Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 5af55146b4cf40db…

MALICIOUS

Office (OOXML)

41.5 KB Created: 2021-06-22 12:43:05 UTC Authoring application: Microsoft Excel 16.0300
MD5: 29d4f8c14913fba7477bcd881ea11fff SHA-1: 9a6ba64368971a9316ef2f0b74bd5a8f555e14e6 SHA-256: 5af55146b4cf40db0e48aa3dc255585f16ae7259179a6e36aeed4364d2f511e5
160 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1059.001 PowerShell 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 suggest the execution of malicious code. The VBA macro itself appears to be a Base64 decoder, likely used to obfuscate a payload that is subsequently executed via PowerShell.

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
c494ce30057dcfb2152a9fd88cee5488be1758a2e388d264e4037bfe122beba0		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 34430 bytes
vbaProject_00.bin
f0469c88168e69839bf4bc6feaa7b7a11a2a20d0bb494ee303620b7d50a58a80		 vba-project OOXML VBA project: xl/vbaProject.bin 11264 bytes

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