MALICIOUS
180
Risk Score
Malware Insights
MITRE ATT&CK
T1559.001 Component Object Model Hijacking
T1204.002 Malicious File
The sample is an encrypted Office document, indicated by the OFFICE_ENCRYPTED_PACKAGE and OFFICE_DEFAULT_PASSWORD_ENCRYPTED_OOXML heuristics. The OLE_EQUATION_EDITOR and OOXML_ENCRYPTED_EXPLOIT_CARRIER_SHAPE firings suggest that the document is designed to exploit a vulnerability within the Equation Editor OLE object. The OLE_ENCRYPTED_AND_MALFORMED heuristic further indicates a malformed structure, likely a consequence of the exploit. No document body or scripts were extractable due to encryption, but the combination of heuristics strongly points to an exploit carrier.
Heuristics 5
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Equation Editor OLE object high OLE_EQUATION_EDITORDefault-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.
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Encrypted Office package with CFB FAT corruption critical OLE_ENCRYPTED_AND_MALFORMEDEncrypted-package shape co-occurs with FAT-chain corruption — the documented combined evasion form.
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Default-encrypted OOXML exploit carrier layout high OOXML_ENCRYPTED_EXPLOIT_CARRIER_SHAPEDefault-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.
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Office document is password-encrypted medium OFFICE_ENCRYPTED_PACKAGEOLE container holds MS-OFFCRYPTO encrypted package (Standard Encryption (Office 2007, AES)).
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Office OOXML encrypted with default VelvetSweatshop password medium OFFICE_DEFAULT_PASSWORD_ENCRYPTED_OOXMLOLE 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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