Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 e748f55ea07f7ff3…

MALICIOUS

Office (OOXML)

41.6 KB Created: 2021-06-22 12:43:05 UTC Authoring application: Microsoft Excel 16.0300
MD5: 83aa454506dbd4d7cdd9d0e374830ad5 SHA-1: 35cc75f05427e37c5c9f0fee0aa820eac289ac48 SHA-256: e748f55ea07f7ff395b57865ff10c75abb8ae4aaf5f0bd0aabf993897cc7904b
160 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1059.001 PowerShell T1204.002 Malicious File

The OOXML document contains VBA macros that reference cmd.exe and PowerShell. The GetObject call and the presence of a VBA project strongly suggest malicious intent. The VBA code appears to be obfuscated, but the critical heuristic indicates a PowerShell reference, likely for downloading and executing a secondary payload. The document's purpose is to lure the user into opening it and enabling macros, leading to the execution of this malicious script.

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
2c204fcd84795e3a5cae038ec58338e7cf6fc6b501ae626610891043e7e0d1a2		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 35036 bytes
vbaProject_00.bin
10594179bd5709f1a7ae7995df3fd12c687f4c68abd5354a9dd289312e948b17		 vba-project OOXML VBA project: xl/vbaProject.bin 11264 bytes

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