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

Static analysis result for SHA-256 eaa14ff5cdf3ec42…

MALICIOUS

Office (OLE) / .XLS

215.0 KB Created: 2021-01-10 22:05:10 Authoring application: Microsoft Excel
MD5: d5185ca33c490e907fc4fa6b22558890 SHA-1: 151f729d65c4241ccde8e7055b57d1176d29198d SHA-256: eaa14ff5cdf3ec428bd1b0c2689272996741a4c93f3c1289934057c3c5cafc78
400 Risk Score

Malware Insights

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

The XLS file contains a Workbook_Open macro that utilizes WScript.Shell and CreateObject, indicating an attempt to execute arbitrary code. The presence of obfuscated VBA code and a critical heuristic for Shell() calls strongly suggests the macro is designed to download and execute a secondary payload. The ClamAV detection further supports its malicious nature.

Heuristics 9

  • Shell() call in VBA critical OLE_VBA_SHELL
    Shell() call in VBA
  • WScript.Shell usage critical OLE_VBA_WSCRIPT
    WScript.Shell usage
  • 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.
  • 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
528ece74ece18a819ec94bd42be8e3ddeef2b96ab0983f89120362cdd30ed190		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 98129 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 shell/COM execution token(s). Carved artifact contains 69 long base64-like blob(s). Carved macro source contains an auto-exec entry point and execution/download terms.

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