Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 5ab6ea8ec776fec4…

MALICIOUS

Office (OOXML)

41.5 KB Created: 2021-06-22 12:43:05 UTC Authoring application: Microsoft Excel 16.0300
MD5: 3ed89e48290aa292d77e77562f756270 SHA-1: 41446156b7edc490ce1537f96f702175ca2b240a SHA-256: 5ab6ea8ec776fec4c3b48879e715bcc5bdd24c713e89085de7a8d564802cd488
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 OOXML file contains VBA macros that reference PowerShell and cmd.exe. The GetObject call and the presence of a VBA project indicate macro execution. The VBA code appears to be obfuscated, but its intent is likely to download and execute a second-stage payload, as suggested by the critical heuristic firing for PowerShell references. No specific family could be identified due to the obfuscation and lack of further indicators.

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
366b8c4295c49c3322e67374d335e2d3659ab462b40d4545225c9275ecc693c2		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 34430 bytes
vbaProject_00.bin
f5783405eb30eee3b338800ffe5ebe4a9db2002a900c6a4d48396cc3b979bbd4		 vba-project OOXML VBA project: xl/vbaProject.bin 11264 bytes

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