Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 cc2199bd09ffc5c8…

MALICIOUS

Office (OOXML)

41.6 KB Created: 2021-06-22 12:43:05 UTC Authoring application: Microsoft Excel 16.0300
MD5: bf27820b3b78dcd07b1f7ddcd0ac4d26 SHA-1: a86113183c56eb84b25150120bdbc0a115840112 SHA-256: cc2199bd09ffc5c87ccaeca76a40aca5f3b88fbe85dc8811a2171022c7e726c6
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 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 appears to be heavily obfuscated, but its likely purpose is to download and execute a second-stage payload. The presence of these indicators suggests a macro-based 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
767d2240d94b9c4291358c052b21a9e303691f11f1479a364e0fc64f35403528		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 35036 bytes
vbaProject_00.bin
3b5d25d106f8a91070f1ca5d76cadd51645b14712d5c76f03928c15dfc6d48e9		 vba-project OOXML VBA project: xl/vbaProject.bin 11264 bytes

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