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

Static analysis result for SHA-256 dd5e879363900f6f…

MALICIOUS

Office (OLE) / .XLS

343.0 KB Created: 2018-12-06 20:43:11 Authoring application: Microsoft Excel
MD5: b5bc2cd366aef3ceea05aef732a2daa9 SHA-1: 1041e988b9c4045bd565221072bc18bc488cebca SHA-256: dd5e879363900f6fb165bc02d131c844183d8b2061ed473a5f33b5984a7cb206
340 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1059.003 Windows Command Shell T1218 Signed Binary Proxy Execution

The Excel file contains VBA macros, specifically a Workbook_Open subroutine, which is a common technique for initial execution. The script utilizes `CreateObject("WScript.Shell")` and `WScript.Shell` to interact with the system, likely to download and execute further payloads or establish persistence. The presence of `Shell()` calls and `WScript.Shell` usage strongly indicates malicious intent, although the exact payload is not fully discernible from the provided snippet.

Heuristics 8

  • 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

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
087d23fb5d4ced3cc7aef929749cebcca1627edf6b724835172c2941e5acb5dd		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 10691 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 shell/COM execution token(s). Carved macro source contains an auto-exec entry point and execution/download terms.

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