Xls.Dropper.EPPlus-9802867-2 — Office (OOXML) / .XLSM malware analysis

Static analysis result for SHA-256 1825870f396a5f68…

MALICIOUS

Office (OOXML) / .XLSM

44.6 KB Created: 2021-10-08 10:35:53 UTC Authoring application: Microsoft Excel 16.0300 First seen: 2023-08-09
MD5: d28336a8cd23646ec8db86ae5e02690f SHA-1: e1dfcdb66ca9df3c32b3bb875f688c30aa1a8e1d SHA-256: 1825870f396a5f687b92ec80c7d5be4936a92c28a3411b22096319e0210c0abf
402 Risk Score

Malware Insights

Xls.Dropper.EPPlus-9802867-2 · confidence 95%

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

The sample is a macro-enabled Excel file containing a Workbook_Open macro that executes obfuscated PowerShell code. This script downloads a file from 'https://pilkishop.ru/images.exe' and saves it as an executable in the temporary directory, then executes it. This indicates a dropper functionality designed to fetch and run a secondary 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
  • Obfuscated VBA Shell command with URL critical OLE_VBA_OBFUSCATED_SHELL_URL
    VBA macro invokes Shell with command text assembled through decoder or string-manipulation functions and includes a URL. This is a high-confidence downloader/dropper pattern, stronger than Shell or URL evidence on their own.
  • 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 https://pilkishop.ru/images.exe

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
75289596d597084c96c1d589aadafb415b50f615fa0e102adf8bd1a173a9e11a		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 1309 bytes
vbaProject_00.bin
c69b9a229b9c55eb00072c34d5138ab9cbc9a7d171e1e3fe582213fcaa3a910f		 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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