Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 6c424c84f4746dd5…

MALICIOUS

Office (OOXML)

41.6 KB Created: 2021-06-22 12:43:05 UTC Authoring application: Microsoft Excel 16.0300
MD5: 23362ba7ef8bb0aedf886ba08865fa74 SHA-1: 360c3fb371d0cfaf5fd272c0d60208b43831cedf SHA-256: 6c424c84f4746dd5a827fd2fe0f959e1d97c8e4472cad1dd9a035775f11fa80d
160 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1566.001 Spearphishing Attachment T1059.005 Visual Basic

The OOXML document contains VBA macros that reference PowerShell and cmd.exe, indicating an attempt to execute arbitrary commands. The presence of a GetObject call further suggests the execution of external code. The VBA code itself appears to be obfuscated, but its intent is to leverage these commands for malicious purposes, likely to download and execute a secondary 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
dea7f4388c07240365fb33e8604eb21e5ac52ce96bac8df8bbb263774e166d18		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 35036 bytes
vbaProject_00.bin
f784ed6473f979968a32115ae5092fab0ce87737e5d4cc91c4482f569958bcff		 vba-project OOXML VBA project: xl/vbaProject.bin 11264 bytes

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