Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 564eb769c9c8abc8…

MALICIOUS

Office (OOXML)

41.6 KB Created: 2021-06-22 12:43:05 UTC Authoring application: Microsoft Excel 16.0300
MD5: 5d0ebd069d856ad7b634c9a0de7462fc SHA-1: abaffdb2e0b4590511fee1cd197c55814f759fc0 SHA-256: 564eb769c9c8abc87886037794a19c520616da444574594df42c26a27d4eb51f
160 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1059.001 PowerShell T1059.003 Windows Command Shell

The OOXML document contains VBA macros that reference cmd.exe and PowerShell. The critical heuristic 'OLE_VBA_PS' indicates a PowerShell reference within the VBA, and the high heuristics 'OLE_VBA_GETOBJ' and 'OLE_VBA_CMD' suggest the use of GetObject and cmd.exe. The VBA code itself appears to be heavily obfuscated, but its likely purpose is to execute further commands, potentially downloading and running 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
04ffad1292c39e432c63045a822660e6417b024522be38eac68ecc0dfff6cef2		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 35036 bytes
vbaProject_00.bin
ec3c2453452557568a59f1ee86b0cf5f9f6401e2c7c79b59737415640ef9c5e0		 vba-project OOXML VBA project: xl/vbaProject.bin 11264 bytes

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