Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 6ca7574b11e311e0…

MALICIOUS

Office (OOXML)

759.3 KB Created: 2004-09-16 12:33:58 UTC Authoring application: Microsoft Excel 15.0300 First seen: 2021-06-17
MD5: aa7628e896cac11ce0eb286a9188984c SHA-1: 52d54881c005250d4cdbdbe3a37dc60600494a20 SHA-256: 6ca7574b11e311e0b14d88d87fc11cd1d1cb1a06dea53808ad16d10550e67b04
100 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The file contains an embedded OLE object, specifically identified as a Microsoft Equation Editor object, which is known to be vulnerable. The 'OLE_EQUATION_EDITOR' and 'OLE_EQUATION_OLE10NATIVE_PAYLOAD_ANOMALY' heuristics indicate that this object carries a payload. The document body appears to be a form related to real estate financing, likely a lure to entice the user to open the malicious content.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/Bvpr1QP.OCi contains the Equation Editor CLSID, the legacy component exploited by CVE-2017-11882, CVE-2018-0802, and CVE-2018-0798.
  • 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 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/Bvpr1QP.OCi 990208 bytes
SHA-256: 6ef9ee2ec1e34796440a4634747fd107318110e841f935c9b3998db3bfd6df89
ooxml_oleobject_00_ole10native_00.bin ole-package OOXML xl/embeddings/Bvpr1QP.OCi Ole10Native stream: oLE10NatiVE 979896 bytes
SHA-256: 813b3d7829972a5c482e71e9f8cdb8c2624aa357eadd885cd66313ffb7548d03

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