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

Static analysis result for SHA-256 5496dfc9455c74ff…

MALICIOUS

Office (OLE) / .XLS

208.0 KB Created: 2020-10-21 09:58:10 Authoring application: Microsoft Excel
MD5: a9dab55de2598906c3cf6ca1e8c2e17b SHA-1: 805f3996e81834229f72a22e6daee3c8fa47a5ca SHA-256: 5496dfc9455c74ff1ab9ecc70673029150fcf35e12922953627667a7b7b7f7a6
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 VBA macro that is triggered upon opening. This macro utilizes WScript.Shell and CreateObject to execute obfuscated code, as indicated by multiple high and critical heuristic firings. The presence of 'macros.bas' suggests a macro-based downloader. The embedded URL heuristic also indicates a potential download source, though the URL itself was not extracted.

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
fed3789b9ae5307c5da036a34d44872dcf998149a85b61e6d400302414c04249		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 37766 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 2 shell/COM execution token(s). Carved artifact contains 113 long base64-like blob(s). Carved macro source contains an auto-exec entry point and execution/download terms.

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