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

Static analysis result for SHA-256 f997ef6c62294f34…

MALICIOUS

Office (OOXML) / .XLSX

654.9 KB Created: 2022-08-10 18:51:50 UTC Authoring application: Microsoft Excel 16.0300 First seen: 2024-08-16
MD5: 26b3d97ecf7d461252684667695acaf5 SHA-1: a9d78a5cc2d5d5814e0e9a173ec10590130f6954 SHA-256: f997ef6c62294f34cc756e464a3029ccfd1f91681b2cea14d0bfbf991269dcf1
100 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The sample is an Office document containing an embedded OLE object, specifically identified as an Equation Editor object. High-severity heuristics indicate that this Equation Editor object carries a payload-like Ole10Native stream with an anomalous size and entropy, strongly suggesting it is being used to exploit a vulnerability. The document body appears to be a fabricated invoice or purchase order, likely a lure to trick the user into opening the malicious embedded object.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/8GzRPwl.z9T7Sy 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
872a236bf44c501072575b1cad098f840b00c1e36b5c1eae29c3dce98e0d5b51		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/8GzRPwl.z9T7Sy 894976 bytes
ooxml_oleobject_00_ole10native_00.bin
0cbdbe1dabbfb2ea90186c3a6135217b4de70ac8ca25ef50bfd6144056f6438b		 ole-package OOXML xl/embeddings/8GzRPwl.z9T7Sy Ole10Native stream: Ole10NAtIve 885332 bytes

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