Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 f747648f3e6d1863…

MALICIOUS

Office (OOXML)

41.6 KB Created: 2021-06-22 12:43:05 UTC Authoring application: Microsoft Excel 16.0300
MD5: a1434ee4f46f45a96b3f03b9e417d2b5 SHA-1: c9edc3a3eb1039157210c669506423cf0cde7a83 SHA-256: f747648f3e6d1863c9a7ca83099f40ff5c608d1bf2ad64f3bdbf7f0e8677cc70
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 PowerShell and cmd.exe. The presence of a GetObject call further suggests dynamic execution. The VBA code appears to be obfuscated, but its intent is likely to download and execute a second-stage payload, indicated by the PowerShell and cmd.exe references. The document was likely delivered as a spearphishing attachment.

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
987a663169d2f23023f5d07d943e29786fab0fc1d43f068df460cebb13479035		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 35036 bytes
vbaProject_00.bin
a45e34ffa19915198f4cc2dd280bc7b11001bc939099641827be30bead2b86bf		 vba-project OOXML VBA project: xl/vbaProject.bin 11264 bytes

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