Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 93bec671886d1b3f…

MALICIOUS

Office (OOXML)

41.6 KB Created: 2021-06-22 12:43:05 UTC Authoring application: Microsoft Excel 16.0300
MD5: 338b2133e33ff625fc14c556f019d1ee SHA-1: 09955c7f6b1c523db62e20f541d1cc920c683ad4 SHA-256: 93bec671886d1b3f1d7216b76eb5458da808b8d66894a5f41de717e83267d703
160 Risk Score

Malware Insights

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

This Excel document contains VBA macros that reference PowerShell and cmd.exe, indicating an attempt to execute arbitrary commands. The presence of a Decode64 function suggests obfuscation, commonly used to hide malicious payloads. The macros likely download and execute a secondary payload, a common tactic for initial access via spearphishing attachments.

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
40903d6d8103cdd247e3a466ecc82360726a4428abcf83397c6a4882c389168b		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 35036 bytes
vbaProject_00.bin
87a406c48e65bba1bdb229abf6915f21015d2280290158292c1702fa0c81cea7		 vba-project OOXML VBA project: xl/vbaProject.bin 11264 bytes

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