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

Static analysis result for SHA-256 2dcbbbf553af1a59…

MALICIOUS

Office (OLE) / .XLSX

310.1 KB
MD5: 0c31358e977769af5e167e6828b8565a SHA-1: 948856ff58dbcb77e4ad77f6b9546152073ee679 SHA-256: 2dcbbbf553af1a59ac1beb124df4aeaa7e3dd821db642129c2b6bcab3d38a82f
220 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

This XLSX file is password-encrypted and contains an embedded Equation Editor OLE object, which is a known exploit carrier. The presence of the 'OLE_EQUATION_EDITOR' and 'CVE_2018_0798_EQUATION_NATIVE_ANOMALY' heuristics strongly indicates the exploitation of a vulnerability within the Equation Editor component. The 'OLE_ENCRYPTED_AND_MALFORMED' heuristic further suggests the file is designed to evade detection and deliver a malicious payload, likely through the embedded object.

Heuristics 6

  • 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.
  • Encrypted Office package with CFB FAT corruption critical OLE_ENCRYPTED_AND_MALFORMED
    Encrypted-package shape co-occurs with FAT-chain corruption — the documented combined evasion form.
  • 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.

Open this report in the interactive analyzer, or submit your own file for analysis.