Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 43ec6cecbcab4f35…

MALICIOUS

Office (OOXML)

68.4 KB Created: 2012-10-19 22:33:57 UTC Authoring application: Microsoft Excel 12.0000
MD5: c14e41d0d4fc69e71d397d8dbe6fa8f4 SHA-1: b8bdc495250f03bf83c9a7234f1691505666d624 SHA-256: 43ec6cecbcab4f356d1a4f50da5a9dcd54d978568b09b9218bb0c3a88b37abdf
208 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1547.001 Registry Run Keys / Startup Folder

This Excel document contains a Workbook_Open VBA macro that is designed to execute malicious code. The macro attempts to create a scheduled task using the 'Schedule.Service' COM object and writes a file named 'qListDataTypeChoice.xsl' to the ALLUSERSPROFILE directory. This indicates the sample is likely a downloader or dropper for a second-stage payload.

Heuristics 6

  • LOLBin reference in VBA critical OLE_VBA_LOLBIN
    LOLBin reference in VBA
  • Workbook_Open macro high OLE_VBA_WBOPEN
    Workbook_Open macro
  • CreateObject call high OLE_VBA_CREATEOBJ
    CreateObject call
  • 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
  • Environ() call (env variable access) low OLE_VBA_ENVIRON
    Environ() call (env variable access)

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
55f585c084c264ce351f1b7b95c6a2b23f3ef2dcbc744abc7dc16498dbd759fd		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 3862 bytes
vbaProject_00.bin
4bc779b934c04279ad5c5aaa6b81e449665efb701766c69314e166079e0cef4b		 vba-project OOXML VBA project: xl/vbaProject.bin 16896 bytes

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