Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 b7535dec1787bbca…

MALICIOUS

Office (OOXML)

41.6 KB Created: 2021-06-22 12:43:05 UTC Authoring application: Microsoft Excel 16.0300
MD5: 7b164361835b4f67f8b4331ac7033ead SHA-1: 02d00b490b056c0178385da2941a1414a3ba17a0 SHA-256: b7535dec1787bbcacb3eae4bd461f2e17ee60e65802297373b0b0cf6af541cdf
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
d967716ea63c7f510fd962e44cbb635d89a18da67bee0c832de710525323afee		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 35036 bytes
vbaProject_00.bin
c513be77bd188573dc63f87910ccdd3ef1e2eb6ff3ac620f9958cbea47b0e5d6		 vba-project OOXML VBA project: xl/vbaProject.bin 11264 bytes

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