Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 538c0eb561197714…

MALICIOUS

Office (OOXML)

41.6 KB Created: 2021-06-22 12:43:05 UTC Authoring application: Microsoft Excel 16.0300
MD5: a4a102263b19568d649b5e6d543a1805 SHA-1: a5eb1715f70d5e0208d29bf73914f22845f35269 SHA-256: 538c0eb5611977143a623a89f368481c6660b89a66fe5556e4169fad1342d49f
160 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1059.003 Windows Command Shell T1566.001 Spearphishing Attachment

The Excel file contains VBA macros that reference PowerShell and cmd.exe. The GetObject call and the presence of VBA macros suggest an attempt to execute malicious code. The VBA code appears to be heavily obfuscated, making it difficult to determine the exact payload, but the overall pattern indicates a downloader or dropper.

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
2331c6092f24001ed74aaa43a627d9957d57fe1674898cb1b3de4c431581ae55		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 35036 bytes
vbaProject_00.bin
e9ec8b1691f7748402388c2b6f3ee6189c6cd0cc312010e259749126ee1973fa		 vba-project OOXML VBA project: xl/vbaProject.bin 11264 bytes

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