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

Static analysis result for SHA-256 f0ea2cf9f728ecbf…

MALICIOUS

Office (OLE) / .XLSX

47.5 KB First seen: 2022-08-26
MD5: 3906e38dc498132521c235daab460fe6 SHA-1: 26ddfa07ee76d1fcea6312de13d0375530e2cbc7 SHA-256: f0ea2cf9f728ecbfea0f4f52973fc44cc166674df0603603e5dbfd90a8ed0d34
142 Risk Score

Malware Insights

MITRE ATT&CK
T1204.002 Malicious File T1059.001 PowerShell T1071.001 Web Protocols

The sample is an encrypted Office document that exploits CVE-2017-0199. It contains an embedded URL that likely serves as a lure to download a second-stage malicious document. The exploit carrier is an OLE object within the OOXML structure, indicating a remote loading mechanism.

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://www.mygreatlearning.com@172.245.214.173/office/https_b.doc

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