Emotet — Office (OLE) / .XLSX malware analysis

Static analysis result for SHA-256 5946f1a3b9b2b05c…

MALICIOUS

Office (OLE) / .XLSX

122.5 KB Created: 2022-02-09 09:48:26 Authoring application: Microsoft Excel
MD5: ce3cceee2ce6cf7e5ccba9064c5d5d4d SHA-1: eae8a4e5e69711dd52eb3966540404d6e708cfaa SHA-256: 5946f1a3b9b2b05caa543b0145a0ad8a6ee0e7e915437224a4834f52db739a93
240 Risk Score

Malware Insights

Emotet · confidence 95%

MITRE ATT&CK
T1059.005 Visual Basic T1059.001 PowerShell T1105 Ingress Tool Transfer

The critical ClamAV detection and high-severity heuristics for Workbook_Open and CreateObject indicate a malicious macro downloader. The VBA script attempts to download and execute a second-stage payload from multiple URLs, including 'http://midnighthilivercrafters.com/store/wBjNOUwc/BI710N4cQA6R3/' and 'http://tempra.com/NAT_E_05_22_2009/BI710N4cQA6R3/', and saves it as 'c:\programdata\oue4hjld.vbs'. The script also appears to prepare a batch file 'c:\programdata\bhnasleil.bat' for execution.

Heuristics 6

  • ClamAV: Xls.Downloader.Emotet-ab81c42b2bd4747e-9951196-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Xls.Downloader.Emotet-ab81c42b2bd4747e-9951196-0
  • 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
1b8fdc5c87890c3844153962bfa5891b79b4222e19ba37ddc78b566515d1c71a		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 52433 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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