Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 88a44e4707bb5d1a…

MALICIOUS

Office (OOXML)

41.6 KB Created: 2021-06-22 12:43:05 UTC Authoring application: Microsoft Excel 16.0300
MD5: 8036bdeed600278b677d335710add117 SHA-1: 335f8c51f179feb6042e9f8b5740a391c22854f7 SHA-256: 88a44e4707bb5d1a1ae99cd217c18594ab1f646aa9119ab4fa3736df32911fc2
160 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1059.003 Windows Command Shell T1566.001 Spearphishing Attachment

The OOXML file contains VBA macros that reference PowerShell and cmd.exe. The presence of a GetObject call further suggests dynamic execution. The VBA code appears to be heavily obfuscated, but its intent is likely to download and execute a secondary payload. The file is classified as malicious, and the techniques observed point towards a macro-based initial access vector.

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
0d55fc172b18145c1819976327983bb85a5116c576f87dd7337d6b528063d501		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 35036 bytes
vbaProject_00.bin
1118b79176d57d82570db4f0b0360edb2c0ebf3970ce8f64187f7becdedd4272		 vba-project OOXML VBA project: xl/vbaProject.bin 11264 bytes

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