Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 b981f4331595af13…

MALICIOUS

Office (OOXML)

41.6 KB Created: 2021-06-22 12:43:05 UTC Authoring application: Microsoft Excel 16.0300
MD5: 0fb6e3c879babe6238157f63990d076b SHA-1: ad3380d3a81358473beccfa561d535a3b696ec6a SHA-256: b981f4331595af13ffff103bb8cd3e9af645182dd2a9b87ce97373a5a70fa7f5
160 Risk Score

Malware Insights

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

The OOXML file contains VBA macros that reference cmd.exe and PowerShell. The critical heuristic 'OLE_VBA_PS' indicates a PowerShell reference within the VBA code. The 'GetObject' and 'cmd.exe' references suggest the macro is designed to execute external commands, likely to download and run a second-stage payload. The presence of VBA macros and the execution of external commands strongly suggest a spearphishing attachment attack vector.

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
f7e9899e0dea50370287c8610ac282fc1cb5b506697db779b512fb1328890e05		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 35036 bytes
vbaProject_00.bin
dc0493fbbcb723ebb5054c5fb8cb4aa08926830ede571fad246b2b79806cf854		 vba-project OOXML VBA project: xl/vbaProject.bin 11264 bytes

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