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

Static analysis result for SHA-256 40c8a5e80fecc8b1…

MALICIOUS

Office (OLE) / .XLSX

175.0 KB Created: 2022-10-25 08:45:18 Authoring application: Microsoft Excel First seen: 2022-10-28
MD5: 7739c713ab24ab08e379a740a1b59214 SHA-1: 274dcef82734a6f93b5f098db068bd676c4c2220 SHA-256: 40c8a5e80fecc8b1d3aa93ec9fdcd95e92e52bdbff1dcec111db70aa670b27fb
462 Risk Score

Malware Insights

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

The sample contains VBA macros that trigger on opening the workbook, utilizing WScript.Shell and CreateObject to download and execute a file from the embedded URL. The ClamAV detection name 'Doc.Dropper.Agent-6412232-1' further supports its role as a dropper.

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/Ref77013962020.exe

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
332a12c8e08e170da63c03d41ce7f33f7896cb184b6a4f0bbe2d4aca73d3f3e9		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 68446 bytes

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