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

Static analysis result for SHA-256 90732429e1c9ff8e…

MALICIOUS

Office (OLE) / .XLS

973.5 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel
MD5: dbf9f3969c4ba47d06de2e8679775344 SHA-1: 29560503e3bc9e2ff83acd1f4ec3273c9f2627ea SHA-256: 90732429e1c9ff8e905c30cf966bcde291159eb8ff4939614219ce1b75c3da17
128 Risk Score

Malware Insights

MITRE ATT&CK
T1204.002 Malicious File Execution: User Execution of Malicious File T1059.005 Command and Scripting Interpreter: Visual Basic

The critical heuristic firing for CVE_2017_0199 indicates exploitation of a known vulnerability in OLE2Link to download a remote payload. The extracted URL points to a suspicious domain, likely serving the second-stage malware. Although VBA macros were detected, they contained no executable statements, suggesting the exploit is leveraged directly through the OLE object rather than macro execution.

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
382fc1344a2f0cf6eda18645d41def8d571debc6637bc7fe02a5c83715a51bef		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 2112 bytes

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