Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 ba09efdc8985adff…

MALICIOUS

Office (OOXML)

41.7 KB Created: 2021-06-22 12:43:05 UTC Authoring application: Microsoft Excel 16.0300
MD5: f8cdd2fc809cec08fa30857c751fdde1 SHA-1: f58a26fe28215661c77146be4a47bda273d350ca SHA-256: ba09efdc8985adffdc581c8834971c3d414040ab7631a7299c89c426488b5552
160 Risk Score

Malware Insights

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

The critical heuristic 'OLE_VBA_PS' indicates that VBA macros within this OOXML document reference PowerShell. Additionally, 'OLE_VBA_CMD' and 'OLE_VBA_GETOBJ' suggest the use of cmd.exe and GetObject, common for executing downloaded payloads. The presence of a large VBA macro, likely containing obfuscated code, further supports the conclusion that this document is designed to download and execute a secondary malicious component. The lack of specific URLs or clear command strings prevents further IOC extraction.

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
ce3945ec10161233d32bca00867d46487c565d9e9efa45a439bfacf2aede3a24		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 35036 bytes
vbaProject_00.bin
b9fe05100a48b19d8699d1df06b3eefc4a8152e886b6f8e342e2336de2017549		 vba-project OOXML VBA project: xl/vbaProject.bin 11264 bytes

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