Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 2fe3120085d7cf4b…

MALICIOUS

Office (OOXML)

41.7 KB Created: 2021-06-22 12:43:05 UTC Authoring application: Microsoft Excel 16.0300
MD5: c1ec16f09fcb5322dc268243f71eeed6 SHA-1: fe531a996abc47ac52990ab1544f1e9375d224b7 SHA-256: 2fe3120085d7cf4bd8e01553cf6a0aa20048b297f33b882367d4108347aef283
160 Risk Score

Malware Insights

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

The critical heuristic 'OLE_VBA_PS' indicates a PowerShell reference within the VBA macros, and high heuristics 'OLE_VBA_GETOBJ' and 'OLE_VBA_CMD' suggest the use of GetObject and cmd.exe. This points to a macro-based execution chain designed to download and run additional malicious content. The VBA code itself appears to be obfuscated, making a precise determination of the final payload difficult.

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
050336bfb1fe316d026ffaf2c95016d302c5ef0764494171daf098d5b3cabad3		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 35036 bytes
vbaProject_00.bin
bab501945666005cb687b1496df66f4c128e9ccceb4bd36f53a5989d82b5d31d		 vba-project OOXML VBA project: xl/vbaProject.bin 11264 bytes

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