Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 17ddbe1ede2db811…

MALICIOUS

Office (OOXML)

41.6 KB Created: 2021-06-22 12:43:05 UTC Authoring application: Microsoft Excel 16.0300
MD5: 4641a27b070b5fa20badb0a6fe5e6e8c SHA-1: fd94e095b7eeb4ca7499b4acd66da3fbec51fbf4 SHA-256: 17ddbe1ede2db811b02ca1d6ab47d5aa3f9495b1ca525d59dce6b3d436c87b47
160 Risk Score

Malware Insights

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

The file is an Office document containing VBA macros. Heuristics indicate the VBA code references PowerShell and cmd.exe, and uses GetObject, suggesting it's designed to execute external commands. The presence of a Decode64 function in the VBA script implies obfuscation, likely to download and execute a secondary payload. The specific obfuscation and execution methods point towards a downloader or dropper malware.

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
51287a36b14f210fb50e713713034349a4106b146a7f2a44e206fb53e5b903b0		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 35036 bytes
vbaProject_00.bin
f44bcb7b918f74ba62ef218ca2c6d4f3b10c8c3c0123a82ba1cf12dc9b03b665		 vba-project OOXML VBA project: xl/vbaProject.bin 11264 bytes

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