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

Static analysis result for SHA-256 7410fb63e04cc473…

MALICIOUS

Office (OLE) / .XLSX

237.0 KB First seen: 2022-07-13
MD5: e8ee2a59495381519af2f08b9d333da3 SHA-1: 86983c2e9869a41b6cc0b48e5e1b6f1c0dacdc3c SHA-256: 7410fb63e04cc473c63a767b00e9c11a490a87580385b9c72a9597e51cc27b0e
160 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The file is an encrypted Office document containing OLE objects, specifically identified as an Equation Editor exploit carrier. The presence of the CVE-2018-0798 anomaly strongly suggests exploitation of a vulnerability within the Equation Editor component to achieve arbitrary code execution. The document's encrypted nature and the exploit carrier layout are typical of malicious documents delivered via spearphishing attachments.

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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