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

Static analysis result for SHA-256 559122ff10dc062b…

MALICIOUS

Office (OLE) / .XLS

448.5 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel
MD5: 93728a4082d57c877a1d0ece7c233e42 SHA-1: d549cf4aa78a533c6f1426a69ee20b6e2f835f10 SHA-256: 559122ff10dc062b44d239d7867a47266f0b8b1088df6551dcfa0f75eb1014bb
128 Risk Score

Malware Insights

MITRE ATT&CK
T1204.002 Malicious File: User Execution T1059.005 PowerShell T1566.001 Phishing: Spearphishing Attachment T1059.001 PowerShell T1059.003 Windows Command Shell

The sample is an XLS file that exploits CVE-2017-0199 via an OLE2Link object to download a remote payload from the URL http://hop.fyi/NlD6e. Although the VBA macros themselves contain no executable statements, the critical heuristic firing indicates the exploit is present and functional. This suggests the file's primary purpose is to act as a downloader for further malicious activity.

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.
  • ClamAV: Xls.Downloader.Trojan-aa0b8f388d8573cd-aa0b8f388d8573cd-9950439-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Xls.Downloader.Trojan-aa0b8f388d8573cd-aa0b8f388d8573cd-9950439-0
  • 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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