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

Static analysis result for SHA-256 e970978abd5b1e11…

MALICIOUS

Office (OLE) / .XLSX

225.2 KB First seen: 2022-10-10
MD5: 1a15384d12547c0fcc4800ddeb9a16f3 SHA-1: 13ef10a94c758f5bd76ebd901f65faaf944c454d SHA-256: e970978abd5b1e11a8bf5b9292bc42fd042a315657226c0fd784b9d3af351d95
220 Risk Score

Malware Insights

MITRE ATT&CK
T1204 Malicious Link T1566 Phishing T1204.002 Malicious File T1566.001 Spearphishing Attachment T1059 Command and Scripting Interpreter

The file is an encrypted XLSX document that contains an Equation Editor OLE object, identified as a carrier for exploit code. The presence of the 'CVE_2018_0798_EQUATION_NATIVE_ANOMALY' heuristic strongly indicates exploitation of this vulnerability. The document's encrypted nature and the exploit carrier suggest it's designed to download and execute a secondary malicious payload upon opening.

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.

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