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

Static analysis result for SHA-256 0d94f4a2977aad01…

MALICIOUS

Office (OOXML) / .XLSM

102.2 KB Created: 2021-08-19 14:03:52 UTC Authoring application: Microsoft Excel 15.0300
MD5: b3b578dafbdb0d3f85bcaad2d8e9a083 SHA-1: e33ffa8ea4178b92a450a17022c1c7c5ad7300f4 SHA-256: 0d94f4a2977aad0199ae626ba2a3d13261e13bd4a7e49c938e6ec5d027a2a9a7
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 to download a batch file from http://18.156.129.63/entity/58592535399.bat using certutil and then executes the downloaded file. This indicates a dropper functionality, aiming to fetch and run a second-stage payload.

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://18.156.129.63/entity/58592535399.bat

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
9b0c4bce0ee9e93b33a667c83d4bf93ca93d7a6ecae71ce9543d4f7df1626c16		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 1114 bytes
vbaProject_00.bin
f6e07fc67488f65d9ddf35eb6102e7dbb8a23c64b31a18ee2ccdb4eccc2f5d6f		 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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