Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 4cdc3b1cd23320cb…

MALICIOUS

Office (OOXML)

41.6 KB Created: 2021-06-22 12:43:05 UTC Authoring application: Microsoft Excel 16.0300
MD5: b0f9926ba762b682f06eaa949ceb131e SHA-1: f12826451b37a346da2c36be056b948df67a1f8c SHA-256: 4cdc3b1cd23320cb4fb400a727508ee8c1126b4dd0759e49dcba68d22a5f68b9
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 presence of a GetObject call and the critical OLE_VBA_PS heuristic suggest the macros are designed to execute obfuscated commands, likely for downloading and executing a second-stage payload. The VBA code itself appears to be a Base64 decoder, further supporting the obfuscation and payload delivery hypothesis.

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
4f1a43cb751d83c7e1bb0eb92744d775710c5346a9cceafe7fe6b78b13e5e935		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 35036 bytes
vbaProject_00.bin
2dd82e08b9174d74eabacfff78fb934b1010f3b8b618d0769c9798a6e45d8a7d		 vba-project OOXML VBA project: xl/vbaProject.bin 11264 bytes

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