MALICIOUS
160
Risk Score
Malware Insights
MITRE ATT&CK
T1203 Exploitation for Client Execution
T1566.001 Phishing: Spearphishing Attachment
T1059 Command and Scripting Interpreter
The sample is a default-encrypted OOXML file containing an Equation Editor OLE object, which is a high-signal indicator of exploits targeting CVE-2017-11882 or similar vulnerabilities. ClamAV's detection as a downloader is a result of thes specific exploit delivery mechanism. No scripts were extracted from this sample, but the exploit's intent is to execute arbitrary code via the OLE object.
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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ClamAV: Xls.Downloader.af2fa5c5d0587870-9978799-0 critical CLAMAV_DETECTIONClamAV detected this file as malware: Xls.Downloader.af2fa5c5d0587870-9978799-0
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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 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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