Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 afb3c2b3cf43ed6c…

MALICIOUS

Office (OOXML)

41.6 KB Created: 2021-06-22 12:43:05 UTC Authoring application: Microsoft Excel 16.0300
MD5: e8ee952a2bf732e7b18c4848286709c5 SHA-1: 402ea8b5a5db2e3c5e5664e2bc08418baf50f95c SHA-256: afb3c2b3cf43ed6cded323eb145a3230648f83f40a29a5787f99782fba8526e6
160 Risk Score

Malware Insights

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

The critical heuristic 'OLE_VBA_PS' indicates a PowerShell reference within the VBA macros. Additionally, 'OLE_VBA_CMD' and 'OLE_VBA_GETOBJ' suggest the VBA code is attempting to execute external commands and potentially load objects. The presence of VBA macros and these specific heuristic firings strongly suggest the document is designed to download and execute a secondary payload, a common technique for malware delivery.

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
8308c2c360a4e3ba414c5e8078ca6c8a63bf9bd663bb555644f773dbe14474ec		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 35036 bytes
vbaProject_00.bin
224fad84faf75adfa25bfbbfec3d2d694e9cfa0bc26a1db31d7de32824354918		 vba-project OOXML VBA project: xl/vbaProject.bin 11264 bytes

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