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

Static analysis result for SHA-256 f9541983f2c2e2f0…

MALICIOUS

Office (OLE) / .XLS

1.24 MB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel
MD5: f63c009bccbc4d8d26d162a168feaeb1 SHA-1: fa8ab13582703932f968a31e6cc0973e45ca43e0 SHA-256: f9541983f2c2e2f0a0a72dce180342d0637a52a4ba6e49ea42e8c5844d4de9e3
68 Risk Score

Malware Insights

MITRE ATT&CK
T1204.002 Malicious File T1059.005 Visual Basic

The sample is an Excel file that exploits CVE-2017-0199, a known vulnerability for remote code execution. The heuristic firing indicates it uses an OLE2Link object to fetch a remote resource from 'http://tny.wtf/sA'. Although no VBA code was found to be executable, the exploit itself is sufficient to download and execute a second-stage payload. The document body is heavily corrupted and unreadable, providing no further context.

Heuristics 2

  • 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.

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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