Emotet — Office (OLE) / .XLS malware analysis

Static analysis result for SHA-256 817f5336a81c5f8b…

MALICIOUS

Office (OLE) / .XLS

150.5 KB Created: 2015-06-05 18:17:20 Authoring application: Microsoft Excel
MD5: 44761b11083ec66d6254fcc6ba6e5052 SHA-1: af02f661dcc58d404879999b34640a37c9c0cf16 SHA-256: 817f5336a81c5f8b410e5e70fe7bd3577833ecf2aabcf9b586fac2dc4e0412be
280 Risk Score

Malware Insights

Emotet · confidence 95%

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

The file is detected as malicious by ClamAV with the signature 'Doc.Downloader.EmotetExcel02226-9938630-0', indicating it's a known Emotet downloader. The Workbook_Open macro is present and configured to execute code, which includes a CreateObject call to 'Wscript.Shell'. This script attempts to create a batch file at 'c:\programdata\jledshf.bat' and then execute it. The batch file content is heavily obfuscated but appears to be designed to download and execute further payloads from multiple URLs. The presence of 'Wscript.Shell' and the auto-execution of a macro strongly suggest a downloader functionality.

Heuristics 7

  • ClamAV: Doc.Downloader.EmotetExcel02226-9938630-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Downloader.EmotetExcel02226-9938630-0
  • 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
006c4f4d54d1c9bb906763adb0bd849cdbbe9d88f3fa78ad2d18ef6987f96c37		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 8906 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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