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

Static analysis result for SHA-256 b3ba93737b54af87…

MALICIOUS

Office (OOXML) / .XLSM

363.2 KB Created: 2021-08-19 14:03:52 UTC Authoring application: Microsoft Excel 15.0300 First seen: 2022-11-14
MD5: d77b7c72f4017e1c900a2dba8ef7d43c SHA-1: 254be5aa9133bacdaf83640564a95ddc81da5b25 SHA-256: b3ba93737b54af8728671f93974694e45cfcdf48fd02963740399b60ed9fea2d
342 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Service Execution: Visual Basic T1204.002 Malicious File: User Execution: Malicious File T1105 Ingress Tool Transfer T1059.003 Command and Scripting Interpreter: Windows Command Shell

The Workbook_Open macro executes a command using cmd.exe to download a file from the embedded URL using certutil.exe and then executes the downloaded file. This indicates a downloader or dropper functionality, consistent with the ClamAV detection of Xls.Dropper.EPPlus-9802867-2.

Heuristics 8

  • 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
  • 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://37.139.128.94/dx/Doc60521706.exe

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
add2ca66d4940bc5cb534128e6d7a0ad377d566d630084cb75a01e269fa07338		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 1086 bytes
vbaProject_00.bin
57b7a1148a0d6ced52ad2ffc5a7855bea03e2f3f96963c404297b09e05686c9b		 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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