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

Static analysis result for SHA-256 67ecd3f6a17063ab…

MALICIOUS

Office (OOXML) / .XLSM

719.0 KB Created: 2023-01-22 11:25:16 UTC Authoring application: Microsoft Excel 15.0300 First seen: 2023-01-23
MD5: 81941a5f6444e18ecf9c266ef4cbb3d2 SHA-1: 495838574760ea0123d0e4bd6a60fb3db015797d SHA-256: 67ecd3f6a17063ab4dcd9b61ed3f976cd98e5efa774ac9e86e171b1b332e5cf0
402 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1059.005 Visual Basic T1204.002 Malicious File T1105 Ingress Tool Transfer

The Workbook_Open macro within this XLSM file utilizes WScript.Shell and PowerShell to download a second-stage executable from the URL http://3.65.2.139/read/Booking-02.exe and execute it. The script explicitly constructs and runs the PowerShell command to achieve this. This behavior is consistent with a macro-based downloader.

Heuristics 9

  • Shell() call in VBA critical OLE_VBA_SHELL
    Shell() call in VBA
  • WScript.Shell usage critical OLE_VBA_WSCRIPT
    WScript.Shell usage
  • PowerShell reference in VBA critical OLE_VBA_PS
    PowerShell 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
  • CreateObject call high OLE_VBA_CREATEOBJ
    CreateObject call
  • 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://3.65.2.139/read/Booking-02.exe

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
238906fd0aaea33305bba6f25897c1b297cfabe63bcaf16fb7d8ff8c62a568c5		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 1243 bytes
vbaProject_00.bin
3651c326f5e1b05eb75cfcc75e91062c2b35a04a1fee53e9f7646cf4f31354b8		 vba-project OOXML VBA project: xl/vbaProject.bin 5120 bytes
Detection
ClamAV: Xls.Dropper.EPPlus-9802867-2
Obfuscation or payload: unlikely

Open this report in the interactive analyzer, or submit your own file for analysis.