Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 16964ef9683f8f3b…

MALICIOUS

Office (OOXML)

41.5 KB Created: 2021-06-22 12:43:05 UTC Authoring application: Microsoft Excel 16.0300
MD5: 0c0507ef81f4dddec2a1ad23a1be62ac SHA-1: 8f3bf086d35cf2c1af3a829f89f8ac78a6844071 SHA-256: 16964ef9683f8f3b349b4d15e322e98453e5ad9ff1625eee093098d0f669945a
160 Risk Score

Malware Insights

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

This 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 a more precise family attribution.

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
4719280b1fafc659c4cb7d62f670af6ddb17870c8f32781023d9747a68ee1ba6		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 34430 bytes
vbaProject_00.bin
d6aa7966b94802461a0a68c320334e66c250346ac12991df9856e4107c946ad7		 vba-project OOXML VBA project: xl/vbaProject.bin 11264 bytes

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