Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 87854968d86417ba…

MALICIOUS

Office (OOXML)

42.0 KB Created: 2021-06-22 12:43:05 UTC Authoring application: Microsoft Excel 16.0300
MD5: 365912c7352bccde357371dffc7be0b7 SHA-1: 80bcdd3d0673a2778c17a3d80de458e4803f19bc SHA-256: 87854968d86417ba37d645243ab4cd5e512fb5c3f54d1b87b66cb086d52758a6
260 Risk Score

Malware Insights

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

This OOXML document contains a Workbook_Open macro that references cmd.exe and PowerShell. The critical heuristic indicates the VBA code uses WMI to launch a process, likely to execute a downloaded payload. The macro also contains Base64 decoding logic, suggesting it's used to obfuscate malicious commands or URLs.

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
1cd2979cf95e38948388eff5014a89765fe9eaa2bb139338c1e10aef145d6b98		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 35868 bytes
vbaProject_00.bin
952c9ab724bdbb68c129ba64459e2cf796fb27cf7a0d58c08a0ce5bcaae47b6f		 vba-project OOXML VBA project: xl/vbaProject.bin 11776 bytes

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