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

Static analysis result for SHA-256 d4c6fb5a000c387f…

MALICIOUS

Office (OLE) / .XLS

255.0 KB Created: 2019-05-10 07:57:09 Authoring application: Microsoft Excel
MD5: 6b999100f6b93bbbb4499c90f12714a9 SHA-1: 3fe568c2aff719b7da6868c81d82e8353750967e SHA-256: d4c6fb5a000c387f83daaba5c208720fe6d367def5da93aa50235c86ff41f158
388 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1059.003 Windows Command Shell

This XLS file contains a Workbook_Open VBA macro that utilizes WScript.Shell and CreateObject to execute arbitrary commands. The presence of SC_STR_WSCRIPT and OLE_VBA_SHELL heuristics strongly indicates that the macro is designed to download and execute a secondary payload. The macro's auto-execution upon opening, combined with the shell execution, points to a downloader or droppper attack pattern.

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
  • GetObject call high OLE_VBA_GETOBJ
    GetObject 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)

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
c0e0225321aa12fc0ecf862f19c2d091e6dc10ac24c13cbefc58c6ab20068e07		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 120977 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 shell/COM execution token(s). Carved artifact contains 1 eval/decoder/string-building token(s). Carved macro source contains an auto-exec entry point and execution/download terms.

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