Emotet — Office (OLE) / .XLSX malware analysis

Static analysis result for SHA-256 42d370d12bea3eed…

MALICIOUS

Office (OLE) / .XLSX

150.5 KB Created: 2015-06-05 18:17:20 Authoring application: Microsoft Excel
MD5: c77dfc0f5356a69fc5fbbb52a80ba65e SHA-1: 5f7d14e00740f486646ac281c0f3ec18da08d304 SHA-256: 42d370d12bea3eed279a330e63e75a0d34f133c8bb2388c92b9b65e8094bf691
280 Risk Score

Malware Insights

Emotet · confidence 95%

MITRE ATT&CK
T1059.001 PowerShell T1059.003 Windows Command Shell T1204.002 Malicious File T1566.001 Spearphishing Attachment T1105 Ingress Tool Transfer

The sample is identified as malicious by ClamAV with the signature Doc.Downloader.EmotetExcel02226-9938630-0. Static analysis reveals a Workbook_Open VBA macro that uses Wscript.Shell to create and execute a batch file located at 'c:\programdata\jledshf.bat'. This batch file contains obfuscated commands that appear to download and execute further payloads from multiple URLs. The VBA macro's logic for obfuscating the download URLs and the overall behavior strongly suggests the Emotet family.

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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