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

Static analysis result for SHA-256 f600921837f1dcb4…

MALICIOUS

Office (OLE) / .XLSX

43.5 KB First seen: 2022-08-09
MD5: 995f697e518553ab910f1a2a329fde46 SHA-1: ed571628df1ffe45d10a14f593b4a595aef10773 SHA-256: f600921837f1dcb4cbf6e41a051fc807c695e74a7b4c5e3efced460788ed2256
142 Risk Score

Malware Insights

MITRE ATT&CK
T1204.002 Malicious File T1566.001 Spearphishing Attachment

The file is a password-encrypted Office document, a common technique to hide malicious content. It exploits CVE-2017-0199, which allows for remote code execution by leveraging OLE object linking and embedding. The embedded URL `http://jmcglone.com@aws3.link/RCcsOj` is likely used to download and execute a second-stage payload.

Heuristics 5

  • 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.
  • 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 http://jmcglone.com@aws3.link/RCcsOj

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