Emotet — Office (OLE) / .XLSX malware analysis

Static analysis result for SHA-256 a47883f45aa7f1d7…

MALICIOUS

Office (OLE) / .XLSX

122.5 KB Created: 2022-02-09 09:48:26 Authoring application: Microsoft Excel
MD5: 71de37d7e70ae1bf759fb3f585452f00 SHA-1: 1210863ae430d90039b1a00e1d33ae1010ec91ea SHA-256: a47883f45aa7f1d77d69ef000236c2fc7322de49622ff018b9d3c444f0f1d2f5
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 sample is an Excel file containing VBA macros, specifically a Workbook_Open auto-execution macro. This macro utilizes CreateObject to execute commands, including the creation of a VBS file ('oue4hjld.vbs') and a batch file ('bhnasleil.bat') in the 'C:\ProgramData' directory. The script also attempts to download a payload from multiple URLs, including 'http://midnighsilverbircrafter.com/store/wBjNOUwc/BI710N4cQ6R3/' and 'http://temp.com/NAT_05_22_2009/BI710N4cQ6R3/', and a partial URL 'https://redington.karmat'. This behavior is characteristic of Emotet, which often uses macro-enabled documents to download and execute further stages of malware.

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
702ef41c40300b6210e36971a7272cab2069f7a98ce9093512c5f48499ec6eb4		 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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