Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 4448cbb12b25455a…

MALICIOUS

Office (OOXML)

41.6 KB Created: 2021-06-22 12:43:05 UTC Authoring application: Microsoft Excel 16.0300
MD5: 18766e64ad906960162ee72a99f1c932 SHA-1: 31b27af32a9753be92411f78a2b20263d879073e SHA-256: 4448cbb12b25455a72b67bb7a1594ec1b5ba733b1ddceaa4d1c1ac43ea6f70dd
160 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1059.003 Windows Command Shell T1566.001 Spearphishing Attachment

This OOXML document contains VBA macros that reference cmd.exe and PowerShell. The critical heuristic 'OLE_VBA_PS' indicates a PowerShell reference within the VBA, suggesting the macros are used to execute PowerShell commands. The 'GetObject' and 'cmd.exe' references further support the idea that the macros are designed to launch external processes. The primary function of these macros appears to be downloading and executing a secondary payload, a common technique for initial access via spearphishing attachments.

Heuristics 4

  • PowerShell reference in VBA critical OLE_VBA_PS
    PowerShell reference in VBA
  • GetObject call high OLE_VBA_GETOBJ
    GetObject call
  • cmd.exe reference in VBA high OLE_VBA_CMD
    cmd.exe reference in VBA
  • VBA project inside OOXML medium OOXML_VBA
    Document contains a VBA project — VBA macros present

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
e0415a44fbf83cd93d0fd75a5d1db43853d252de4c85bba47152cc11911ae183		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 35036 bytes
vbaProject_00.bin
9023b28de5f4ac16c840658b56face0547d848bbabf39123f012e67a62ca8966		 vba-project OOXML VBA project: xl/vbaProject.bin 11264 bytes

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