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

Static analysis result for SHA-256 1912f5c4fd7d4edd…

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: f3fdc3313e3d18976fc1645f0e4ecd2c SHA-1: 33739b475fcf1319cec2007ca7e8a05d98e4cd6a SHA-256: 1912f5c4fd7d4edda44d4e7a0db0b04329ac31103c3fb4b23030dbb9758d4b85
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 an executable file from the URL http://3.65.2.139/read/Phdymmrmanm.exe and execute it. This behavior is indicative of a dropper, aiming to fetch and run a secondary malicious payload.

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/Phdymmrmanm.exe

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
90fd44ef303f8e67082d41a82dd1092999b6232ff835be59a032bb9745b47620		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 1244 bytes
vbaProject_00.bin
e1ba93c70df66223c2fed3b7fcc3cc4b96208b1fc19bf8d59a680e29b640fda1		 vba-project OOXML VBA project: xl/vbaProject.bin 5120 bytes
Detection
ClamAV: Xls.Dropper.EPPlus-9802867-2
Obfuscation or payload: unlikely

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