Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 7732b62719fba6df…

MALICIOUS

Office (OOXML)

41.6 KB Created: 2021-06-22 12:43:05 UTC Authoring application: Microsoft Excel 16.0300
MD5: 63efdc9c915a75037541b508bbdb9639 SHA-1: d0b89e87e5e02491184d0f0d6557758b6c0177bb SHA-256: 7732b62719fba6dffff9e30f544894629d87ccc645474a47b9f0a49c05345bf7
160 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1059.005 Visual Basic T1566.001 Spearphishing Attachment

This Excel document contains VBA macros that reference cmd.exe and PowerShell. The GetObject call and the presence of VBA macros suggest an attempt to execute arbitrary code. The VBA code itself appears to be heavily obfuscated, but the presence of PowerShell and cmd.exe references indicates a likely intent to download and execute a secondary payload. No specific family could be identified due to the 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
c8ddc1a9bcbabaeece5f4c33e64333d1bf6de27e9c717a2a1f7333f708af1d49		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 35036 bytes
vbaProject_00.bin
a4c4aabeb5df09b25733034e56b764df54d26eed3504dd4502ae05fdb24fad0e		 vba-project OOXML VBA project: xl/vbaProject.bin 11264 bytes

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