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

Static analysis result for SHA-256 491b890f6733ed88…

MALICIOUS

Office (OLE) / .XLSX

20.4 KB First seen: 2022-03-18
MD5: a0402dd215fd55251d8f0e7f3d1b69ef SHA-1: 8c55e1a8c0ddb3c3909ce6ef3b069d0685b88210 SHA-256: 491b890f6733ed8864a08b904042deec27fc4eefcda3543ed93994eabd81ee24
202 Risk Score

Malware Insights

MITRE ATT&CK
T1204.002 Malicious File T1059.001 PowerShell

This XLSX file is password-encrypted and contains an embedded OLE object (xl/embeddings/oleObject1.bin) that exploits CVE-2017-0199. This vulnerability allows the document to act as a remote loader, fetching and executing a payload from the URL https://2l.lv/17. The exploitation of this vulnerability is the primary mechanism for delivering a secondary stage.

Heuristics 6

  • OLE2Link / URL Moniker → remote loader — CVE-2017-0199 critical CVE likely CVE_2017_0199
    Document contains an embedded OLE link object whose URL Moniker points to a remote URL. When the host file is opened, Office follows the link, downloads the URL, and processes the response based on its Content-Type (HTA -> mshta.exe, RTF → Word, etc.) — the documented CVE-2017-0199 primitive. The URL extension is not a reliable filter; servers can return different payloads to Office's user agent.
  • 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.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://2l.lv/17

Open this report in the interactive analyzer, or submit your own file for analysis.