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

Static analysis result for SHA-256 250eb63c874a5823…

MALICIOUS

Office (OLE) / .XLSX

49.5 KB First seen: 2022-09-07
MD5: 20c49cd4124b88b63a4fc470721b8761 SHA-1: 7648e88f084d1de55246424a5d8c4f2d59c6c5a8 SHA-256: 250eb63c874a58237aa4eae1f57290fd4b02ca85e1e4a46ce96ade4551f03827
142 Risk Score

Malware Insights

MITRE ATT&CK
T1204.002 Malicious File T1059.001 PowerShell T1059.003 Windows Command Shell

The sample is an OOXML exploit carrier, specifically leveraging CVE-2017-0199. It contains an embedded URL pointing to a remote document, which is likely a second-stage payload. The document is password-encrypted, a common tactic to obscure malicious 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-128)).
  • 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://172.245.142.61/..----...................-----------------_----__-----_--------___-------/220.doc

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