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

Static analysis result for SHA-256 75325730073da4f6…

MALICIOUS

Office (OLE) / .XLSX

35.0 KB First seen: 2022-08-17
MD5: 31f7c438665f3d9162b95af7c7e045b7 SHA-1: c1a25ca367c67479bd55c54ed0c5872b607a9f03 SHA-256: 75325730073da4f6c32ef2cc9121efd3374e0b631ffabc1282cddd1df63778fb
142 Risk Score

Malware Insights

MITRE ATT&CK
T1204 Malicious Link T1204.001 Malicious Link: Malicious Link T1059 Command and Scripting Interpreter T1059.001 Command and Scripting Interpreter: PowerShell T1190 Exploit Public-Facing Application

The file is an encrypted Office document that exploits CVE-2017-0199, a known vulnerability for remote code execution. The exploit carrier is an embedded OLE object that contains a URL Moniker pointing to 'http://trim.cfd/-d/veZHIMfS', which is likely used to download and execute a second-stage payload. The document itself is password-encrypted, preventing static analysis of its content.

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://trim.cfd/-d/veZHIMfS

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