431
140 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious File

The XLSX file contains 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 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.

Heuristics 4

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/rG.HuaI 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
8ab862297d135aad4a5efd496b7b7236693138a7e162cdaf5ea26a83ff64f0fd		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/rG.HuaI 860672 bytes
ooxml_oleobject_00_ole10native_00.bin
aca2ad315437b815e5f86eca472974b68bfe2ddf03b9b766fb1087876146a6c8		 ole-package OOXML xl/embeddings/rG.HuaI Ole10Native stream: Ole10NatiVe 851247 bytes

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