Emotet — Office (OLE) / .XLSX malware analysis

Static analysis result for SHA-256 4fa05f52ca62ee3c…

MALICIOUS

Office (OLE) / .XLSX

122.5 KB Created: 2022-02-09 09:48:26 Authoring application: Microsoft Excel
MD5: 479d13e49f3ecab07fc5e1e05c4b7571 SHA-1: 01f9ca8a279c4fafcc9ef8d88f3663ff15d88b47 SHA-256: 4fa05f52ca62ee3c8aee048cd1395082584d26de896f7292fdbcf9f8d61139f2
240 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 a macro-enabled Excel spreadsheet detected as Emotet by ClamAV. The Workbook_Open macro executes CreateObject, which is used to launch a batch file and a VBScript from the 'c:\programdata\' directory. The script also contains obfuscated URLs that are likely used to download additional payloads. The reconstructed URL 'http://midnighsilverbcrqfters.com/store/wBjNOUw/B710N4cA6R3/' is a high-priority IOC.

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
9cbf8713fe70bdb64aebf69283580fb373bf2b46fec663952a33deb3e3aab001		 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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