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

Static analysis result for SHA-256 77ffc207f9c28fc1…

MALICIOUS

Office (OOXML) / .XLSM

389.9 KB Created: 2020-01-28 19:47:00 UTC Authoring application: Microsoft Excel 15.0300
MD5: bb84dedc0bc65594c39a0cc5e6e1106d SHA-1: e86dfcba816fa79caa3b2637800e0585de922231 SHA-256: 77ffc207f9c28fc1cc4169ba2b85ccfea3eb04f0b45319fecb351aec717917af
110 Risk Score

Malware Insights

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

The sample contains VBA macros that utilize a Shell() call to execute a PowerShell command. This PowerShell command is constructed by decoding a Base64 string and then downloading a second-stage executable from the URL 'http://52.28.219.17/bi/8/Q/RFQ_ref-020901006.exe' into the user's APPDATA directory and executing it. The document also employs a macro-enable lure to encourage user interaction.

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
6b26cfde7ba81497533fd53138e2989fb21dc1a812927f391bf54558efae8cef		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 5980 bytes
vbaProject_00.bin
e0c5d090df2f4a8e358d1a55efbffb0b9097f06e18d8e69843c19abf8565dd9e		 vba-project OOXML VBA project: xl/vbaProject.bin 10752 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.