Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 cfc61440394f16f0…

MALICIOUS

Office (OOXML)

41.8 KB Created: 2021-06-22 12:43:05 UTC Authoring application: Microsoft Excel 16.0300
MD5: ea5c4d5bc76876780eb959e4bec10ffe SHA-1: f6bce83f9b3b47ac26dab74d3d228659250f1699 SHA-256: cfc61440394f16f0835e23dccf642eff96f994db0af90b0c3071e7c62565c411
160 Risk Score

Malware Insights

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

The OOXML document contains VBA macros that reference cmd.exe and PowerShell. The GetObject call and the presence of a Base64 decoding function suggest that the macro is designed to decode and execute a payload. The primary function of this macro appears to be downloading and executing a second-stage payload, likely from a remote source.

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
7c7e95df3518ef2a3f42912076eae0ea340bc415b8d2a4decf0e816613f6bc66		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 34430 bytes
vbaProject_00.bin
04e0884c0a2727f91d71f95b17acf488aaee1d21c776b623e90510cbc390bbf8		 vba-project OOXML VBA project: xl/vbaProject.bin 11264 bytes

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