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

Static analysis result for SHA-256 15ae7972399e45f0…

MALICIOUS

Office (OOXML) / .XLSX

15.4 KB Created: 2023-03-13 06:58:13 UTC Authoring application: Microsoft Excel 12.0000 First seen: 2023-04-05
MD5: 1edf61e6e80cbd4ca48cd6b3c138192e SHA-1: 69be77bc6cff0bfb2f0aad3bfce775d9885e93a1 SHA-256: 15ae7972399e45f01e8bdebf6a50021cf9c10a1e7d310a26fc6eb4001f8b2dd2
100 Risk Score

Malware Insights

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

The file is an OOXML document containing an embedded OLE object, specifically an Equation Editor object. Heuristics indicate this object is anomalous and exploits CVE-2018-0798. The document body presents a plausible-looking order form, suggesting a social engineering lure to trick the user into interacting with the embedded malicious object.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/oleObject1.bin contains the Equation Editor CLSID, the legacy component exploited by CVE-2017-11882, CVE-2018-0802, and CVE-2018-0798.
  • CVE-2018-0798 — anomalous Equation Editor native stream high CVE likely CVE_2018_0798_EQUATION_NATIVE_ANOMALY
    Embedded Equation Editor OLE data contains anomalous native stream bytes consistent with a CVE-2018-0798-style Equation Editor exploit. This is treated as likely CVE evidence because the Equation object is malformed and payload-like, but it does not match the exact public matrix-overflow byte signature.
  • 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
a58757b9bd913d9f92b699e29b434dba2ab8a8aa65b9c983d8d5c85ff1a17b64		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/oleObject1.bin 4608 bytes
ooxml_oleobject_00_ole10native_00.bin
de7f219219fc0955c1488f81905f8bd5eb1e0b5b2dee1c2a64e17b8108cf4e9f		 ole-package OOXML xl/embeddings/oleObject1.bin Ole10Native stream: olE10natIVE 2308 bytes

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