Emotet — Office (OLE) / .XLSX malware analysis

Static analysis result for SHA-256 3f42d81283b31cd7…

MALICIOUS

Office (OLE) / .XLSX

138.0 KB Created: 2022-02-09 09:48:26 Authoring application: Microsoft Excel
MD5: d6388570b64373e983fe508c0cad9778 SHA-1: a65f205996f8669d03a7e729e799f53d9827cdee SHA-256: 3f42d81283b31cd7081599bbbd01b4e910297dc28381bebf25afe4b2cbc6ae23
240 Risk Score

Malware Insights

Emotet · confidence 95%

MITRE ATT&CK
T1059.001 PowerShell T1059.005 Visual Basic T1204.002 Malicious File T1105 Ingress Tool Transfer

The critical ClamAV detection and high-severity heuristics for VBA macros, specifically a Workbook_Open auto-execution, indicate malicious intent. The script attempts to download and execute payloads from multiple URLs, including 'http://midnighitsilverbcrqafters.com/store/wBjNOUwc/B710N4cA6R3/' and 'http://temp.com/NAT_05_22_2009/BI710N4cA6R3/', and writes batch and VBScript files to 'c:\programdata\oue4hjld.vbs' and 'c:\programdata\bhnasleil.bat'. This behavior is characteristic of Emotet's downloader functionality.

Heuristics 6

  • ClamAV: Doc.Downloader.EmotetRed02220-9938909-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Downloader.EmotetRed02220-9938909-0
  • 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
45106f01598f8daf98dede3fcc5eba043da23660dc9a18f85a14041bb9d30fd8		 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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