Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 6e3c00865eb595b2…

MALICIOUS

Office (OOXML)

11.0 KB Created: 2015-06-05 18:19:34 UTC Authoring application: Microsoft Excel 16.0300
MD5: 7c0dde4e9d33135b02e699afee1e2a94 SHA-1: 9fd197d95248715dfdf5e73f99cb2c63d8de9e33 SHA-256: 6e3c00865eb595b2d2f3223c55d82c8718efba69a421cf7d3d274ec6e156cba9
220 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1059.001 PowerShell T1566.001 Spearphishing Attachment

The sample is an OOXML document containing a VBA macro with an Auto_Open subroutine. This subroutine directly calls the 'powershell ' command, indicating an attempt to execute a PowerShell payload. This is a common technique for downloading and executing further malicious content.

Heuristics 5

  • Shell() call in VBA critical OLE_VBA_SHELL
    Shell() call in VBA
  • PowerShell reference in VBA critical OLE_VBA_PS
    PowerShell reference in VBA
  • Auto_Open macro high OLE_VBA_AUTO
    Auto_Open macro
  • VBA p-code auto-exec with execution tokens high OLE_VBA_PCODE_AUTOEXEC_EXEC
    Compiled VBA/cache stream contains an auto-execution token together with shell/download/object-execution tokens. This catches p-code-only or source-extraction-failure macro documents where visible source is unavailable.
  • 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
85284f3979b9daf9bcb70b8f7c073ef1770550e25034768495fb01515ab70284		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 714 bytes
vbaProject_00.bin
e886cad202e9ac8adef942b83198d5fc26720907e68e1c5b04a44039f590bf1f		 vba-project OOXML VBA project: xl/vbaProject.bin 10240 bytes

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