Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 655c7308c5f1b9d6…

MALICIOUS

Office (OOXML)

41.7 KB Created: 2021-06-22 12:43:05 UTC Authoring application: Microsoft Excel 16.0300
MD5: 9713e2dd294ff31d94fc05049981d2b7 SHA-1: 016577a28108267d6135d4c109703129210b2fd9 SHA-256: 655c7308c5f1b9d69198e0798f7ab531fb84513059f5f2f41561785210b85d63
160 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1059.001 PowerShell T1059.003 Windows Command Shell T1204.002 Malicious File

The OOXML file contains VBA macros that reference cmd.exe and PowerShell. The GetObject call and the presence of VBA macros suggest an attempt to execute arbitrary code. The VBA code includes a Base64 decoding function, indicating obfuscation, and likely serves to download and execute a secondary payload. The specific obfuscation and lack of direct URL or executable content prevent a more precise 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
4e5b13bc197cb9f01b82d8625e3db4453a60d95eadc37422404b3ded8180f085		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 34430 bytes
vbaProject_00.bin
0cb10138c16342d99d22385862b73e5d43f70c040acf7bbae516b30e72c51a59		 vba-project OOXML VBA project: xl/vbaProject.bin 11264 bytes

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