Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 24a4117609f9714e…

MALICIOUS

Office (OOXML)

41.6 KB Created: 2021-06-22 12:43:05 UTC Authoring application: Microsoft Excel 16.0300
MD5: ff7c79986f17955f4511ef60c5ab250c SHA-1: 1a041343195f05ae90426e88ca1e669f562db223 SHA-256: 24a4117609f9714eb2eda9345251b46ab5ae01edeb537972b1c5ea23677f35b5
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
b370aa7b14216ded2cb9e766f630429d26aca7190f8a9c4333ce19d04e460cee		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 35036 bytes
vbaProject_00.bin
bcebf6f00d0f351cae0fe1c6f28411a24530dd99f7ce70b6b6e3820c715900c5		 vba-project OOXML VBA project: xl/vbaProject.bin 11264 bytes

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