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

Static analysis result for SHA-256 2872142e625a1497…

MALICIOUS

Office (OOXML) / .XLSM

41.8 KB Created: 2020-01-28 19:47:00 UTC Authoring application: Microsoft Excel 15.0300 First seen: 2023-01-24
MD5: 51811249f42ffd6cccc8cdd95af6a2a5 SHA-1: e8b3d53e204e43ebb37838084f2c9cbdd7c83f57 SHA-256: 2872142e625a14976128d49e5af9ffd5a623b8829539d85fdb82b1a4cbac729c
430 Risk Score

Malware Insights

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

MITRE ATT&CK
T1059.001 PowerShell T1204.002 Malicious File: User Execution: Malicious File T1140 Deobfuscate/Decode Files or Information T1059.005 Visual Basic

The sample is an XLSM file containing a Workbook_Open macro that uses WScript.Shell to execute a PowerShell command. This command downloads a second-stage executable from http://3.65.2.139/read/Otblasbjyd.exe and executes it. The document body attempts to lure the user into enabling macros by presenting a fake tour and a "yellow bar" warning.

Heuristics 11

  • 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
  • Macro/content-enable lure medium SE_ENABLE_LURE
    Document instructs the user to enable macros or editing — a common technique used by malware droppers to bypass Office macro security settings
  • External hyperlinks (3) low OOXML_EXTERNAL_HYPERLINKS
    Document contains 3 external hyperlinks — clickable URLs are stored as external relationships. First target: http://go.microsoft.com/fwlink/?LinkId=846285
  • 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/Otblasbjyd.exe
    • http://go.microsoft.com/fwlink/?LinkId=846285
    • http://go.microsoft.com/fwlink/?LinkId=844969

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
63fbdf6eb5739867efaed87a3a64152d933f9c6741cd5a1f213a5cf46cd1b531		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 1547 bytes
vbaProject_00.bin
2cf527edc95c82b63a84629456a441d5a25049246eb34bfc7ff9ab624459a135		 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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