Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 c24f70bb4f5617c4…

MALICIOUS

Office (OOXML)

41.6 KB Created: 2021-06-22 12:43:05 UTC Authoring application: Microsoft Excel 16.0300
MD5: 58ed9fc8b3cd0e7b4fbadeb488c9d7df SHA-1: fa0e841843b61b2d3807c3cfa32cb463e5de3c06 SHA-256: c24f70bb4f5617c4c5a1cc7d55d43a830db1612403a1265faeab9edb2b90de6f
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 a Base64 decoding function suggest that the macro is designed to download and execute a second-stage payload. The specific obfuscation and lack of clear URLs prevent further analysis of the payload's destination.

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
03b985b1f1a179f8ae5bf9592dc950c7ffec2e2ae1d7a22d90609afcaecc47d0		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 35036 bytes
vbaProject_00.bin
b7ffd8211a0cad87e5bf058bdeadc6eb2c18a1c7da9ca4af64b2034055d8be6e		 vba-project OOXML VBA project: xl/vbaProject.bin 11264 bytes

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