Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 70e3afb2a6511c71…

MALICIOUS

Office (OOXML)

41.6 KB Created: 2021-06-22 12:43:05 UTC Authoring application: Microsoft Excel 16.0300
MD5: 9697fd543f41e1226e19bec484dd87b3 SHA-1: 89b073d58ff6fe79ec37469d73839e063dbc8a6f SHA-256: 70e3afb2a6511c7188294b00ba488cc596f69aea1a08563ce45ada6322c72451
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 presence of PowerShell and cmd.exe references within the VBA code, suggesting an attempt to execute external commands. The GetObject call further supports the likelihood of payload execution or retrieval. Given these findings, the primary attack pattern is likely spearphishing attachment, with the VBA macros serving as the execution mechanism for a secondary payload.

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
592ab52261858321664cd717e62273ae84dad808e9b27494cabcd4e4405c32af		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 35036 bytes
vbaProject_00.bin
e46f3771a287ac6596a509e6604408d8502198f15c6485533f657d6c8200ba1b		 vba-project OOXML VBA project: xl/vbaProject.bin 11264 bytes

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