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

Static analysis result for SHA-256 e113acf5df0303c2…

MALICIOUS

Office (OLE) / .XLS

2.09 MB Created: 2025-08-07 20:13:42 Authoring application: Microsoft Excel First seen: 2026-02-27
MD5: b8f009ee52c99361c03488bca8a0c9b4 SHA-1: 23d26ef545dfc01d1a251aadd384bc65ee03d31e SHA-256: e113acf5df0303c2e1c59e52daee010c9a876f34811dbfecf21cba7f82ee12be
350 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1059.001 PowerShell T1204.002 Malicious File T1071.001 Web Protocols

The Workbook_Open macro is designed to execute code upon opening the Excel file. It utilizes WScript.Shell and the Shell() function, indicating an attempt to download and execute a payload from the embedded URL http://sbstorage.cfd/Chrome.js. The script's obfuscation and reliance on external resources suggest a downloader or droppper functionality.

Heuristics 10

  • Shell() call in VBA critical OLE_VBA_SHELL
    Shell() call in VBA
  • WScript.Shell usage critical OLE_VBA_WSCRIPT
    WScript.Shell usage
  • Reference to Windows Script Host high SC_STR_WSCRIPT
    Reference to Windows Script Host
  • 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.
  • Suspicious extracted artifact high EXTRACTED_FILE_STATIC_TRIAGE
    One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.
  • 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)
  • 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://sbstorage.cfd/Chrome.js

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
32a5548c61670dc7f4e6d06a49fde25095a016ee17441d9eb47c193daf4c3a4d		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 76832 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 2 shell/COM execution token(s). Carved artifact contains 8 Chr/ChrW string-construction calls. Carved macro source contains an auto-exec entry point and execution/download terms.

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