Malicious Office (OLE) / .XLSX — malware analysis report

Static analysis result for SHA-256 d86628ed9c58fadc…

MALICIOUS

Office (OLE) / .XLSX

233.0 KB Created: 2022-10-26 07:46:34 Authoring application: Microsoft Excel First seen: 2022-10-26
MD5: 4e2e5429ef978cde8873d5354606cf77 SHA-1: 39d1d9c8416380c967c7eda4de6ddc5cf2a5c8f4 SHA-256: d86628ed9c58fadce80cac836d949eb6dac45d1671a76d77ed4d39fe5db93bd8
462 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1059.001 PowerShell T1105 Ingress Tool Transfer T1204.002 Malicious File T1071.001 Web Protocols

The critical heuristic OLE_VBA_HTTP_DROP_EXEC indicates that the VBA macros download a file from an embedded URL and save it to disk. The AutoOpen and Workbook_Open macros, along with the critical heuristic OLE_VBA_SHELL, suggest that this downloaded file is then executed. The embedded URL http://oslobikerental.no.ww18.online4u.no/wp-includes/ID2/ups/Ref671005018.exe is highly suspicious and likely serves as the distribution point for the second-stage payload.

Heuristics 11

  • Shell() call in VBA critical OLE_VBA_SHELL
    Shell() call in VBA
  • WScript.Shell usage critical OLE_VBA_WSCRIPT
    WScript.Shell usage
  • VBA downloads and writes a file to disk critical OLE_VBA_HTTP_DROP_EXEC
    VBA reads an HTTP response body and writes it to disk (ADODB.Stream SaveToFile). Combined with the auto-exec/Shell paths this is a download-drop dropper even when the COM ProgIDs are built dynamically to evade keyword scanning.
  • ClamAV: Doc.Dropper.Agent-6412232-1 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Dropper.Agent-6412232-1
  • Reference to Windows Script Host high SC_STR_WSCRIPT
    Reference to Windows Script Host
  • AutoOpen macro high OLE_VBA_AUTOOPEN
    AutoOpen macro
  • 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 macros detected medium OLE_VBA_MACROS
    Document contains VBA macro code
  • 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://oslobikerental.no.ww18.online4u.no/wp-includes/ID2/ups/Ref671005018.exe

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
8af5c05c45cb8c49da5ffb6d0a15d43fcb6260760e1a96d71534414cc20a28d9		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 100889 bytes

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