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

Static analysis result for SHA-256 f3e03741b8aa6cf7…

MALICIOUS

Office (OLE) / .XLS

52.0 KB Created: 2022-11-08 07:25:35 Authoring application: Microsoft Excel First seen: 2022-11-08
MD5: 04f77a9c6aca730e89556f062884c9cb SHA-1: dedf3d1194ab7cd98927500f8c7f6aa4f2beba85 SHA-256: f3e03741b8aa6cf7bbd6c9b9be448a82929b6e46a73774c318ca589e3f160573
288 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1059.001 PowerShell T1105 Ingress Tool Transfer

The sample is an Excel file containing VBA macros that utilize WScript.Shell and CreateObject to download a payload. The `cominciarono` function appears to construct a URL using obfuscated strings and then fetches content from it. This indicates a downloader functionality, likely fetching a second-stage payload.

Heuristics 7

  • Shell() call in VBA critical OLE_VBA_SHELL
    Shell() call in VBA
  • WScript.Shell usage critical OLE_VBA_WSCRIPT
    WScript.Shell usage
  • ClamAV: Xls.Downloader.d795e45a60a593c6-9978800-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Xls.Downloader.d795e45a60a593c6-9978800-0
  • Reference to Windows Script Host high SC_STR_WSCRIPT
    Reference to Windows Script Host
  • CreateObject call high OLE_VBA_CREATEOBJ
    CreateObject call
  • VBA macros detected medium OLE_VBA_MACROS
    Document contains VBA macro code
  • Environ() call (env variable access) low OLE_VBA_ENVIRON
    Environ() call (env variable access)

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
c1ff1a2d1054fe1a8a113d6651c29552579fbbc7bd21d2b7c911c234757d5943		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 3839 bytes

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