Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 1f05c865b7011429…

MALICIOUS

Office (OOXML)

41.5 KB Created: 2021-06-22 12:43:05 UTC Authoring application: Microsoft Excel 16.0300
MD5: 24ce1a44cf88a38039b0f7bf2afaa659 SHA-1: 3d32609f1be5a4d584e16c60e3d2d2655bd8fa68 SHA-256: 1f05c865b70114293cd67317db80d92883ab4ac88aeff055f04211563f5fd90f
160 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1059.001 PowerShell T1059.003 Windows Command Shell T1204.002 Malicious File

The VBA macros within this Excel document contain references to cmd.exe and PowerShell, indicating an attempt to execute commands. The GetObject call further suggests the potential for object manipulation or execution of external code. These combined heuristics strongly suggest the macro 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
1f935ea1d3d4d4696e8c3cb285a707e6a76af615e623a638a16f831bff61379c		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 34430 bytes
vbaProject_00.bin
39f3637ae5301409a817ec993423d36ba883bf53ea0ed8fb9a40d8947616da5c		 vba-project OOXML VBA project: xl/vbaProject.bin 11264 bytes

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