Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 603c3ba7b6ea3691…

MALICIOUS

Office (OOXML)

41.6 KB Created: 2021-06-22 12:43:05 UTC Authoring application: Microsoft Excel 16.0300
MD5: 38cf51be54113aa36207b441772a53e8 SHA-1: b5015abd88495df8973c06e9e3538f6d98dcf835 SHA-256: 603c3ba7b6ea3691407a8c71ea6eaa887b368739b46526598c3dbafdb132338b
160 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1059.001 PowerShell T1059.003 Windows Command Shell

The Excel document contains VBA macros that reference cmd.exe and PowerShell. The GetObject call and the presence of VBA macros strongly suggest an attempt to execute arbitrary code. The VBA code appears to be obfuscated, but the references to cmd.exe and PowerShell indicate a likely intent to download and execute a second-stage payload.

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
613d5d8609823046243ff7eef3c53879a32a9bb388663fe5a6ddef2a6beb616e		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 35036 bytes
vbaProject_00.bin
bd74cf0f201aade8e20cfccaedc009400fb4d792662e3d458332eca5bad8e46e		 vba-project OOXML VBA project: xl/vbaProject.bin 11264 bytes

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