Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 4f5633ca0a2c5095…

MALICIOUS

Office (OOXML)

41.6 KB Created: 2021-06-22 12:43:05 UTC Authoring application: Microsoft Excel 16.0300
MD5: 571153aa17a9a60fd60082c0db946978 SHA-1: bc72b436d81a9a3d0344a6c08ed32358b519bbb5 SHA-256: 4f5633ca0a2c5095da5b51a2cefbc5084f2d36fc7cb56fee3770b9f751c0029f
160 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1059.003 Windows Command Shell T1566.001 Spearphishing Attachment

This Excel document contains VBA macros that reference cmd.exe and PowerShell. The GetObject call and the presence of VBA macros suggest an attempt to execute arbitrary code. The VBA code appears to be heavily obfuscated, making it difficult to determine the exact payload, but the overall pattern indicates a downloader or initial execution stage for a more complex attack.

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
04ce0d82c3da891d4d965c9406f9fb37c69338da5f995634635d7b3a87ee5cdb		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 35036 bytes
vbaProject_00.bin
8e045d42bb9c1f7023de912e93339a5aa29edf50f01155a42575e38e9516871f		 vba-project OOXML VBA project: xl/vbaProject.bin 11264 bytes

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