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

Static analysis result for SHA-256 8744857085a019e8…

MALICIOUS

Office (OOXML) / .XLSM

27.3 KB Created: 2021-08-19 14:03:52 UTC Authoring application: Microsoft Excel 15.0300 First seen: 2022-03-08
MD5: 38ec368502e3063566a4fb3fc0f1146d SHA-1: 9e3123641b6ba72b38dfb71786a29a21d39827d6 SHA-256: 8744857085a019e8dd048176fa47a5f34aa80a7a1a26d00528c047316612522d
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 script from the URL http://52.59.234.180/class/ten/65087710033.bat using certutil and then executes the downloaded file. This indicates a downloader pattern, likely 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://52.59.234.180/class/ten/65087710033.bat

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
c88f0b9882622c588e0f32a2c132e804f9dfaf09bd9a3fcc3acc3f435c03ac8b		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 1117 bytes
vbaProject_00.bin
55c3ca57c23d66b0d7714a7f10306740e1be0e46b3990dce5b659a665dc1b04f		 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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