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

Static analysis result for SHA-256 e3effb1493c1acd3…

MALICIOUS

Office (OLE) / .XLSX

49.5 KB First seen: 2022-06-23
MD5: 46374add7f72d8f4dc7c9614eb5e967b SHA-1: 3717ad5754fd014feb639d00b6cb482bbf8b7bf6 SHA-256: e3effb1493c1acd3ba2890069a8bef2d2aed1801b98a71d2095dab80781148d8
262 Risk Score

Malware Insights

MITRE ATT&CK
T1204.002 Malicious File

The file is an encrypted Office document that leverages the CVE-2017-0199 vulnerability. This vulnerability allows the document to act as a remote loader, fetching and executing a payload from the embedded URL 'https://htmlpreview.github.io@url.pm/XZQVw'. The ClamAV detection 'Xls.Downloader.94c25b356b5a6cac-9978798-0' further confirms its malicious downloader nature.

Heuristics 7

  • 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.
  • ClamAV: Xls.Downloader.94c25b356b5a6cac-9978798-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Xls.Downloader.94c25b356b5a6cac-9978798-0
  • 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://htmlpreview.github.io@url.pm/XZQVw

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