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

Static analysis result for SHA-256 cac756d7c485d1f5…

MALICIOUS

Office (OLE) / .XLSX

28.5 KB First seen: 2022-10-17
MD5: 8d877ff1cd4a114f8c336fa812b9252e SHA-1: e0eac01c358a1485e7502efe8744a844b58ec07d SHA-256: cac756d7c485d1f59f9d48a89fa15c62e78e6ad127ad6bdef3b35afa8c74c7f3
142 Risk Score

Malware Insights

MITRE ATT&CK
T1204.002 Malicious File: User Execution T1566.002 Phishing: Spearphishing Attachment

The critical heuristic firing for CVE-2017-0199 indicates that this OOXML file is designed to exploit a vulnerability in Microsoft Office. It attempts to download a secondary payload from the URL http://officeupdated_sucecssfully@192.210.160.112/uijjjhiihieiiiwieihhuasduyuASHUDHUSADHUASDU/jooojhhuhhasdwwwasdsdssdw.doc. The document is password-encrypted, a common tactic to evade static analysis and hide 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)).
  • 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://officeupdated_sucecssfully@192.210.160.112/uijjjhiihieiiiwieihhuasduyuASHUDHUSADHUASDU/jooojhhuhhasdwwwasdsdssdw.doc

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