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

Static analysis result for SHA-256 70339a30961fa104…

MALICIOUS

Office (OLE) / .XLS

1.09 MB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel
MD5: 966fccc681e672b6dbed8d0bab708034 SHA-1: bf29b6feff16bfb287c648b267df578da16f3904 SHA-256: 70339a30961fa1042bb36ac6f52402d5a84fc6f7f857a0ec4f6f7d7c482374bf
70 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

The sample leverages the OLE2Link vulnerability (CVE-2017-0199) to fetch and execute a secondary payload from a remote URL. The VBA project itself contains no executable statements, but the exploit mechanism is clearly indicated by the heuristic firing. The embedded URL is the primary indicator for the next stage of the attack.

Heuristics 3

  • 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.
  • VBA project contains no executable statements low OLE_VBA_MACROS
    Document contains a VBA project, but extracted modules only contain attributes/options/comments and no executable statements.
  • 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://opn.my/pt0W9n?&easel=finicky&terracotta=gaping&paleontology=condemned&trinket

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
7f506327609c082af1cd37dde23bc2c71a000f7d1ef530b6abb66775040a7673		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 1206 bytes

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