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

Static analysis result for SHA-256 9f01f8460d60590d…

MALICIOUS

Office (OLE) / .XLSX

307.5 KB Created: 2015-06-05 18:17:20 Authoring application: Microsoft Excel First seen: 2023-05-25
MD5: fdee229dfb02edb91fabd190f07ac0eb SHA-1: a3bd6444f252524310ab376ddac774ca60d86f22 SHA-256: 9f01f8460d60590d2e4e5f7636e1e0a7f6f2cc5e37510b747a598ca24533ba7c
282 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Service Execution: Service Execution T1059.003 Command and Scripting Interpreter: Windows Command Shell T1204.002 Malicious File Execution: Malicious File

The Excel file contains a Workbook_Open VBA macro that writes content to a VBScript file named 'socalled.vbs' and then executes it using 'wscript'. This indicates a downloader or dropper functionality, aiming to fetch and run a secondary payload. The presence of Shell() calls and references to PowerShell and WScript strongly suggest malicious execution intent.

Heuristics 8

  • Shell() call in VBA critical OLE_VBA_SHELL
    Shell() call in VBA
  • Reference to PowerShell high SC_STR_POWERSHELL
    Reference to PowerShell
  • Reference to Windows Script Host high SC_STR_WSCRIPT
    Reference to Windows Script Host
  • Workbook_Open macro high OLE_VBA_WBOPEN
    Workbook_Open macro
  • 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.
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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 https://bitbucket.org/mounmeinlylo/rikirollin/downloads/johnftp.pif

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
9ee91c602ac016755bca9c1d76fa0e7ae5e5fa9e20efb4861b8d9cd9f8912a96		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 2104 bytes

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