Xls.Downloader.b83ac4c497e169b5-9980307-0 — Office (OLE) / .XLS malware analysis

Static analysis result for SHA-256 a1e691727f9801bd…

MALICIOUS

Office (OLE) / .XLS

55.5 KB Created: 2022-11-29 07:16:03 Authoring application: Microsoft Excel First seen: 2022-11-30
MD5: 39d74b247e6d3f1cbfb8806edf65a067 SHA-1: caf17ac901e7ff8ed05cd07f74d3ef418ac943f0 SHA-256: a1e691727f9801bd400d7100b0706799c5282dccd78b1aacf5e3389d4e4c1c4a
188 Risk Score

Malware Insights

Xls.Downloader.b83ac4c497e169b5-9980307-0 · confidence 95%

MITRE ATT&CK
T1059.005 Visual Basic T1105 Ingress Tool Transfer T1059 Command and Scripting Interpreter

The file contains VBA macros that utilize CreateObject("MSXML2.XMLHTTP") to download content from a URL. The Shell() call within the VBA code indicates that the downloaded content is likely executed as a second-stage payload. This behavior is consistent with a downloader malware.

Heuristics 5

  • Shell() call in VBA critical OLE_VBA_SHELL
    Shell() call in VBA
  • ClamAV: Xls.Downloader.b83ac4c497e169b5-9980307-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Xls.Downloader.b83ac4c497e169b5-9980307-0
  • CreateObject call high OLE_VBA_CREATEOBJ
    CreateObject call
  • VBA macros detected medium OLE_VBA_MACROS
    Document contains VBA macro code
  • Environ() call (env variable access) low OLE_VBA_ENVIRON
    Environ() call (env variable access)

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
7aa807d266e0fbfc057565ac72ebadfaaae7c974f83a8f70f0e053cfba7655ac		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 5075 bytes

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