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

Static analysis result for SHA-256 3ddfa7d877b76a4f…

MALICIOUS

Office (OOXML) / .XLSM

389.9 KB Created: 2020-01-28 19:47:00 UTC Authoring application: Microsoft Excel 15.0300
MD5: c1d17babb7e4b007574ba23373248960 SHA-1: 75202ea510ad204b25b7269efcd14512d1012884 SHA-256: 3ddfa7d877b76a4fd4b9d8d241cdc0ab0688f8692cef01b507b9280290bc10ea
110 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1204.002 Malicious File T1566.001 Spearphishing Attachment T1059.005 Visual Basic

The document contains VBA macros that, when executed, construct and run a PowerShell command. This command downloads a second-stage executable from the hardcoded URL 'http://18.159.14.5/nbl/joy/1,1/Sample_70120351252_IS_003727.exe' and saves it as 'Xtnagnafeice.exe' in the user's APPDATA directory. The script also attempts to register this executable for execution via the registry key HKCU\Software\Microsoft\Windows\CurrentVersion\SysWOW64\PowerShell\1.0\shell. The presence of the 'SE_ENABLE_LURE' heuristic indicates the document is designed to trick users into enabling macros.

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
3799685d880a553fbea42607a93abfe1636bd1696e1b508937c85f3e53f6f651		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 5945 bytes
vbaProject_00.bin
07d47dba5752b14bd7a7c648114e9daf8fe9376710dcd74e0b547ab26516e519		 vba-project OOXML VBA project: xl/vbaProject.bin 10752 bytes

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