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

Static analysis result for SHA-256 fcf3b5248e8d6062…

MALICIOUS

Office (OOXML) / .XLSM

391.9 KB Created: 2020-01-28 19:47:00 UTC Authoring application: Microsoft Excel 16.0300
MD5: 646801cd4d9d42c5be8b56d4db220898 SHA-1: 1e9a398f3f61c0e370517670b8f1d44016a39f1b SHA-256: fcf3b5248e8d60621c463b1146df0b10d13bed5dbc9fd70a0ad12d8a1d56f186
110 Risk Score

Malware Insights

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

This macro-enabled document (XLSM) contains a VBA script that uses the Shell() function to execute a PowerShell command. The PowerShell command is obfuscated but reconstructs to download and execute a file from 'http://koh.gujo.ydns.eu/chobome.exe'. The document also contains a lure instructing the user to enable macros, a common technique for malware delivery. The presence of the Shell() call and the PowerShell execution strongly indicates a downloader or dropper functionality.

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 (4) low OOXML_EXTERNAL_HYPERLINKS
    Document contains 4 external hyperlinks — clickable URLs are stored as external relationships. First target: https://go.microsoft.com/fwlink/?linkid=844732
  • 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=844732
    • https://go.microsoft.com/fwlink/?linkid=844741
    • https://go.microsoft.com/fwlink/?linkid=844736
    • https://go.microsoft.com/fwlink/?linkid=844747
    • https://go.microsoft.com/fwlink/?linkid=844746
    • https://go.microsoft.com/fwlink/?linkid=844728
    • https://go.microsoft.com/fwlink/?linkid=844735
    • https://go.microsoft.com/fwlink/?linkid=844725
    • https://go.microsoft.com/fwlink/?linkid=844738
    • https://go.microsoft.com/fwlink/?linkid=844749
    • http://go.microsoft.com/fwlink/?LinkId=846285
    • https://go.microsoft.com/fwlink/?linkid=844745
    • https://go.microsoft.com/fwlink/?linkid=844751
    • https://go.microsoft.com/fwlink/?linkid=844743
    • https://go.microsoft.com/fwlink/?linkid=844750
    • https://go.microsoft.com/fwlink/?linkid=844726
    • https://go.microsoft.com/fwlink/?linkid=844742
    • https://go.microsoft.com/fwlink/?linkid=844734
    • http://go.microsoft.com/fwlink/?LinkId=844969

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
b6dcead97156dde03b28730eefd44443dee7f0784d07450979d0db1deb705946		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 5848 bytes
vbaProject_00.bin
96a4bbd1a76a3e2e32ebcdf81a675d98e0240684bd4f7815e9fa4248f9cd39c0		 vba-project OOXML VBA project: xl/vbaProject.bin 10240 bytes

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