Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 1498722f4e7e7177…

MALICIOUS

Office (OOXML)

41.6 KB Created: 2021-06-22 12:43:05 UTC Authoring application: Microsoft Excel 16.0300
MD5: 2565755471a4c7c99f43fce31af980ee SHA-1: 57b02782ef4de1fcea45baabcf55281d199e39de SHA-256: 1498722f4e7e71775986f4907dccc05a4dd3275ca5c9267c177ced388654d995
160 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1059.001 PowerShell T1059.003 Windows Command Shell

This OOXML document contains VBA macros that reference PowerShell and cmd.exe. The GetObject call and the presence of a Base64 decoding function suggest the macro is designed to download and execute a malicious payload. The specific obfuscation and lack of clear URLs prevent definitive 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
9c3b7540eabca57c973ad1f986e22ef1ccf10272a8c8aa8392eb56bdaf7a8f4e		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 35036 bytes
vbaProject_00.bin
ae6da55693b0f2e0f61d613f5a03f43a0cdc377ee47eedcf7ff0e6c9b2d30c9e		 vba-project OOXML VBA project: xl/vbaProject.bin 11264 bytes

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