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

Static analysis result for SHA-256 1c4065a74e498f81…

MALICIOUS

Office (OOXML) / .XLSM

102.2 KB Created: 2021-08-19 14:03:52 UTC Authoring application: Microsoft Excel 15.0300 First seen: 2022-02-28
MD5: 4c6f7d395c1be706445704dafba0851b SHA-1: 88589daa34d34319b738074a55fe5df0ad26450e SHA-256: 1c4065a74e498f81e52e540a9256d9dd6ae977db47e4e23261082dd243b0b6e6
382 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1204.002 Malicious File T1059.003 Windows Command Shell

The VBA macro within the Excel document executes a command using cmd.exe to download a batch script from the URL http://13.231.238.12/board/IMG_106520007520.bat and then executes it. This indicates a downloader or dropper functionality, aiming to fetch and run a second-stage payload. The ClamAV detection of 'Xls.Dropper.EPPlus-9802867-2' further supports this assessment.

Heuristics 9

  • 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
  • Suspicious extracted artifact high EXTRACTED_FILE_STATIC_TRIAGE
    One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.
  • VBA project inside OOXML medium OOXML_VBA
    Document contains vbaProject.bin — 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://13.231.238.12/board/IMG_106520007520.bat

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
816e9ae7b3cfa125f5cec19cc371d79679d42d50bc8c67a5fda10bc1e83f74db		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 1098 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved macro source contains an auto-exec entry point and execution/download terms.
vbaProject_00.bin
67e832c894570182c70bcfd4859846277fc3701b8cc680d490172eaaea0283e7		 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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