Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 680d8b951214a23e…

MALICIOUS

Office (OOXML)

41.6 KB Created: 2021-06-22 12:43:05 UTC Authoring application: Microsoft Excel 16.0300
MD5: cc3f53eac08112754201f0a23df79ef6 SHA-1: 7fe0601dfce3482d8ba164e462bedc757d3da793 SHA-256: 680d8b951214a23eb593fdaa4e3af11d420646f24b0b1482dc9614e69f7009fb
160 Risk Score

Malware Insights

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

The OOXML file 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 a likely attempt 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
368d45c4ac66c28a55100c90dbd11f55abf2875e4669e98ef8f83e8ca5fe0f82		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 35036 bytes
vbaProject_00.bin
cfd823b2d737503787ec898358ea2ee62aaf9cf0e7b2e62ff70312d98451fda1		 vba-project OOXML VBA project: xl/vbaProject.bin 11264 bytes

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