Emotet — Office (OLE) / .XLSX malware analysis

Static analysis result for SHA-256 841d1970ec5dab93…

MALICIOUS

Office (OLE) / .XLSX

142.5 KB Created: 2006-09-28 05:33:49 Authoring application: Microsoft Excel
MD5: f3e20eb34335d0384f53cc6121cb3cd9 SHA-1: 0fa68aa99a47a501e7061297acd5db736fc3d4d9 SHA-256: 841d1970ec5dab930d6a7b8dae81a9657423fcfd1a0e6761eea3cb331eff5a8f
280 Risk Score

Malware Insights

Emotet · confidence 95%

MITRE ATT&CK
T1059.005 Visual Basic T1059.001 PowerShell T1204.002 Malicious File

The file is identified as malicious by ClamAV with the signature 'Doc.Downloader.EmotetExcel02226-9938630-0', strongly suggesting the Emotet family. The presence of a Workbook_Open macro and CreateObject calls indicates that the VBA code executes automatically upon opening the document. The script attempts to download and execute a second-stage payload from a series of concatenated URLs, including 'http://rkepreua.com/inclube/FBXbsVAOd1DU/', and writes a batch file to 'c:\programdata\rtyusdj.bat'.

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
ffa342a8bb4eb541fe833e6254cf3f6e2f7d6f5436c011440a061030b6684f64		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 6473 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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