Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 31c21879ce67978c…

MALICIOUS

Office (OOXML)

41.5 KB Created: 2021-06-22 12:43:05 UTC Authoring application: Microsoft Excel 16.0300
MD5: c912d74e5ac32f0e69fa9c7d861f1bf3 SHA-1: c0cee56c35682d725115c3262f9d265948ccc468 SHA-256: 31c21879ce67978cbae9741fde86285a97e531f31b02bfac402f94ff5517f3b0
160 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1059.005 Visual Basic T1059.003 Windows Command Shell T1204.002 Malicious File

The file is an Office document containing VBA macros. Heuristics indicate the VBA code references PowerShell and cmd.exe, and uses 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 specific family is not identifiable from the provided evidence.

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
5f06b5a81a3da2efe6e82933ffb93ccf8da703db6f806d33b0a5afb55cd6d337		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 34430 bytes
vbaProject_00.bin
62b5653aecf80fb129f16e8e9823a1a23924a7f80c2dc7213ff4c49cbc665107		 vba-project OOXML VBA project: xl/vbaProject.bin 11264 bytes

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