Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 28b2122d645eff2e…

MALICIOUS

Office (OOXML)

41.5 KB Created: 2021-06-22 12:43:05 UTC Authoring application: Microsoft Excel 16.0300
MD5: 28f347de40a5b74c0b366cac12d788ea SHA-1: ecbc92dba48aa2b26d09a0171a08fbec522a2fe1 SHA-256: 28b2122d645eff2edff1eb8a292a64ce56841efddbd0772812084299135f6bf3
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 document contains VBA macros that reference cmd.exe and PowerShell. The GetObject call and the presence of a Base64 decoding function suggest that the macro is designed to download and execute a secondary payload. The specific obfuscation and decoding routine make it difficult to determine the exact payload or family without further dynamic analysis.

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
0147ecb7e6160816c00ce944ee3d0d94eb33e57d3389cc04353baea118100366		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 34430 bytes
vbaProject_00.bin
d0e6c901f5ca299e564743bcd9bad416356a926b25e4307769659254e5bea8bf		 vba-project OOXML VBA project: xl/vbaProject.bin 11264 bytes

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