Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 cc923c17fd17f7f4…

MALICIOUS

Office (OOXML)

42.0 KB Created: 2021-06-22 12:43:05 UTC Authoring application: Microsoft Excel 16.0300
MD5: a011464f7cd5b037f16fde0474e6d3d6 SHA-1: e1319168bd8f289e0f8514761ba04fb145941550 SHA-256: cc923c17fd17f7f46f29f351ecbe0a365e575e4e6f25b04dcff7e514d20a6ec6
260 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1059.001 PowerShell T1218.011 System Binary Proxy Execution: Rundll32 T1059.003 Windows Command Shell

This Excel document contains VBA macros that are triggered by the Workbook_Open event. The macros reference cmd.exe and PowerShell, indicating an attempt to execute commands. Specifically, the GetObject call with 'winmgmts:\\.\root\cimv2:Win32_Process' suggests the creation of a new process, likely to download and execute a secondary payload. The presence of a Base64 decoding function within the VBA code further supports the idea of obfuscated malicious code execution.

Heuristics 6

  • PowerShell reference in VBA critical OLE_VBA_PS
    PowerShell reference in VBA
  • VBA WMI Win32_Process launcher critical OLE_VBA_WMI_PROCESS_CREATE
    VBA macro builds or references a WMI moniker for Win32_Process and invokes .Create to start a command. This is a high-confidence macro execution chain that often hides the WMI class name through string concatenation or helper functions.
  • Workbook_Open macro high OLE_VBA_WBOPEN
    Workbook_Open macro
  • 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
690c1fe3af5cb1a9b471f4c6f0a3bf6f037442bc4351b9dc4f2fda8d0f03f2d0		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 35825 bytes
vbaProject_00.bin
6555db23ccb5d71ba37b00c94786cb7e6a644e247334d2879cd55a131bc602cb		 vba-project OOXML VBA project: xl/vbaProject.bin 11776 bytes

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