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

Static analysis result for SHA-256 b9749fc7029a2176…

MALICIOUS

Office (OLE) / .XLSX

973.5 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel
MD5: 6689e349c713a87c92613d78c7a4958b SHA-1: 693b5e1d3ed45df81c57cc1c2bdb22473fee869e SHA-256: b9749fc7029a2176e35e836964dc9b12c5215ac0015c09abf496754126e462e9
128 Risk Score

Malware Insights

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

The critical heuristic firing for CVE-2017-0199 indicates that the file is designed to exploit this vulnerability to download and execute a remote payload. The extracted URL is the primary indicator of the malicious payload's source. Although VBA macros were detected, they contained no executable statements, suggesting the exploit is likely delivered through the OLE object itself.

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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