Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 182a0f3fa93b765a…

MALICIOUS

Office (OOXML)

41.5 KB Created: 2021-06-22 12:43:05 UTC Authoring application: Microsoft Excel 16.0300
MD5: 9cc8f450c726396cc08ae1d738c76984 SHA-1: d09645591c28b3524fee150071be1bbf4f82e3ea SHA-256: 182a0f3fa93b765a527bfb047988d69ef5436344381f7671934154f824522024
160 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1059.001 PowerShell T1059.003 Windows Command Shell T1204.002 Malicious File

The OOXML document contains VBA macros that reference PowerShell and cmd.exe. The GetObject call and the presence of a VBA project suggest an attempt to execute malicious code. The VBA macro itself appears to be heavily obfuscated, but its likely purpose is to download and execute a second-stage payload, indicated by the critical heuristic firing for PowerShell reference in VBA.

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
5fc6d44ab86d5b6380171990ffa1a5a5ed1ba60423901c148cba468446e4ef08		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 34430 bytes
vbaProject_00.bin
240bf9d57afd49e85790998d8661c1d598270c89317f33441b4c29ed6b65a042		 vba-project OOXML VBA project: xl/vbaProject.bin 11264 bytes

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