Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 b38c450392b2b32b…

MALICIOUS

Office (OOXML)

41.6 KB Created: 2021-06-22 12:43:05 UTC Authoring application: Microsoft Excel 16.0300
MD5: ca8475a017566651cc7cdb38214f4b74 SHA-1: ac1285a24f9e653fb986089bd8a249dc70f57059 SHA-256: b38c450392b2b32b6abce4243b75e80b451078525fd5e89ed285afb2344752bd
160 Risk Score

Malware Insights

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

The critical heuristic 'OLE_VBA_PS: PowerShell reference in VBA' indicates that the VBA macros within this Excel document are designed to execute PowerShell commands. The 'OLE_VBA_CMD: cmd.exe reference in VBA' heuristic further suggests the use of the command interpreter. The 'GetObject call' heuristic implies an attempt to load and execute external code or objects. These combined findings strongly suggest the document's purpose is to act as a downloader for a secondary malicious payload, likely executed via PowerShell.

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
3886137c629026c77d28f7e45ee3f60884c7b44a6cf2fc02beb67f200967d267		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 35036 bytes
vbaProject_00.bin
51c5bc979ec463a165ac27c1e97cf28e0f901cc58603b566fc9b709565a7c060		 vba-project OOXML VBA project: xl/vbaProject.bin 11264 bytes

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