Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 8954828f59713e0c…

MALICIOUS

Office (OOXML)

41.6 KB Created: 2021-06-22 12:43:05 UTC Authoring application: Microsoft Excel 16.0300
MD5: 93debfe04bfe4ada97d574db7c2b9ca7 SHA-1: e585445aa9dd20416b93bde1a7c3b16c9f75f02e SHA-256: 8954828f59713e0ce63488f2d10ab6142d14d9e6466aeb02a9ec8285ee83c712
160 Risk Score

Malware Insights

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

The file is an Office document containing VBA macros. Heuristics indicate the presence of PowerShell and cmd.exe references within the VBA code, suggesting an attempt to execute external commands. The VBA code itself appears to be heavily obfuscated, but the presence of these references strongly implies a downloader or dropper functionality. The document is likely delivered as a spearphishing attachment.

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
84449ceaf777483a078b6438e395ee00276f3f1980e7d35bcb834d5f0186b999		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 35036 bytes
vbaProject_00.bin
0b982c80bd014afd39ed49bdf0a1fbaca44bfa2aa431b384dc69f99e236afcac		 vba-project OOXML VBA project: xl/vbaProject.bin 11264 bytes

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