Emotet — Office (OLE) / .XLSX malware analysis

Static analysis result for SHA-256 f440eca3c25cc871…

MALICIOUS

Office (OLE) / .XLSX

138.0 KB Created: 2022-02-09 09:48:26 Authoring application: Microsoft Excel
MD5: ae7912aaa914eada704bf61da86d90b8 SHA-1: 00c9fa111009ea7f2a82b0b17c123926fa80f087 SHA-256: f440eca3c25cc871dea1eea0586c197bbb491bd7099d4fb8322d4d35a40c443a
240 Risk Score

Malware Insights

Emotet · confidence 95%

MITRE ATT&CK
T1059.001 PowerShell T1566.002 Spearphishing Attachment T1059.005 Visual Basic

The sample is a macro-enabled Excel file detected as Emotet by ClamAV. The Workbook_Open macro is configured to execute a VBScript payload. The script attempts to download a second-stage payload from multiple URLs, including 'http://midnighsilverbircraft.com/store/wBjNOUwc/B710N4cA6R3/' and 'https://redington.karmat', and save it as 'oue4hjld.vbs' in the 'C:\programdata\' directory. It also creates a batch file 'bhnasleil.bat' in the same directory. The script's obfuscated nature and its payload delivery mechanism are characteristic of Emotet.

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
826a00a2df84b6dac9a0f4bce667e7e792a9ce1d7c83ebeb3d0b1a53f11eb0d5		 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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