MALICIOUS
140
Risk Score
Malware Insights
MITRE ATT&CK
T1204 Malicious Link
T1566 Phishing
T1059 Command and Scripting Interpreter
The sample is an encrypted Office XLSX file. High severity heuristics indicate the presence of an Equation Editor OLE object (OLE_EQUATION_EDITOR) which is known to be used as an exploit carrier. The OLE_EQUATION_OLE10NATIVE_PAYLOAD_ANOMALY heuristic suggests this object contains a payload. The OOXML_ENCRYPTED_EXPLOIT_CARRIER_SHAPE heuristic further confirms the exploit carrier nature of the document. The default password encryption (OFFICE_DEFAULT_PASSWORD_ENCRYPTED_OOXML) is a common tactic to evade initial static analysis.
Heuristics 4
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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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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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Equation Editor object carries payload-like Ole10Native stream high OLE_EQUATION_OLE10NATIVE_PAYLOAD_ANOMALYDefault-encrypted OOXML embedded OLE object declares the Equation Editor CLSID but stores a large high-entropy Ole10Native stream with malformed package sizing. This is exploit-shaped Equation/OLE payload evidence.
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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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