Emotet — Office (OLE) / .XLSX malware analysis

Static analysis result for SHA-256 8ed82a20bcdb8359…

MALICIOUS

Office (OLE) / .XLSX

138.0 KB Created: 2022-02-09 09:48:26 Authoring application: Microsoft Excel
MD5: 46c55675d0431bbef5c09a051f7ceda1 SHA-1: 62313faa284395487af303fb05aa8544cf8aa396 SHA-256: 8ed82a20bcdb8359eca103bb234a9b7825cfbad3c5fa0d5733c015feeeacdc18
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 a malicious Excel document containing VBA macros. The Workbook_Open event is triggered, which uses CreateObject to execute a series of commands. These commands appear to download and execute malicious VBS and BAT files from the provided URLs, specifically 'c:\programdata\oue4hjld.vbs' and 'c:\programdata\bhnasleil.bat'. The script also attempts to reconstruct a URL from concatenated strings, resulting in 'https://redington.karmart'. The ClamAV detection name 'Doc.Downloader.EmotetRed02220-9938909-0' strongly suggests the Emotet family.

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
3f1edc3bb6a298ed82aefbbcb8f14a1ec3e5e085cb8378b76f3a110e08afd58f		 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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