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

Static analysis result for SHA-256 42c6f01e2be38da4…

MALICIOUS

Office (OOXML) / .XLSX

627.4 KB Created: 2023-07-26 19:45:53 UTC Authoring application: Microsoft Excel 12.0000 First seen: 2023-08-09
MD5: 592effda30057f1f23b21af692849edb SHA-1: 3855600c52993176de7a06e0856eb912696f0b9d SHA-256: 42c6f01e2be38da4c04082fe2014c5ee38742189c8ba57222b2e7b3a6bd45fcc
100 Risk Score

Malware Insights

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

The file is an Excel spreadsheet containing an embedded OLE object, specifically identified as a vulnerable Equation Editor object. This object carries a payload-like Ole10Native stream with an anomalous header, indicating it's designed to exploit a known vulnerability. The presence of this object strongly suggests the file is a malicious document intended to exploit the Equation Editor vulnerability upon opening.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/2kFmDJ.nPBhc 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
270f634e60707652549a67cf8a95e80c2465d6cf3501dc930e7c0ef528ef3df6		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/2kFmDJ.nPBhc 916480 bytes
ooxml_oleobject_00_ole10native_00.bin
5e56e06f299ed5ddc20fda710bcad808c7a4b63bf0974e6fc95db19020dbe987		 ole-package OOXML xl/embeddings/2kFmDJ.nPBhc Ole10Native stream: Ole10nATiVe 907263 bytes

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