Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 c466195c6748aace…

MALICIOUS

Office (OOXML)

41.6 KB Created: 2021-06-22 12:43:05 UTC Authoring application: Microsoft Excel 16.0300
MD5: ce769e4d8c9f8664891908fb7d841baf SHA-1: 888a9917567e2bd88805c5a8f98abc347929391a SHA-256: c466195c6748aace6b8f403f80a5c0d4bdd60978425051b0e85fac87c9e5bd25
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 GetObject call further suggests the potential for object manipulation or execution of external code. The VBA code includes a Base64 decoding function, likely used to obfuscate the actual commands being executed, which are probably designed to download and run 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
6c36c4bce549b6441841ac591c61f28502bff0c62b4997b7b576e5b4483aef71		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 35036 bytes
vbaProject_00.bin
524a3d921c1b920bb351a37ef67c62bdbca8ca6708cea917a6b41cb8050d574b		 vba-project OOXML VBA project: xl/vbaProject.bin 11264 bytes

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