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

Static analysis result for SHA-256 b9e136a876d61f7c…

MALICIOUS

Office (OLE) / .XLS

114.0 KB Created: 2020-06-03 14:15:25 Authoring application: Microsoft Excel
MD5: 103956f35c51a30caee41b95c0628b27 SHA-1: 10c3edad7efdf92c6092d0c2407bc9a6152afb4c SHA-256: b9e136a876d61f7c3404b47669c84999635c1728d588391933e933b2e729e206
200 Risk Score

Malware Insights

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

The sample contains Excel 4.0 macros (OLE_XLM_AUTOOPEN) that leverage dangerous functions like RUN (OLE_XLM_DANGEROUS_FN). The macros utilize ShellExecuteA and URLDownloadToFileA (SC_STR_SHELLEXEC, SC_STR_URLDOWNLOAD) to download a file from the URL https://ogglededibl.at/3/dws.dll. The script also contains instructions to execute the downloaded file using regsvr32.exe or rundll32.exe, indicating a downloader or dropper functionality.

Heuristics 6

  • Reference to URLDownloadToFile API critical SC_STR_URLDOWNLOAD
    Reference to URLDownloadToFile API
  • Reference to ShellExecute API high SC_STR_SHELLEXEC
    Reference to ShellExecute API
  • XLM Auto_Open with dangerous formula APIs high OLE_XLM_DANGEROUS_FN
    Excel 4.0 macro sheet contains an Auto_Open / Auto_Close entry and dangerous XLM formula APIs that can invoke programs, write files, or transfer control without VBA.
  • Visible LOLBin command execution instruction high SE_LOLBIN_RUN_COMMAND
    Document contains instructions or visible command text involving Windows script/execution tools such as PowerShell, mshta, cmd, rundll32, or regsvr32
  • Excel 4.0 (XLM) macro sheet present medium OLE_XLM_AUTOOPEN
    Workbook contains an Excel 4.0 macro sheet sub-stream — XLM is rarely seen in modern legitimate workbooks and was a major Office malware vector during 2020-2022.
  • 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 https://ogglededibl.at/3/dws.dll

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
xlm_macros.txt
e207671c68c820466cb89d8a48eb9e00cd504428bcba4fbc4885d4325181e50f		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 31207 bytes

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