Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 40f0403b448dc051…

MALICIOUS

Office (OOXML)

41.5 KB Created: 2021-06-22 12:43:05 UTC Authoring application: Microsoft Excel 16.0300
MD5: 60c1f94390941d4a4c42efabc8813987 SHA-1: c42c38e7b145b51a83638c4e51d7745e59e9a9b5 SHA-256: 40f0403b448dc051b49f25abfd4cd611ac66f2e11b094bd039dd848f58d6dd3b
160 Risk Score

Malware Insights

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

The critical heuristic 'OLE_VBA_PS' indicates a PowerShell reference within the VBA macros, and 'OLE_VBA_CMD' shows a cmd.exe reference. The 'GetObject' call further suggests dynamic execution. These combined indicators point to the VBA macros being used to launch external commands, most likely to download and execute a secondary payload. The Base64 decoding function present in the script suggests obfuscation of malicious content.

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
55fbb652cd69bff69bc4b2b5cb384cdf04dfae77af1d1fee8db2f12c4b4ffb50		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 34430 bytes
vbaProject_00.bin
075e78717bc6181e8ec6660f5cdf250b1201e03090ccbee8711d466162dc5587		 vba-project OOXML VBA project: xl/vbaProject.bin 11264 bytes

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