Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 6ca6c894a3538be8…

MALICIOUS

Office (OOXML)

41.6 KB Created: 2021-06-22 12:43:05 UTC Authoring application: Microsoft Excel 16.0300
MD5: 03ea6ee2b0353718aa90beb04dd7937d SHA-1: 67d284a0afcd765c9c2284969b408b123caaf1ec SHA-256: 6ca6c894a3538be8693dfa4be37b57ab05fab633d70285e7ea806ea41fd24e26
160 Risk Score

Malware Insights

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

The file is an Office document containing VBA macros. Heuristics indicate the VBA code references PowerShell and cmd.exe, and uses GetObject, suggesting it's designed to execute external commands. The presence of a Base64 decoding function within the VBA code points towards obfuscation, likely to conceal a payload download and execution routine. The specific obfuscation technique and lack of direct URL or hash prevent a higher confidence score or specific family attribution.

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
92fbe001338039dcbc005c9a8e0c9bdbe041b31c4a3ed496a8de81452607bfaa		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 35036 bytes
vbaProject_00.bin
2a4298a584fbcfd221591bec6beb09db35b53758b2b93f24069e778d60feb56c		 vba-project OOXML VBA project: xl/vbaProject.bin 11264 bytes

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