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

Static analysis result for SHA-256 0bfadeef96fbf4f8…

MALICIOUS

Office (OLE) / .XLS

105.0 KB Created: 2021-04-13 13:37:17 Authoring application: Microsoft Excel
MD5: b094f814b4022b4696dff0446e320bd3 SHA-1: 0fa6f501b9e49ad268507c74bc38c0fc86198f52 SHA-256: 0bfadeef96fbf4f8f8cac525375a6e83c3f34abb2d3e869c99c4ee09ab2332bb
142 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1204.002 Malicious File

The Workbook_Open VBA macro executes a PowerShell command to download a second-stage executable from the hardcoded URL http://209.141.61.124/Q-2/ConsoleApp9.ex and save it as C:\Users\Public\Documents\ontoneed.ex. The script then immediately executes the downloaded file. This indicates a downloader or droppper functionality.

Heuristics 5

  • 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://209.141.61.124/Q-2/ConsoleApp9.ex

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
987c4404fc4afd6604cd40b35f4bb230e061417002c4f5a9c7e3f6a985b3e7df		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 1254 bytes

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