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

Static analysis result for SHA-256 5e7e397bfde25401…

MALICIOUS

Office (OOXML) / .XLSM

102.2 KB Created: 2021-08-19 14:03:52 UTC Authoring application: Microsoft Excel 15.0300
MD5: abd8ae38686db0f60f37161a35cf3dcd SHA-1: d106525b6fc4e41b421cb82b9e7c071e950f70c0 SHA-256: 5e7e397bfde254014cca0afdd9bd5378392132ff0f0cf9e1c5dcd42cc5123150
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 Workbook_Open macro executes a command that uses certutil to download a batch file from http://18.159.59.253/cut/252199835184030.bat and then executes it. This indicates the sample is a downloader for a secondary payload, likely malicious given the ClamAV detection.

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/252199835184030.bat

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
4eafb5cfdff74e9b18967c51f364c1b279f2a477a7d61dda1abd10652b6b5e4d		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 1097 bytes
vbaProject_00.bin
e3181d2ea44ef6923a9d45acb2d5079bc576b221314d242cec729b73b64a245b		 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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