Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 98dfa8feab7764ee…

MALICIOUS

Office (OOXML)

41.6 KB Created: 2021-06-22 12:43:05 UTC Authoring application: Microsoft Excel 16.0300
MD5: df1b2c9174e5edcf2125c2182bf3607d SHA-1: 631ff16ca90af7fbe4648d168f30e02a6c1a68f8 SHA-256: 98dfa8feab7764ee3f5527005898915acbbc8696ae14c6196d9fc6c4e384b3c2
160 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1059.001 PowerShell T1204.002 Malicious File

The OOXML 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 includes a Base64 decoding function, indicating that it likely decodes and executes a payload, possibly downloaded from a remote source.

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
d5a464e29bd5194577f194daa05f5092f6b3744488869b1a1fe04f7dbb922dec		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 35036 bytes
vbaProject_00.bin
feb89280584e0355e6439036efcd346871ca68397f0fc224d2da0bf09bb0618c		 vba-project OOXML VBA project: xl/vbaProject.bin 11264 bytes

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