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

Static analysis result for SHA-256 6cec1f390f674cb7…

MALICIOUS

Office (OLE) / .XLS

60.5 KB Created: 2018-12-06 20:43:11 Authoring application: Microsoft Excel
MD5: b599ebf4acf3f137ea8818e3d8e33250 SHA-1: c96df6824d877a8c29b865bf492868b66e36fc4d SHA-256: 6cec1f390f674cb7808f727c4c1e147cc35728aada372e22a72a1a2a75c1c982
380 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1203 Exploitation for Client Execution T1105 Ingress Tool Transfer

The critical heuristics indicate the presence of a Workbook_Open VBA macro that utilizes WScript.Shell to download and execute a payload. The obfuscated script content, though truncated, strongly suggests this malicious behavior. The document body's instruction to 'Habilitar el contenido' (Enable content) serves as a lure to bypass security measures.

Heuristics 9

  • Shell() call in VBA critical OLE_VBA_SHELL
    Shell() call in VBA
  • WScript.Shell usage critical OLE_VBA_WSCRIPT
    WScript.Shell usage
  • VBA downloads and writes a file to disk critical OLE_VBA_HTTP_DROP_EXEC
    VBA reads an HTTP response body and writes it to disk (ADODB.Stream SaveToFile). Combined with the auto-exec/Shell paths this is a download-drop dropper even when the COM ProgIDs are built dynamically to evade keyword scanning.
  • 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.
  • 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
bcdbc1647d941a0b3fce4615bd8f81d2ec7c45144c2168d1926bbf9d700ae764		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 13187 bytes

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