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

Static analysis result for SHA-256 d666e05c7c0e1000…

MALICIOUS

Office (OLE) / .XLSX

343.5 KB First seen: 2022-04-14
MD5: 7222a70df9c6bd0a47dcc10d9ea1fbe4 SHA-1: ff11ec5ce0eaf2555aea8154c4be67549ab60e37 SHA-256: d666e05c7c0e1000fe8af9502b2a45a10f7556dc11eb0dbbe7d95616ab94fd30
160 Risk Score

Malware Insights

MITRE ATT&CK
T1204 Malicious Link T1204.001 Malicious Link: Malicious Link T1559 Component Object Model Hijacking T1559.001 Component Object Model Hijacking: Component Object Model Hijacking T1059 Command and Scripting Interpreter T1059.003 Command and Scripting Interpreter: Windows Command Shell

The file is an encrypted Office document containing an Equation Editor OLE object. High-severity heuristics indicate this object is anomalous and exploits CVE-2018-0798, a vulnerability in Microsoft Equation Editor. This suggests the document is designed to leverage this exploit to execute a malicious payload. No scripts were extracted, and the document body is encrypted, limiting further analysis of the specific payload.

Heuristics 5

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Default-encrypted OOXML 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
    Default-encrypted OOXML contains embedded Equation Editor data with anomalous native stream bytes consistent with a CVE-2018-0798-style exploit. This is treated as likely CVE evidence because the Equation object is malformed and payload-like.
  • Default-encrypted OOXML exploit carrier layout high OOXML_ENCRYPTED_EXPLOIT_CARRIER_SHAPE
    Default-password encrypted OOXML package contains embedded OLE object parts and additional activation/decoy parts. This layout is common in malicious Excel exploit delivery and requires inspecting the decrypted package.
  • Office document is password-encrypted medium OFFICE_ENCRYPTED_PACKAGE
    OLE container holds MS-OFFCRYPTO encrypted package (Standard Encryption (Office 2007, AES)).
  • Office OOXML encrypted with default VelvetSweatshop password medium OFFICE_DEFAULT_PASSWORD_ENCRYPTED_OOXML
    OLE EncryptedPackage decrypts with Excel's built-in VelvetSweatshop password. Office opens this transparently, and malware uses it to hide OOXML exploit parts from scanners that only inspect the outer OLE container.

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