Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 ded896f8682d1f4f…

MALICIOUS

Office (OOXML)

41.6 KB Created: 2021-06-22 12:43:05 UTC Authoring application: Microsoft Excel 16.0300
MD5: ad455b4d94db886962dba0fba5cd52fc SHA-1: c8324170098972914bcbc3d0f90d09d5aa578f53 SHA-256: ded896f8682d1f4f790e5d3ba038b1a0f4b5f6a15f4a4720b4cc5906eb5ba0b9
160 Risk Score

Malware Insights

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

The file is an OOXML document containing VBA macros. Heuristics indicate references to PowerShell and cmd.exe within the VBA code, suggesting an attempt to execute external commands. The VBA code itself appears to be obfuscated, with a function named 'Decode64' which likely decodes and executes a payload. The presence of these elements strongly suggests the document is designed to download and run a second-stage malicious component.

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
24084c5d141b168e2e7b7f1f65b5c30dfb1afe30eb8deb7bcc179e58eb76f354		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 35036 bytes
vbaProject_00.bin
3b4d48cdc16d91c14da8f1d5adf1675a54a28f63c4a4dac7dfad77284e5284ab		 vba-project OOXML VBA project: xl/vbaProject.bin 11264 bytes

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