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

Static analysis result for SHA-256 6bcaa06dd53ee4d8…

MALICIOUS

Office (OOXML) / .XLSX

700.4 KB Created: 2023-07-26 19:45:53 UTC Authoring application: Microsoft Excel 12.0000 First seen: 2023-10-11
MD5: 5f0a41100dd08ddbf58e1a314991f84e SHA-1: 83df097fff63f0b84eb609c1a50bd5b69947e839 SHA-256: 6bcaa06dd53ee4d8fe107f6e4ac613b687c63bf521b7534a195dccbb39383654
100 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.001 Malicious Link

The file is an Excel spreadsheet containing an embedded OLE object, specifically identified as a 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 exploitation of a known vulnerability like CVE-2017-11882. This technique is commonly used to download and execute a second-stage payload.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/FYddMgCL.gm8b 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
722cf2bdb223bcdbfcac4cfca5d0e25172e84b30c9020682c141c8d4d2109748		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/FYddMgCL.gm8b 970240 bytes
ooxml_oleobject_00_ole10native_00.bin
d719ae04beb4caae4e43c8d8642b4e1fe5ca572a05efc1ff8cbdfe85e70a3ce1		 ole-package OOXML xl/embeddings/FYddMgCL.gm8b Ole10Native stream: Ole10nAtIVE 960116 bytes

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