Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 b8b68fbbefd98987…

MALICIOUS

Office (OOXML)

41.6 KB Created: 2021-06-22 12:43:05 UTC Authoring application: Microsoft Excel 16.0300
MD5: eb27f669da2c85b81357dd718c518d1e SHA-1: ebec9b53018cde8431c8ca51d264904a8059c09f SHA-256: b8b68fbbefd98987fb02a03d53df9579e55b6870324df6f3781b90ea94f1c097
160 Risk Score

Malware Insights

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

The file is an Office document containing VBA macros. Heuristics indicate the macros reference PowerShell and cmd.exe, and use GetObject. The VBA code itself appears to be heavily obfuscated, but the presence of these references strongly suggests it's designed to download and execute a secondary payload. The file is therefore classified as a malicious macro-based downloader.

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
892c486efca6c467b5e81cfd26b94255baaf35795e78ec14490c571a0d60da92		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 35036 bytes
vbaProject_00.bin
26c5d4aed584ca2fa6569c9498cfdb6f910c028a07fd9293792e1ef7320c1434		 vba-project OOXML VBA project: xl/vbaProject.bin 11264 bytes

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