Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 a8634a632552d830…

MALICIOUS

Office (OOXML)

41.5 KB Created: 2021-06-22 12:43:05 UTC Authoring application: Microsoft Excel 16.0300
MD5: 65b9015e1acf0a1ad9b2fc5b1069070b SHA-1: 4158ccbee78619b6b320e8d84ad8ec8cdcb3a871 SHA-256: a8634a632552d8307707ad470603028258a1b8eb7c80c60c244126018c2aa74d
160 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1059.001 PowerShell T1059.003 Windows Command Shell

The OOXML document contains VBA macros that reference PowerShell and cmd.exe. The GetObject call and the presence of a Base64 decoding function suggest the macro is designed to download and execute a secondary payload. The VBA code is heavily obfuscated, making it difficult to determine the exact execution flow or identify specific IOCs.

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
bf83dce71e7806afe297a9b3baf90942bbb0d019e5b9e2639bc97a68a6e0c4e4		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 34430 bytes
vbaProject_00.bin
d2c94bfc56a73ab5c3b9ee96ec85bfaa818b0251c229b51d6d44006f4c2dd294		 vba-project OOXML VBA project: xl/vbaProject.bin 11264 bytes

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