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

Static analysis result for SHA-256 03d0c8538fc5607e…

MALICIOUS

Office (OLE) / .XLSX

84.0 KB First seen: 2022-08-25
MD5: 5728e0b2c74acc27fc3beeddd3a965a1 SHA-1: 6e2e78e3633026904d4bf87c41cd0b56d0a411d4 SHA-256: 03d0c8538fc5607e924a1c2e0e2cc8404a7357d9af0c18b4bd4425df1a654f91
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 file is an encrypted OOXML document that exploits CVE-2017-0199. This vulnerability allows the document to act as a remote loader, fetching and executing a payload from the embedded URL http://www.mygreatlearning.com@192.3.108.11/nmv/https_l/www.doc. The encryption and exploit carrier shape heuristics further indicate its malicious intent as a delivery 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-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://www.mygreatlearning.com@192.3.108.11/nmv/https_l/www.doc