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

Static analysis result for SHA-256 f419ed66e0e8c15d…

MALICIOUS

Office (OLE) / .XLSX

41.5 KB First seen: 2022-08-29
MD5: aa97f8033c6d534d1adeeb06da1b4d60 SHA-1: 0619ce667d01485eae586a920fc15a4ccee244bd SHA-256: f419ed66e0e8c15dd75f99b3cacabe4cb5f272bc33fb0ed6c2a4a12a40888051
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

The sample is a password-encrypted OOXML document that exploits CVE-2017-0199. It contains an embedded URL that likely serves as a loader for a remote document. The exploitation of CVE-2017-0199 indicates an attempt 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://username@107.175.3.10/..-----------..-------------..------------..------------..-----------_----_-/75.doc

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