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

Static analysis result for SHA-256 f1f5ca357c3c67ee…

MALICIOUS

Office (OLE) / .XLS

62.5 KB Created: 2018-12-06 20:43:11 Authoring application: Microsoft Excel
MD5: 634eda2ed35505b3af4dcc9fd537a009 SHA-1: 0d78d766baaf10a9c2be65e058ac26dad61d6e69 SHA-256: f1f5ca357c3c67ee391971f3dee3136ca140f5d0e905237837427d4bd287e797
360 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1059.003 Windows Command Shell T1204.002 Malicious File

The sample is a Microsoft Excel file containing a Workbook_Open VBA macro. This macro utilizes WScript.Shell and CreateObject to execute commands, likely to download and run a second-stage payload. The document body explicitly instructs the user to 'Enable Content', a common social engineering tactic to bypass macro security. The presence of WScript.Shell and Shell() calls strongly indicates execution of arbitrary code.

Heuristics 9

  • 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
  • Macro/content-enable lure medium SE_ENABLE_LURE
    Document instructs the user to enable macros or editing — a common technique used by malware droppers to bypass Office macro security settings

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
11276dab8997acbe1130fcf9cf97d7bd45b33f9e512f85f8ce0abaab2667c31c		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 25953 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 2 shell/COM execution token(s). Carved macro source contains an auto-exec entry point and execution/download terms.

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