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

Static analysis result for SHA-256 1df05447429b047c…

MALICIOUS

Office (OLE) / .XLS

71.0 KB Created: 2022-11-29 07:16:03 First seen: 2022-12-02
MD5: 6e125420d5b7df4ecdee0a69da5a9430 SHA-1: 6b8c7afb46d77366915d4548e3a73ed9c7764b75 SHA-256: 1df05447429b047c401480a299bdabc832615f6c19bcd0dd5be8ae796062c9af
188 Risk Score

Malware Insights

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

MITRE ATT&CK
T1059.005 Visual Basic T1059.001 PowerShell T1105 Ingress Tool Transfer

The file is detected as malicious by ClamAV with the signature Xls.Downloader.b83ac4c497e169b5-9980307-0. Critical heuristics indicate the presence of VBA macros that utilize Shell() and CreateObject() functions, strongly suggesting the execution of arbitrary code. The VBA script attempts to download content from a URL using MSXML2.XMLHTTP, which is then likely processed or executed as a second-stage payload.

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
ea9aa5786435bec4eb395abb65c6116c3ff1fbdb76bac19e19b704997c425094		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 5077 bytes

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