Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 ad52af43357612a0…

MALICIOUS

Office (OOXML)

41.6 KB Created: 2021-06-22 12:43:05 UTC Authoring application: Microsoft Excel 16.0300
MD5: 69677f588cc46bdc5a16217cdc87a871 SHA-1: d8a5e4cdc0ec256408bbf3501ba2446857b86121 SHA-256: ad52af43357612a03976240e2e6cb3978d4b249df2923e697a49f17fa41f6c80
160 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1059.005 Visual Basic T1059.003 Windows Command Shell

The file is an Office document containing VBA macros. Heuristics indicate the VBA code references PowerShell and cmd.exe, and uses GetObject. The VBA macro itself contains obfuscated code, including a Base64 decoding function, suggesting it is designed to download and execute a second-stage payload. The specific commands and URLs are not directly visible due to obfuscation.

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
5db79067992ceda1c64aaaba8bc1071974c0e8ebfa06eebb7efba7562759b579		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 35036 bytes
vbaProject_00.bin
e0f0898e030f237f216df41f5cc115af4d94211e0aaf6143cec96c15a9f2b9af		 vba-project OOXML VBA project: xl/vbaProject.bin 11264 bytes

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