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

Static analysis result for SHA-256 c6988a749fdc0670…

MALICIOUS

Office (OLE) / .XLS

286.5 KB Created: 2018-12-06 20:43:11 Authoring application: Microsoft Excel
MD5: a222f2ed1ce5e5297cd18d23a3ea780b SHA-1: 0d551b146629ebc72649e7800c7fbd4f85e42726 SHA-256: c6988a749fdc067052a42f5032bd099f02a625dd96997bc57c255eb5ffee7069
340 Risk Score

Malware Insights

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

The file is an Excel spreadsheet containing VBA macros. The Workbook_Open macro is present and utilizes WScript.Shell to execute arbitrary commands. This indicates the sample is designed to download and execute a second-stage payload. No specific family could be identified, but the technique is common for initial access.

Heuristics 8

  • 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

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
36c36c0cc0d59eadba6f95c680936bd0bc233831237b7e623431cd574875691a		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 12545 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 shell/COM execution token(s). Carved macro source contains an auto-exec entry point and execution/download terms.

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