Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 5d24a19237355935…

MALICIOUS

Office (OOXML)

41.6 KB Created: 2021-06-22 12:43:05 UTC Authoring application: Microsoft Excel 16.0300
MD5: 0962e15626f149da0c88966a359ddb69 SHA-1: ef1394defbcb0b35090587bfd68aa3ea77ff5baf SHA-256: 5d24a192373559358d2b05fd03e9eb71d3d075ba64fe4904a812c8c2ff524480
160 Risk Score

Malware Insights

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

The OOXML file contains VBA macros that reference PowerShell and cmd.exe, indicating an attempt to execute commands. The GetObject call further suggests the execution of external code. The VBA code includes a Base64 decoding function, which is commonly used to obfuscate malicious payloads. The primary function of the script appears to be downloading and executing 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
cbc47ee17d76dc2eba81e125b858fbb6be0e86add5d8a40d3d0995a35badce21		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 35036 bytes
vbaProject_00.bin
574d56d7cfd0a09f0176fe6d66c8492fcc498237ac9b57d1cb3ef00b63df06e5		 vba-project OOXML VBA project: xl/vbaProject.bin 11264 bytes

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