Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 7cdddce51ce4150c…

MALICIOUS

Office (OOXML)

14.5 KB
MD5: 6ccee1577e173df379620a9c11766cf5 SHA-1: 35920e6330ac39acfca64ab9e8ea47528dd12827 SHA-256: 7cdddce51ce4150c7988e8ef8521c515233c15df2a0eb4e4d848112a065dad04
140 Risk Score

Malware Insights

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

The OOXML document contains a VBA macro with an Auto_Open subroutine. This macro references cmd.exe and constructs a URL by concatenating 'https://www.' with 'bitly.com/adsklklsa', indicating an intent to download and execute a second-stage payload. The VBA project part was also renamed to evade detection.

Heuristics 4

  • VBA project part renamed to evade filename detection high OOXML_VBA_PROJECT_RENAMED
    The VBA project is bound through the OOXML relationship/content type but its part is not named vbaProject.bin. Legitimate Office producers always emit vbaProject.bin; renaming it hides the macros from path-only scanners (observed in the SVCReady loader).
  • Auto_Open macro high OLE_VBA_AUTO
    Auto_Open macro
  • 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 (project part renamed away from vbaProject.bin: ppt/kasdokaosdk.b)

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
3c225005517a270c72290d9899513037c8b69827be79580779dde74dedaf8a43		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 6030 bytes
vbaProject_00.bin
a938af0bcc11a3ea0641f29182c9e29d8346b2ca7ed967160a83408002183fa0		 vba-project OOXML VBA project: ppt/kasdokaosdk.b 35328 bytes

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