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

Static analysis result for SHA-256 2983de32f64ddd24…

MALICIOUS

Office (OLE) / .XLS

118.0 KB Created: 2018-12-06 20:43:11 Authoring application: Microsoft Excel
MD5: f02a4a7ed56a2150fb68a369ffe1f53b SHA-1: 86a9da461c8764eed23c957690a7ebe1ba2ea74f SHA-256: 2983de32f64ddd243cfef3b4efa51de6c3a9565de211d51551fdb1d7e6a81aba
340 Risk Score

Malware Insights

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

The sample is an Excel file containing VBA macros, specifically a Workbook_Open macro that utilizes Shell() and WScript.Shell. This indicates the macro is designed to execute commands or scripts upon opening the workbook after the user enables content. The presence of these critical heuristics strongly suggests a malicious downloader or dropper.

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
fb0c870d79e9d77eaa4760968d72b11dec1d9597cabc186ed75b426965ce6208		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 27055 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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