Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 f5ca96d53c8b6638…

MALICIOUS

Office (OOXML)

41.5 KB Created: 2021-06-22 12:43:05 UTC Authoring application: Microsoft Excel 16.0300
MD5: d4a5e0ebdc9be0e15b8330596fcc2290 SHA-1: b3c923f94a73bde8cadd8c003fc6a5fc5242bc83 SHA-256: f5ca96d53c8b6638bd8dd3c5bc24f73d254b914eba9114fab5f45a2fb96f5cee
160 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1059.001 PowerShell T1204.002 Malicious File

The file is an OOXML document containing VBA macros. Heuristics indicate the presence of VBA macros, a reference to PowerShell, and calls to GetObject and cmd.exe. The VBA code appears to be obfuscated and includes a Base64 decoding function, suggesting it is used to execute a malicious payload. The primary function of the script is likely to download and execute a secondary payload via PowerShell.

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
2a9b8214e62f5c39626aeb9a4439c8a42839f416fbea57a0e062c3f4ee4cc4fe		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 34430 bytes
vbaProject_00.bin
b4ca461fc759fe78da4961c25a8db44f3d4cd174236436abb4ffac3c1bdf6879		 vba-project OOXML VBA project: xl/vbaProject.bin 11264 bytes

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