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

Static analysis result for SHA-256 c7042abbb28ecd4c…

MALICIOUS

Office (OLE) / .XLS

171.5 KB Created: 2018-12-06 20:43:11 Authoring application: Microsoft Excel
MD5: 97f44812ae718297224f44dbfa7b40fb SHA-1: c647231c75e310ce07ac44024cdf71aa314db5ca SHA-256: c7042abbb28ecd4c08425162570e459bf03aa0a2dc0e23a04024a5ec78a2052b
348 Risk Score

Malware Insights

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

This XLS file contains VBA macros that are automatically executed upon opening, as indicated by the Workbook_Open heuristic. The script utilizes WScript.Shell to execute commands, a common technique for downloading and running further malicious payloads. The obfuscated nature of the script and the presence of a long encoded blob suggest a downloader or droppper functionality.

Heuristics 9

  • Shell() call in VBA critical OLE_VBA_SHELL
    Shell() call in VBA
  • WScript.Shell usage critical OLE_VBA_WSCRIPT
    WScript.Shell usage
  • 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
  • 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
893a15352ac8e1a671d63c455f24d5a723a50466bbcd07726ede70cc6a832b58		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 24183 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 shell/COM execution token(s). Carved artifact contains 3 long base64-like blob(s). Carved macro source contains an auto-exec entry point and execution/download terms.

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