Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 85bee8222e446a50…

MALICIOUS

Office (OOXML)

41.6 KB Created: 2021-06-22 12:43:05 UTC Authoring application: Microsoft Excel 16.0300
MD5: d7158fe2e2a9978555da58313a6fa8b1 SHA-1: 89b2e8e1cd9c633aca1c98f3b01818f1f1457017 SHA-256: 85bee8222e446a50dfb8af44295bf4e39e65cbcc45362a977d13f84abf7226ec
160 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1059.003 Windows Command Shell T1566.001 Spearphishing Attachment

The OOXML file contains VBA macros that reference PowerShell and cmd.exe, indicating an attempt to execute arbitrary commands. The presence of a GetObject call further suggests the potential for object manipulation or execution of external code. The VBA code includes a Base64 decoding function, which is commonly used to obfuscate malicious payloads.

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
8b13de871e3da639eaca2f2e3a253520f5184822acc3b5e2df78dd8f1a76b2f7		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 35036 bytes
vbaProject_00.bin
5332cbb358e987af025afaf657b83853427d62f5a1fbe245417a29e1fd861371		 vba-project OOXML VBA project: xl/vbaProject.bin 11264 bytes

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