Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 9d53bc4465dd96c6…

MALICIOUS

Office (OOXML)

41.7 KB Created: 2021-06-22 12:43:05 UTC Authoring application: Microsoft Excel 16.0300
MD5: a7fca84a21ececa7f3eed9fa672a4afe SHA-1: ca00c93e36cec5c2641803cd61d8fab2eee89fc8 SHA-256: 9d53bc4465dd96c6e584b0b4ef62cb9de6ba05232c84b3d4329795adc3718f6f
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 VBA macros within this Excel document contain references to PowerShell and cmd.exe, indicating an attempt to execute arbitrary commands. The presence of a Base64 decoding function suggests obfuscation, likely to hide a payload that downloads and executes a second-stage malicious file. The GetObject call further supports the execution of external code.

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
82c97e239b8e04776e7ef2ff51bafc02e60509cfe06ea3d5c0cfa171990b175a		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 35036 bytes
vbaProject_00.bin
004e3d1050d640b7f02f0767486e307a798b98091bf4ff78706494c66c1daad2		 vba-project OOXML VBA project: xl/vbaProject.bin 11264 bytes

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