Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 74691888665ecc8a…

MALICIOUS

Office (OOXML)

41.6 KB Created: 2021-06-22 12:43:05 UTC Authoring application: Microsoft Excel 16.0300
MD5: a6daf4e1722890134e289523b7c4e98d SHA-1: 2b987fcbeb037e18d159770d4ba21fda2638c3a4 SHA-256: 74691888665ecc8acb87b97441d5237c977838972cae8ce60eacb9e34bbf3562
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 macro further supports the hypothesis that it decodes and executes a malicious payload, likely a downloader.

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
ee7a426f535446ed0a83ae722db01269b4236f147cbf29fd297200b9e97306ef		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 35036 bytes
vbaProject_00.bin
482f3656b11fc01566e401b9d17b66bcaec1abccc48a3207888293cdffec2421		 vba-project OOXML VBA project: xl/vbaProject.bin 11264 bytes

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