Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 a01ce6c4affb6207…

MALICIOUS

Office (OOXML)

41.6 KB Created: 2021-06-22 12:43:05 UTC Authoring application: Microsoft Excel 16.0300
MD5: fe24f23ef16cfdfc944e0f949ecb630f SHA-1: 2fee02781ed853bb486dd917868143609bb3c4d6 SHA-256: a01ce6c4affb62073950d3c1010457e1eb22acc9ef0de3581c2612c9651c2388
160 Risk Score

Malware Insights

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

The file is an OOXML document containing VBA macros. Heuristics indicate the VBA code references PowerShell and cmd.exe, and uses the GetObject function. The VBA code itself appears to be heavily obfuscated, but the presence of these indicators suggests it is designed to execute malicious commands, likely downloading and running a second-stage payload. The Decode64 function is present, which is commonly used to decode obfuscated strings.

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
4555da1fd63037622ece70d0ac89f441f0ebef45ee9624b306a065d24b5544f2		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 35036 bytes
vbaProject_00.bin
16be21c1732777a7de5e2a66cd932bcf197871de1458bcdc80db7d6f68c07067		 vba-project OOXML VBA project: xl/vbaProject.bin 11264 bytes

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