Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 bab7f5d4ac8fa9ad…

MALICIOUS

Office (OOXML)

41.6 KB Created: 2021-06-22 12:43:05 UTC Authoring application: Microsoft Excel 16.0300
MD5: e20b0e564e9a5d212e89809edf8171db SHA-1: b8912283ef8a1a9d7f8c13722380f8fa3b9ba76c SHA-256: bab7f5d4ac8fa9ad28591606441afb213f61485277e0296ac6211592b9f051c4
160 Risk Score

Malware Insights

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

The OOXML document contains VBA macros that reference PowerShell and cmd.exe. The GetObject call is also a strong indicator of malicious intent. The VBA code appears to be obfuscated, but its likely purpose is to download and execute a second-stage payload. The family is unknown due to the lack of specific indicators.

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
96397edf7e4dffb4477fe7f6011a701e613cce5337ae0f861887d2e8428e516c		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 35036 bytes
vbaProject_00.bin
a7c02bc9fe454f950071ac100deced1c1ba18fe1f99dc02aa880fb233043ccca		 vba-project OOXML VBA project: xl/vbaProject.bin 11264 bytes

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