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

Static analysis result for SHA-256 16c5cbeda4b5dfad…

MALICIOUS

Office (OLE) / .XLS

94.0 KB Created: 2020-11-24 06:24:27 Authoring application: Microsoft Excel
MD5: f1499493e9edeeffc248d6932d7a4c03 SHA-1: c167f4d73808f899c8228d7fb0669efe2b8a775e SHA-256: 16c5cbeda4b5dfad0058c5ade0284c0d02b3dd9f4145306600d991fd1d2dd157
502 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1204.002 Malicious File T1105 Ingress Tool Transfer

This XLS file contains a Workbook_Open VBA macro that uses WScript.Shell to create an object and access the user's Templates folder. The macro is designed to download and execute a second-stage payload, as indicated by the 'OLE_VBA_HTTP_DROP_EXEC' and 'OLE_VBA_OBFUSCATED_AUTOEXEC_LOADER' heuristics. The document body's instruction to 'Habilite el contenido' (Enable content) is a common lure to bypass macro security.

Heuristics 12

  • 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.
  • Obfuscated auto-exec VBA loader critical OLE_VBA_OBFUSCATED_AUTOEXEC_LOADER
    Auto-exec VBA reconstructs strings with a heavy custom decoder (numeric char-array, repeated hex-string decode, or junk-token Replace removal) and feeds them to a COM-instantiation or execution sink. This obfuscated-loader shape keeps CreateObject/Shell/URL indicators out of the macro source.
  • ClamAV: Xls.Macro.Obfuscation-9804250-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Xls.Macro.Obfuscation-9804250-0
  • 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
  • Suspicious extracted artifact info 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.

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
e3845d1877607bdcafa17a4955104afb0448b1619ecb6b13e5a4673e96960c90		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 40406 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 129 long base64-like blob(s).

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