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

Static analysis result for SHA-256 088d96e8046ad96c…

MALICIOUS

Office (OLE) / .XLSX

368.5 KB First seen: 2022-04-22
MD5: adfa2d703fe1a061bb4ad1a36e7dadc3 SHA-1: 7d73cb82cc7425723507d1bc800008162b66ddba SHA-256: 088d96e8046ad96c772018986366ec2454495bf83b169465b2e323f21672da3f
142 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The sample is a password-protected OOXML file that exploits CVE-2017-0199 via an embedded OLE object. This exploit is known to act as a remote loader, downloading and executing a second-stage payload from a specified URL. The embedded URL points to `https://www.bot.ax/tvgqH`, which is highly suspicious.

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 https://www.bot.ax/tvgqH

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