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

Static analysis result for SHA-256 35871beee11759b3…

MALICIOUS

Office (OOXML) / .XLSM

390.0 KB Created: 2020-01-28 19:47:00 UTC Authoring application: Microsoft Excel 15.0300
MD5: 58dc9ccb8187fd0b6ed26246621ebdeb SHA-1: 268d21fe1053699dfff242fdcd6aab78928cf25b SHA-256: 35871beee11759b36f67871d767ef10465e73e588f266904c33aadc840923580
110 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1204.002 Malicious File T1566.002 Spearphishing Attachment

This XLSM document contains VBA macros that employ a "enable macros" lure. The Workbook_Activate subroutine triggers the execution of a PowerShell script. This script downloads a second-stage executable from the URL "http://18.159.14.52/nbb/joy/1-1/Sample_5012035252_ISO_0037252.exe" and executes it. The script also attempts to establish persistence by writing to the registry key HKCU\Software\Microsoft\Windows\CurrentVersion\SysWOW64\PowerShell\1.0\win-1.exe.

Heuristics 5

  • Shell() call in VBA critical OLE_VBA_SHELL
    Shell() call in VBA
  • VBA project inside OOXML medium OOXML_VBA
    Document contains vbaProject.bin — 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 (6) low OOXML_EXTERNAL_HYPERLINKS
    Document contains 6 external hyperlinks — clickable URLs are stored as external relationships. First target: https://go.microsoft.com/fwlink/?linkid=844736
  • 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://go.microsoft.com/fwlink/?linkid=844736
    • http://go.microsoft.com/fwlink/?LinkId=844969
    • https://go.microsoft.com/fwlink/?linkid=844749
    • https://go.microsoft.com/fwlink/?linkid=844741
    • https://go.microsoft.com/fwlink/?linkid=844732
    • https://go.microsoft.com/fwlink/?linkid=844725
    • https://go.microsoft.com/fwlink/?linkid=844742
    • https://go.microsoft.com/fwlink/?linkid=844734
    • https://go.microsoft.com/fwlink/?linkid=844751
    • https://go.microsoft.com/fwlink/?linkid=844745
    • https://go.microsoft.com/fwlink/?linkid=844743
    • https://go.microsoft.com/fwlink/?linkid=844728
    • https://go.microsoft.com/fwlink/?linkid=844746
    • https://go.microsoft.com/fwlink/?linkid=844747
    • https://go.microsoft.com/fwlink/?linkid=844726
    • https://go.microsoft.com/fwlink/?linkid=844738
    • https://go.microsoft.com/fwlink/?linkid=844735
    • https://go.microsoft.com/fwlink/?linkid=844750
    • http://go.microsoft.com/fwlink/?LinkId=846285

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
884de00737dbba1d9bb9a0a17939c35a4e6d985daafefbefb338887fd4383a9b		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 6053 bytes
vbaProject_00.bin
3e65646a7f5440e97167fb93536972bb121c43637f3d8a22e63c2369bd7b47b6		 vba-project OOXML VBA project: xl/vbaProject.bin 10752 bytes

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