Malicious Office (OOXML) / .XLSM — malware analysis report

Static analysis result for SHA-256 0dadfae2afbe2e8f…

MALICIOUS

Office (OOXML) / .XLSM

102.2 KB Created: 2021-08-19 14:03:52 UTC Authoring application: Microsoft Excel 15.0300
MD5: 325dfc8b7aa09fd04bd035025ddb17b6 SHA-1: c41d2e7486140ee400e35b563d6eab9ea3b2799f SHA-256: 0dadfae2afbe2e8f524f23b3231828c5594c51b3e8682e06d613008b8d4b1402
342 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1059.003 Windows Command Shell T1204.002 Malicious File T1105 Ingress Tool Transfer

The sample is an XLSM file containing a Workbook_Open VBA macro. This macro executes a command using cmd.exe to download a batch script from the URL "http://18.159.59.253/cut/290091332850986.bat" using certutil and then executes the downloaded script. This indicates a downloader or dropper functionality.

Heuristics 8

  • Shell() call in VBA critical OLE_VBA_SHELL
    Shell() call in VBA
  • LOLBin reference in VBA critical OLE_VBA_LOLBIN
    LOLBin reference in VBA
  • ClamAV: Xls.Dropper.EPPlus-9802867-2 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Xls.Dropper.EPPlus-9802867-2
  • ClamAV detection on extracted artifact critical EXTRACTED_FILE_CLAMAV
    ClamAV flagged at least one file extracted from inside this sample. Even when the wrapping document carries no AV detection of its own, a hit on the carved artifact is a strong indicator the sample is a delivery vehicle.
  • Workbook_Open macro high OLE_VBA_WBOPEN
    Workbook_Open macro
  • cmd.exe reference in VBA high OLE_VBA_CMD
    cmd.exe reference in VBA
  • VBA project inside OOXML medium OOXML_VBA
    Document contains a VBA project — VBA macros present
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://18.159.59.253/cut/290091332850986.bat

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
b1fa4a1f91a383e7791b73e3f3e78cd57605d31f2e49f30da23155b0a14ddf14		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 1125 bytes
vbaProject_00.bin
4ecb0d169086e89bca1a58ce3b42a27826c2919284fef7c9a87665f267b7514f		 vba-project OOXML VBA project: xl/vbaProject.bin 5632 bytes
Detection
ClamAV: Xls.Dropper.EPPlus-9802867-2
Obfuscation or payload: unlikely

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