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

Static analysis result for SHA-256 b18796fe4a4cf8e2…

MALICIOUS

Office (OOXML) / .XLSM

430.9 KB Created: 2021-08-19 14:03:52 UTC Authoring application: Microsoft Excel 15.0300 First seen: 2024-05-31
MD5: d01710a02c214a5f6e0197fd291c0b10 SHA-1: 3b2ed35df644d1684660543c56370dc8686e1a53 SHA-256: b18796fe4a4cf8e20e1a54ec3773c819533cb15a545093d1c6e19ce14efaa93d
402 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1059.001 PowerShell T1204.002 Malicious File T1071.001 Web Protocols

The Workbook_Open macro in this XLSM file is designed to execute a PowerShell command. This command downloads a file from the URL "http://185.205.187.173/xd/Copy0761000025pdf.exe", saves it as an executable in the temporary directory, and then runs it. This is a common dropper pattern for delivering secondary payloads.

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 http://185.205.187.173/xd/Copy0761000025pdf.exe

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
e4c531dfd9b27b4d0969b603bda43d3a178f7469152448246a6034c2e2deed64		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 1267 bytes
vbaProject_00.bin
17c1cf5357d1c979eaabfd602d204845550e2e40a5a0d294c591a85da38d4a65		 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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