Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 a23913b676a9c6a0…

MALICIOUS

Office (OOXML)

16.0 KB Created: 2015-06-05 18:19:34 UTC Authoring application: Microsoft Excel 16.0300
MD5: b09a54237f4a4748117e1934c18d9a1f SHA-1: 32c393821f4303814d1150025211c80e5da6c9a4 SHA-256: a23913b676a9c6a0dc0df836b07d3bd6b583e5d633c6b56805bd99eac488c279
302 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1059.003 Windows Command Shell T1204.002 Malicious File T1105 Ingress Tool Transfer

The sample contains a Workbook_Open VBA macro that executes a complex command. This command first creates a VBScript file in the temporary directory, which then uses `wget` and `powershell` to download a second-stage VBScript payload (`rrr.vbe`) from `http://120.77.150.225:8055/rrr.vbe`. The downloaded payload is then executed. The document body, a fake vaccine registration form, serves as a lure.

Heuristics 8

  • Shell() call in VBA critical OLE_VBA_SHELL
    Shell() call in VBA
  • PowerShell reference in VBA critical OLE_VBA_PS
    PowerShell reference in VBA
  • Workbook_Open macro high OLE_VBA_WBOPEN
    Workbook_Open macro
  • CreateObject call high OLE_VBA_CREATEOBJ
    CreateObject call
  • cmd.exe reference in VBA high OLE_VBA_CMD
    cmd.exe reference in VBA
  • 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
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://120.77.150.225:8055/rrr.vbe

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
62eea18ebf0f67dd694b6b73c2b6968852886ac67f8ee4c60271676badcb8920		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 1144 bytes
vbaProject_00.bin
56b34c125fd972aff96a538fdff557b8465bca0c75bb80ab037cf584e2132141		 vba-project OOXML VBA project: xl/vbaProject.bin 9728 bytes

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