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

Static analysis result for SHA-256 c554b0418500c365…

MALICIOUS

Office (OOXML) / .XLSX

626.3 KB Created: 2023-07-26 19:45:53 UTC Authoring application: Microsoft Excel 12.0000 First seen: 2023-09-07
MD5: c8826acdd501ef48ed35c5a03b142050 SHA-1: 5ea272632c983e7dc3bc01f449549f0b8bb40857 SHA-256: c554b0418500c3655e3ebf9fc7626fbbc146d0d7fee74093c97e05c0ebda16dd
100 Risk Score

Malware Insights

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

The file contains an embedded OLE object, specifically identified as a Equation Editor object, which is known to be a vector for exploiting vulnerabilities. The OLE10Native stream within this object exhibits an anomaly in its size, strongly suggesting it carries a malicious payload. This indicates the file is designed to exploit the Equation Editor vulnerability to execute arbitrary code.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/DgICBK1.LPLjwOE 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
0b56b3099c2cd20deda60c336002cbb4b2d4cc6144058eb4de3b95c31b2dbf40		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/DgICBK1.LPLjwOE 943104 bytes
ooxml_oleobject_00_ole10native_00.bin
90fc6e6281a51714ef2a704c4a9cef30c853a33394f669a3687788cb200a4627		 ole-package OOXML xl/embeddings/DgICBK1.LPLjwOE Ole10Native stream: OLE10natiVE 932930 bytes

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