Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 8263e8d880b9a340…

MALICIOUS

Office (OOXML)

41.5 KB Created: 2021-06-22 12:43:05 UTC Authoring application: Microsoft Excel 16.0300
MD5: fcf54fe2e4b3fd8da60f38afb14a8ffd SHA-1: 665673830513dc1e3e515cf0c166da31b8cd7f84 SHA-256: 8263e8d880b9a34044df2045224b53c92a3476476047fe9b8eb7c47aa95c8b50
160 Risk Score

Malware Insights

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

The OOXML document contains VBA macros that reference cmd.exe and PowerShell. The GetObject call and the presence of VBA macros suggest an attempt to execute arbitrary code. The VBA code includes a Base64 decoding function, indicating that it is likely used to obfuscate and download 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
c38766ec6799298c72231f2299825afd795bee44d2204e43eb7610a7c76474fe		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 34430 bytes
vbaProject_00.bin
feaecbce9994f04ff897a3b3560d42f32479f2d4ccb07224fb25bf12a9f1ced7		 vba-project OOXML VBA project: xl/vbaProject.bin 11264 bytes

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