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

Static analysis result for SHA-256 6e6d4e37d64dd0ad…

MALICIOUS

Office (OLE) / .XLS

301.5 KB Created: 2018-12-06 20:43:11 Authoring application: Microsoft Excel
MD5: a01706a0f31dda40a2f8ad4e6465fa0f SHA-1: 1607d828edc5e3e06c48bfb5b01c7169c8e93722 SHA-256: 6e6d4e37d64dd0ad9e1e0deb2818557eac36d5794f2f786455332c3b9699c8ae
370 Risk Score

Malware Insights

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

The Excel file contains VBA macros, including a Workbook_Open event, which are designed to execute automatically. The macros utilize WScript.Shell and CreateObject to download a file from a URL (reconstructed as AppData\macros.bas) and execute it, indicating a downloader or dropper functionality.

Heuristics 10

  • 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.
  • 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
  • Environ() call (env variable access) low OLE_VBA_ENVIRON
    Environ() call (env variable access)
  • 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
cdbeace9c11fe1a9af98312b2aba050a35a4d0da625c4cd300464a67bced55cb		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 42722 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 18 long base64-like blob(s).

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