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

Static analysis result for SHA-256 f463b56f4024d7e2…

MALICIOUS

Office (OLE) / .XLS

59.5 KB Created: 2020-06-17 08:53:09 Authoring application: WPS Office
MD5: 69f4389280f64818e31a74c57a9500ec SHA-1: d785b93780a897114fc02d86ff5d32416f91b27b SHA-256: f463b56f4024d7e266a3123e5c544da238378fbb5e82277970bf3051d70e9fcf
268 Risk Score

Malware Insights

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

The XLS file contains a Workbook_Open VBA macro that utilizes the Shell() function. This indicates the macro is designed to execute an external command, likely to download and run a second-stage payload. The presence of 'macros.bas' further supports the macro-based execution. ClamAV identified this as Xls.Dropper.Agent, suggesting a dropper functionality.

Heuristics 7

  • Shell() call in VBA critical OLE_VBA_SHELL
    Shell() call in VBA
  • ClamAV: Xls.Dropper.Agent-8183867-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Xls.Dropper.Agent-8183867-0
  • Workbook_Open macro high OLE_VBA_WBOPEN
    Workbook_Open macro
  • 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
  • Environ() call (env variable access) low OLE_VBA_ENVIRON
    Environ() call (env variable access)

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
7da36935fd85ebce33d08373c579ffb9f457a1de00bac2731fe9fc0ac5a0a3b4		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 3205 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved macro source contains an auto-exec entry point and execution/download terms.

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