Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 de26da603c094d3b…

MALICIOUS

Office (OOXML)

41.8 KB Created: 2021-06-22 12:43:05 UTC Authoring application: Microsoft Excel 16.0300
MD5: 20b86fa14c238d0fd6ba564781fad137 SHA-1: 3ab9ba0f87df1f3cf50bacd1f00af07e5e0bc7df SHA-256: de26da603c094d3b93df16d3fd1e4db45913924f8a617ea64ece93cd402ab409
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 OOXML file contains VBA macros that reference PowerShell and cmd.exe. The critical heuristic indicates a PowerShell reference within the VBA, and high heuristics point to GetObject and cmd.exe calls. The VBA code appears to be obfuscated, but its likely intent is to download and execute a second-stage payload. The presence of these elements strongly suggests a malicious macro downloader.

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
b475d9d5752a09a09450c8f106775c7765ba180d06819fd6552e950b4b525701		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 34430 bytes
vbaProject_00.bin
4850245c32f690237a5c54b44fc9d612a2656d013332f050d1c84ee42f4d0f8c		 vba-project OOXML VBA project: xl/vbaProject.bin 11264 bytes

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