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

Static analysis result for SHA-256 f945161c3ba134c1…

MALICIOUS

Office (OLE) / .XLS

55.5 KB Created: 2018-12-06 20:43:11 Authoring application: Microsoft Excel
MD5: fcf8455b5da351650ed2e3c7d560d76e SHA-1: e8e8b2be3a8c6bcf4a875671c468eb1dae630111 SHA-256: f945161c3ba134c15554ef6dab1300ce6991e341d83bae157117072660533364
342 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1059.003 Windows Command Shell T1204.002 Malicious File

The sample is an Excel spreadsheet containing VBA macros, with a Workbook_Open macro specifically detected. The document body prompts the user to 'Enable content to display this payment receipt', a common lure for macro-enabled documents. The critical OLE_VBA_SHELL and OLE_VBA_WSCRIPT heuristics indicate the macro likely uses WScript.Shell to execute commands. The presence of a Workbook_Open macro that calls Shell() strongly suggests the intent is to download and execute a second-stage payload upon opening the document.

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
b82b9a9a3b3aba9b58226b95eec305e97b7a4aec72cc505aea53f9e24e404441		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 12949 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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